TECHNICAL SPECIFICATION VOLUME II CONTENTS

"Planning design construction of Bio-Safety -2+ (BSL-2+) laboratory , at IITB within IITB Campus Powai . Mumbai-400076

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TECHNICAL SPECIFICATION

1

SIGNATURE & SEAL OF TENDERER


VOLUME – II

CONTENTS


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TECHNICAL SPECIFICATIONS

GENERAL

i. The detailed specifications given hereinafter are for the items of works

described in the schedule of quantities attached herein & shall be

guidance for proper execution of work to the required standards.

ii. It may also be noted that the specification are of generalized nature &

these shall be read in conjunction with the description of item in schedule

of quantities & drawings. The work also includes all minor details of

construction which are obviously & fairly intended & which may not have

been referred to in these documents but are essential for the entire

iii. +completion in accordance with standard Engineering practice.

iv. Unless specifically otherwise mentioned, all the applicable codes &

standards published by the Indian standard Institution & all other standard

which may be published by them before the date of receipt of tenders,

shall govern in all respects of dosing workmanship quality & propitious of

materials & methods of testing, method of measurements etc. Wherever

any reference to any Indian Standard specifications occurs in the

documents relating to this contract, the same shall be inclusive of all

amendments issued to or revisions thereof, if any, up to the date of receipt

of tenders.

v. In case there is no I.S.I specification for the particular work, such work

shall be carried out in accordance with the instructions in all respects, &

requirements of the Engineers-in-Charge. Wherever any reference to any

Indian standard specification occurs in the documents relating to this

contract, the same shall be inclusive of all amendment issued there to or

revisions thereof, if any, up to the date of receipt of tenders.

vi. The work shall be carried out in a manner complying in all respects with

the requirements of relevant bye-laws of the Municipal

Committee/Municipal Corporation/Development Authority/Improvement

Trust under the jurisdiction of which the work is to be executed or as

directed by the Engineer-in-Charge and, unless otherwise mentioned,

nothing extra shall be paid on this account.

vii. Samples of various materials, fitting etc. proposed to be incorporated in

the work shall be submitted by the contractor for approval of the


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Engineers-in-Charge before order for bulk supply is placed.

viii. The contractor shall take instructions from the Engineer-in-Charge

regarding collection and stacking of materials in any place. No excavated

earth or building materials shall be stacked on areas where other

buildings, roads, services, compound walls etc. are to be constructed.

ix. The contractor shall maintain in perfect condition all works executed till the

completion of the entire work allotted to him. Where phased delivery is

contemplated, this provision shall apply to each Phase.

x. The contractor shall give a performance test of the entire installation(s) as

per standard specifications before the work is finally accepted & nothing

extra whatsoever shall be payable to the contractor for the test.

xi. The contractor shall clear the site thoroughly of all scaffolding materials &

rubbish etc. left out of his work & dress the site around the building to the

satisfactions & his decision in writing shall be final & binding on all

concerned.

xii. Post construction inspection and testing: After completion of the work

and during maintenance period liability of the contractor, the work shall

also be subjected to 'Post construction inspection and testing'. In case the

materials or articles incorporated in the work are found to be inferior,

though the sample collected for the same might have been passed at the

time of execution, it shall be the responsibility of the contractor to replace

the same at his own cost, failing which the Department may rectify the

same at the risk and cost of the contractor or Department may accept the

work as sub-standard, and cost be adjusted from the outstanding security

deposit, as per the terms and conditions of the contract for the work.

xiii. The Dean (I.P.S.), shall be the sole deciding authority as to the meaning,

interpretations and implications for various provisions of the specifications

and his decision in writing shall be final and binding on all concerned.

xiv. In case any different or discrepancy between the specification & the

description in the schedule of quantities, the schedule of quantities shall

take precedence. In case of any difference or discrepancy between

specification & drawing, the specification shall take precedence.


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12. STRUCTURAL STEEL :

12.1 SCOPE OF WORK :

The work covered by this specification consists of furnishing and erecting of

structural steel complete in strict accordance with this specifications and the

applicable drawings.

12.2 MATERIALS :

12.2.1 All structural steel shall be of standard sections as marked on the

drawings and shall be free of scale, blisters, laminations, cracked edges

and defects of any sort. If the structural steel is not supplied by the

Department and the Contractor is required to bring such steel, the Contractor

shall furnish duplicate copies of all mill orders and/ or also the test report

received from the mills, to satisfy the Engineer-in-Charge.

12.2.2 All structural steel and electrodes shall comply in all respects with

I.S.S. for structural steel.

12.3 WORKMANSHIP :

All workmanship shall be of first class quality in every respect to the greatest

accuracy being observed to ensure that all parts will fit together properly on

erection.

All ends shall be cut true to planes. They must fit the abutting surfaces closely.

All stiffeners shall be fit tightly at both ends.

All butt ends of compression members shall be in close contact through the

area of the joints.

All holes in plates and section between 12 mm. and 20 mm. thick shall be

punched to such diameter that 3 mm. of metal is left all around the hole to be

cleaned out to correct size by reamer.

The base connection shall be provided as shown on drawings and the greatest

accuracy of workmanship shall be ensured to provide the best connections.

Figured dimensions on the drawings shall be taken.

12.4 ERECTION AND MARKING :

Erection and fabrication shall be according to I.S. 800-1984 section-11. During

erection, the work shall be securely braced and fastened temporarily to provide


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safety for all erection stresses etc. No permanent welding shall be done until

proper alignment has been obtained.

Any part which do not fit accurately or which are not in accordance with the

drawings and specifications shall be liable to rejection and if rejected, shall be at

once be made good.

Engineer-in-Charge shall have full liberty at all reasonable times to enter the

contractors premises for the purpose of inspecting the work and no work shall be

taken down, painted or despatched until it has been inspected and passed. The

contractor shall supply free of charge all labour and tools required for testing of

work.

12.5 DELIVERY AT SITE :

The contractor shall deliver the component parts of the steel work in an

undamaged state at the site of the works and the Engineer-in-Charge shall be

entitled to refuse acceptance of any portion which has been bent or other wise

damaged before actual delivery on work.

12.6 SHOP DRAWINGS :

The shop drawings of structural steel based on contract drawings shall be

submitted to the Engineer-in-Charge. The necessary information for fabrication,

erection, painting of structure etc. must be furnished immediately after

acceptance of the tender.

12.7 PAINTING :

Painting should be strictly according to I.S. 1477-1971 (PartI-Pretreatment) and

I.S. 1477-1 971 (Part II-painting).

Painting should be carried out on dry surfaces free from dust, scale etc. The

paint shall be approved by the Engineer-in-Charge.

One coat of shop paint (red lead) shall be applied on steel, except where it is to

be encased in concrete or where surfaces are to be field welded.

12.8 WELDING :

Welding shall be in accordance with I.S. 816-1969, I.S. 819-1957, I.S. 1024-

1979, I.S. 1261-1959, I.S. 1323-1982 and I.S. 9595-1980 as appropriate. For

welding of any particular type of joint, welders shall give evidence of having

satisfactory completed appropriate tests as described in any of I.S. 817-1966,


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I.S. 1393-1961, I.S. 7307 (Part-I)-1 974, I.S. 7310 (Part-I)-1974 and I.S. 7318

(Part-I)-1 974 as relevant.

12.8.1 Welding Consumables : Covered electrodes shall conform to I.S.

814 (Part-I)-1974 and I.S.814 (Part-II)-1974 or I.S. 1395-1 982 as

appropriate.

Filler rods and wires for gas welding shall conform to I.S. 1278-1972.

The bare wire electrodes for submerged arc welding shall conform to I.S.

7280-1 974. The combination of arc and flash shall satisfy the requirements

of I.S. 3613-1 974.

The filler rods and bare electrodes for gas shielded metal, arc welding shall

conform to I.S. 6419-1971 and I.S. 6560-1972 as appropriate.

12.8.2 Types of Welding: Arc welding (direct or alternating current) or

Oxyacetylene welding may be used. Field welding may be used. Field

welding shall be by D.C.

12.8.3 Size of Electrode Runs: The maximum gauge of the electrodes for

welding any work and the size of run shall be based on the following tables.

Average thickness of plate

or section

Maximum gauge or diameter of

electrodes to be used. Less than 3/16" 10 S.W.G.

3/16" and above but less than 8 S.W.G.



5/8" and above but less than 1" 5/1 6"dia.

1" and above thick section 3/8" dia.

Note : On any straight weld the first run shall not ordinarily be deposited with

a larger gauge electrode than No. 8 S.W.G. For subsequent runs the

electrode shall not be increased by more than two electrode size between

consecutive runs.

12.8.4 Welding Contractors : The contractor shall ensure that each

welding operator employed on fabrication or erection is an efficient and

dependable welder, who has passed qualifying tests on the types of welds

which will be called upon to make. Sample test shall have to be given by

the contractor to the entire satisfaction of the Engineer-in-charge.


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12.8.5 Welding Procedure :

a) Welding should be done with the structural steel in flat position in a

down hand manner wherever possible. Adequate steps shall be taken to

maintain the correct arc length, rate of travel, current and polarity for the type of

electrode and nature of work. Welding plant capacity shall be adequate to carry

out the welding procedure laid down. Adequate means of measuring the current

shall be available either as a part of the welding plant or by the provision of a

portable ammeter. In checking the welding current, a tolerance of 10% or 30

amperes from the specified value whichever is less shall be permitted.

b) The welding procedure shall be such as to ensure that the weld metal

can be fully and satisfactory deposited through the length and thickness of all

joints so that distortion and shrinkage stresses are reduced to the minimum and

thickness of welds meet the requirements of quality specified.

12.9 WORKMANSHIP :

12.9.1 Preparation of Fusion Faces : Fusion faces shall be cut by stearing

machine or gas cutting and later dressed by filling or grinding so that they

shall be free from irregularities such as would interfere with the deposition

of the specified size of weld to cause the defects. Fusion faces and the

surrounding surfaces shall be free from heavy slag, oil paint or any

substance which might affect the quality of the weld or impede the progress

of welding. The welding face shall be free of rust and shall have metal shine

surfaces.

The parts to be welded shall be brought into as close contact as possible and

the gap due to faulty workmanship or incorrect fit up shall not exceed 1/16".

If separation of 1/16" or more occurs locally, the size of the fillet weld shall

be increased at such position by an amount of equal to the width of the gap.

The parts to be welded shall be maintained to their correct position during

welding. They shall be securely held in position by means of tack welds,

service bolts, clamps or rings before commencing welding so as to prevent

and relative movement due to distortion, wind or any other cause.

12.9.2 Step Back Method Should be Used to Avoid Distortion : The

minimum leg length of a fillet weld as deposited should not be less than the

specified size and the throat thickness as deposited should be not less than

that tabulated below:

Throat Thickness of Fillet


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Angle between fusion

faces

600-900 910-

1000

1010-

1060

1070-

1130

1140-

1200 Throat thickness in

cms.

0.70 0.65 0.60 0.55 0.50

In no case should a concave weld be deposited without the specific approval

of the Engineer-in-Charge unless the leg length is increased above the

specified length so that the resultant throat thickness is as great as would

have been obtained by the deposition of a flat.

All welds shall be deposited in a pre-arranged order and sequence taking

due account of the effects of distortion and shrinkage stresses.

After making each run of welding, all slag shall be removed and final run

shall be protected by clean boiled linseed oil till approved.

The weld metal, as deposited, shall be free from crack, slag,excessive

porosity, cavities and other faults.

The weld metal shall be properly fused with the parent metal without

overlapping or serious undercutting at the toes of the weld.

The surfaces of the weld shall have a uniform and consistent contour and

regular appearance.

In welds containing crack, porosity or cavities in which the weld metal tends

to overlap on the parent metal without proper fusion, the defective portions

of the welds shall be out cut and re-welded. Where serious under cutting

occurs, additional weld metal shall be deposited to make good reduction.

Testing of welded joints shall be done as per relevant IS codes 3600, 3613,

4260, 7205, 7215, 7307, 7310, 7318.

12.10 MODE OF MEASUREMENT:

All structural steel shall be measured on weight basis in metric tonnes or

quintals or kgs. as mentioned in the schedule of quantities. The length or areas

of various members including gusset plates shall be measured correct to two

places of decimals and the net weight worked out from the standard steel tables

approved by Indian Standard Institution. No separate measurements shall be

taken for welding, riveting, bolting, field connections etc. The rate shall include

cost of all labour, materials, scaffolding, transport and also cost of welding,

riveting and bolting, field connections if any all to complete the job as per

specifications.

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13. PAINTING :

13.1 SCOPE OF WORK :

The work covered under these specifications consist of furnishing the

various types of paints and also the workmanship for these items, in strict

compliance with these specifications, which are given in detail here-in-after with

the item of schedule of quantities.

13.2 MATERIALS :

Paints, oils, varnishes etc. of approved brand and manufacture shall be

used. Ready mixed paints as received from the manufacturer without any

admixture shall be used.

If for any reason, thinning is necessary in case of ready mixed paint, the

brand of thinner recommended by the manufacturer or as instructed by the

Engineer-in-Charge shall be used. Approved paints, oils or varnishes shall be

brought to the site of work by the contractor in their original containers in sealed

condition. The materials shall be brought in at a time in adequate quantities to

suffice for the whole work or atleast a fortnights work. The materials shall be

kept in the joint custody of the contractor and the Engineer-in-charge. The

empties shall not be removed from the site of work, till the relevant item of work

has been completed and permission obtained from the Engineerin-Charge.

The contractor shall associate the chemist of paint manufacturers before

commencement of work, during and after the completion of work who shall

certify the suitability of the surface to receive painting and the paint before use

etc.

13.3 COMMENCING WORK :

Scaffolding : Wherever scaffolding is necessary, it shall be erected on

double supports tied together by horizontal pieces, over which scaffolding

planks shall be fixed. No ballies, bamboos or planks shall rest on or touch the

surface which is being painted.

Where ladders are used, pieces of old gunny bags shall be tied on their

tops to avoid damage or scratches to walls.

For painting of the ceiling, proper stage scaffolding shall be erected.


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Painting shall not be started until and unless the Engineer-in-Charge has

inspected the items of work to be painted, satisfied himself about their proper

quality and given his approval to commence the painting work.

Painting, except the priming coat, shall generally be taken in hand after all

other builders work, practically finished.

The rooms should be thoroughly swept out and the entire building cleaned

up at least one day in advance of the paint work being started.

13.4 PREPARATION OF SURFACE :

The surface shall be thoroughly cleaned. All dirt, rust, scales, smoke and

grease shall be thoroughly removed before painting is started. Minor patches if

any in plastered/form finished surfaces shall be repaired and finished in line

and level in C.M. 1:1 and cracks & crevices shall be filled with approved filler,

by the contractor at no extra cost to the Department. The prepared surface shall

have received the approval of the Engineer-in-Charge after inspection, before

painting is commenced.

13.5 APPLICATION :

Before pouring into smaller containers for use, the paint shall be stirred

thoroughly in its containers. When applying also, the paint shall be continuously

stirred in the smaller containers so that consistency is kept uniform.

The external surfaces of the buildings under reference including the R.C.C.

Jalli, fins and the panels above and below the window etc. shall be finished in

different colours of approved shade. The contractor will make suitable samples

at site for Departments approvel before taking up the work in hand and they will

be allowed to proceed with the work only after getting Departments approval for

the same.

The painting shall be laid on evenly and smoothly by means of crossing and

laying off, the later in the direction of the grain in case of wood. The crossing &

laying off consists of covering the area with paint, brushing the surface hard for

the first time and then brushing alternately in opposite directions two or three

time and then finally brushing lightly in direction at right angles to the same. In

this process, no brush marks shall be left after the laying off is finished. The full

process of crossing and laying will constitute one coat.

Where so stipulated, the painting shall be done with spraying. Spray

machine used may be (a) a high pressure (small air aperture) type or (b) a low

pressure (large air gap) type, depending on the nature and location of work to


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be carried out. Skilled and experienced workmen shall be employed for this

class of work. Paints used shall be brought to the requisite consistency by

adding a suitable thinner. Spraying should be done only when dry condition

prevails.

Each coat shall be allowed to dry out thoroughly and rubbed smooth before

the next coat is applied. This should be fecilitated by thorough ventilation.

Each coat except the last coat, shall be lightly rubbed down with sand paper

or fine pumice stone and cleaned of dust before the next coat is laid.

No left over paint shall be put back into the stock tins. When not in use,

containers shall be kept properly closed.

The final painted surface shall present a uniform appearance and no streaks,

blisters, hair marks from the brush or clogging of paint puddles in the corners of

panels, angles of mouldings etc. shall be left on the work.

In case of cement based paints/primers, the absorbent surfaces shall be

evenly damped so as to give even suction. In any weather, freshly painted

surfaces shall be kept damp for atleast two days.

In painting doors and windows, the putty around the glass panes must also

be painted, but care must be taken to see that no paint stains etc. are left on the

glass. Tops of shutters and surfaces in similar hidden locations shall not be left

out while painting. Perspect covers of electrical switch boxes have to be painted

from inside by removing them. Care shall be taken while removing them in

position after painting with respective approved paints. In painting steel work,

special care shall be taken while painting over bolts, nuts, rivets, overlaps etc.

The additional specifications for primer and other coats of paints shall be as

in accordance to the detailed specifications under the respective headings.

Any damage caused during painting work to the existing works/surfaces

shall be made good by the contractor at his own cost.

13.6 BRUSHES AND CONTAINERS :

After work, the brushes shall be completely cleaned off paint and linseed oil

by rinsing with turpentine. A brush in which paint has dried up is ruined and shall

on no account be used for painting work. The containers, when not in use, shall

be closed, kept air tight and shall be kept at a place free from dust. When the

paint has been used, the containers shall be washed with turpentine and wiped

dry with soft clean cloth, so that they are clean & can be used again.


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13.7 MEASUREMENT :

a) Painting, unless otherwise stated shall be measured by area in square

metre. Length and breadth shall be measured correct upto two places of

decimal of a metre.

b) No deduction shall be made for opening not exceeding 0.05 sqm. and no

addition shall be made for painting to the beading, moulding edges, jambs,

soffits, sils, architraves etc. of such openings.

c) In measuring painting, varnishing, oiling etc. of joinery and steel work

etc., the co-efficients as in the following table shall be used to obtain the areas

payable. The co-efficients shall be applied to the areas measured flat and not

girthed in all cases.

d) In case of painting of door shutter with push plates in plastic laminate,

deduction will be made for area of such laminations.

13.7.1 Table of multiplying Co-efficients to be applied over areas of different

surfaces to get equivalent plain areas is given in the Appendix-“C-2” of this book.

13.7.2 Explanatory notes on the table of Co-efficients.

1. Where doors, window etc. are of composite types other than those

included in para 47.7 (c), the different portions shall be measured separately

with their appropriate co-efficients, the centre line of the common rail being

taken as the dividing line between the two portions.

2. Measurements for doors, windows etc. shall be taken flat (and not

girthed) over all including chowkhats or frames, where provided. Where

chowkhats or frames are not provided, the shutter measurements shall be

taken.

3. Collapsible gates shall be measured for width from outside to outside of

gate in its expanded position and for height from bottom to top of channel

verticals. No separate measurements shall be taken for the top and bottom

guide, rails, rollers, fittings etc.

4. Rolling shutters of interlocked laths shall be measured for the actual

shutter width and the height from bottom of opening to the centre of the shaft. No

separate measurements shall be taken for painting guides and other exposed

features within or outside the shutter area. The painting of top cover or hood

shall however be measured separately.


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5. Co-efficients for sliding doors shall be the same as for normal types of

doors as mentioned in the table. Measurements shall be taken outside of

shutters, and no separate measurements shall be taken for painting guides,

rollers, fittings etc.

6. Measurement of painting of doors, windows, collapsible gates, rolling

shutters etc. as above shall be deemed to include painting all iron fittings in the

same or different shade for which no extra will be paid.

7. The measurements as above shall be deemed to include also the

painting of edges, blocks, cleats etc. for which no extra will be paid.

8. The co-efficients for doors and windows shall apply irrespective of the

size of frames and shutter members.

9. When the two faces of a door, window etc. are to be treated with different

specified finishes, measurable under separate items, the edges of frames and

shutters shall be treated with the one or the other type of finish as ordered by

the Engineer-in-Charge, and measurement of this will be deemed to be

included in the measurement of the face treated with that finish.

10. In the case where shutters are fixed on both faces of the frames,

the measurements for the door frame and shutter on one face shall be taken in

the manner already described, while the additional shutter on the other face will

be measured for the shutter area only excluding the frame.

11. Where shutters are provided with clearance at top or/and bottom,

such openings shall be deducted from the over all measurements and relevant

co-efficients shall be applied to obtain the area payable.

12. In case of trellis (or jaffri) work, the measurements shall include

the painting of the frame member for which no separate measurements shall be

taken. Trellis door or window shutters shall also be measured under terllis work.

13. Wherever air conditioning grill, lighting, fixtures etc. in false ceiling

are painted along with, measurements shall be taken over all without

deductions for opening in grills and no extra shall be paid for the grills. If grills,

fixtures etc. are not painted, area of fixtures or grills as measured flat (not

girthed) shall be deducted when it exceeds 0.05 sqm. individuals. Where walls

and ceilings are painted in separate colours, the junctions of two paints shall be

brought down on the walls in a straight line by about 6mm.to 12mm. if so

desired, if the junctions of walls and ceilings are not even. Nothing extra shall

be paid to the contractor on this account. Beading wherever provided shall not

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be measured separately but shall be deemed to be included in the area of false

ceiling etc. measured flat (not girthed).

14. For painting open palisade fencing and gates etc., the height shall

be measured from the bottom of the lowest rail, if the palisades do not go below

it, (or from the lower end of the palisades, if they project below the lowest rail),

upto the top of rails or palisades whichever are higher, but not up to the top of

standards when the latter are higher than the top rails or palisades.

15. In the case of asbestos cement corrugated or semi-corrugated

sheeting and iron corrugated sheeting in roofs, side cladding etc., the work

shall be measured flat (not girthed) as fixed.

16. For trusses, compound girders, stanchions, lattice girder and

similar work, actual areas will be measured in sqm. and no extra shall be paid

for painting on bolt heads, nuts, washers etc. even when they are picked out in

a different tint to the adjacent work.

17. Painting of rain water, soil, waste, vent and water pipes etc. shall

be measured in running metres of the particular diameter of the pipe concerned.

Painting of specials such as bends, heads, branches, junctions, shoes etc. shall

be included in the length and no separate measurements shall be taken for these

or for painting brackets, clamps etc.

18. Measurements of wall surfaces and wood and other works not

referred to already shall be recorded as per actual and opening exceeding 0.05

sqm. shall be deducted to get the net payable area. Length and breadth shall be

measured correct upto two places of decimal of a metre and area so worked out

shall be correct upto two places of decimal of a square metre.

19. In case the items of work requiring painting are inclusive of cost of

painting, the painting carried out shall not be measured separately.

13.8 PRECAUTIONS :

All furnitures, lightings, fixtures, sanitary fittings, glazing, floors etc. shall be

protected by covering and stains, smears, splashings, if any shall be removed

and any damage done shall be made good by the contractor at his cost.

13.9 RATES:

Rates shall include cost of all labour and materials involved on all the

operations described above and in the particular specifications given under the

several items.


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13.10 (A) PAINTING PRIMING COAT ON WOOD, IRON OR

PLASTERED SURFACES :

13.10.1 Primer

1. The primer for wood work, iron work or plastered surface shall be as

specified in the description of the item.

2. Primer for Wood work / Iron & Steel / Plastered / Aluminium surfaces

shall be as specified below:

SN SURFACES PRIMER TO BE USED

a Wood work (hard & soft wood): Pink conforming to I.S.3536-

b Resinous wood and ply wood: Aluminium primer

c Iron & Steel, Aluminium and

galvanised Steel

Zinc chromate primer

conforming to d Plastered surfaces, cement brick

work, Asbestos

Cement Primer

3. The primer shall be ready mixed primer of

approved brand and manufacture. 13.10.2

Preparation of surface :

a) Wood work : The wood work to be painted shall be dry and free from

moisture.

The surface shall be thoroughly cleaned. All unevenness shall be rubbed

down smooth with sand paper and shall be well dusted. Knots, if any, shall be

covered with preparation of red lead made by grinding red lead in water and

mixing with strong glue sized and used hot. Appropriate filler material with

same shade as paint shall be used where so desired by the Engineer-in-charge.

The surface treated for knotting shall be dry before painting is applied. After

the priming coat is applied, the holes and indentation on the surface shall be

stopped with glaziers putty or wood putty (for specifications for glaziers putty

and wood putty- refer as mentioned here-in-before). Stopping shall not be done

before the priming coat is applied as the wood will absorb the oil in the stopping

and the latter is therefore liable to crack.

(b) Iron and Steel Work : All rust and scales shall be removed by

scrapping or by brushing with steel wire brushes. Hard skin of oxide formed on

the surface of wrought iron during rolling which becomes loose by rusting, shall

be removed.


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All dust and dirt shall be thoroughly wiped away from the surface.

If the surface is wet, it shall be dried before priming coat is undertaken.

(c) Plastered Surface : The surface shall ordinarily not be painted

until it has dried completely. Trial patches of primer shall be laid at intervals

and where drying is satisfactory, painting shall be taken in hand. Before primer

is applied, holes and undulations, shall be filled up with plaster of paris and

rubbed smooth.

13.10.3 Application : The primer shall be applied with brushes, worked

well into the surface and spread even and smooth. The painting shall be done

by crossing and laying off as described here-in-before.

13.10.4 Other Details : The specifications for Painting (General) shall hold good

so far as it is applicable.

13.11 (B): PAINTING WITH SUPERIOR QUALITY & FLAT OIL READY MIXED

PAINTS ON NEW SURFACE :

13.11.1 Paint : Ready mixed paints shall be of approved brand and

manufacture and of the required shades. They shall conform in all respects to

the relevant I.S. specifications.

13.11.2 Preparation of Surface:

(a) Wood work : The surface shall be cleaned and all unevenness

removed as in para 47.10.2 (a). Knots if visible, shall be covered with a

preparation of red lead. Holes and indentations on the surface shall be filled in

with glaziers putty or wood putty and rubbed smooth before painting is done.

The surface should be thoroughly dry before painting.

(b) Iron and steel work : The primer coat shall have dried up

completely before painting is started. Rust and scaling shall be carefully

removed by scraping or by brushing with steel wire brushes. All dust and dirt

shall be carefully and thoroughly wiped away.

(c) Plastered surfaces : The priming coat shall have dried up

completely before painting is started. All dust or dirt that has settled on the

priming coat shall be thoroughly wiped before painting is started.

13.11.3 Application : The specifications mentioned here-in-before shall

hold good as far as applicable.


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The number of coats to be applied will be as stipulated in the item. The

painted surface shall present a uniform appearance1 and glossy/semiglossy

finish, free from streaks, blisters etc.

13.11.4 Other details : The specifications for Painting (General) specified

here-in-before shall hold good in so far as they are applicable.

13.12 (C) PAINTING WITH SYNTHETIC ENAMEL/SEMI GLOSSY PAINT

ON NEW WORK :

1. Paint : Synthetic enamel/semi glossy paint of approved brand and

manufacture and required shade shall be used for the top coat and an under

coat of shade to match the top coat as recommended by the manufacturer shall

be used. The paint shall be conforming to IS : 1932-1 964.

2. Preparation of Surface : This shall be as per painting with superior

quality ready mixed paint as mentioned here- in- before.

3. Application : The number of coats including the under coat shall be as

stipulated in the item.

3.1 Under Coat : One coat of the specified paint of shade suited to the

shade of the top coat shall be applied and allowed to dry over night. It shall be

rubbed next day with the finest grade of wet abrasive paper to ensure a smooth

and even surface free from brush marks and all loose particles shall be dusted

off. All the cracks, crevices, roughness etc. will be filled with approved putty as

per manufacturers recommendations.

3.2 Top Coat : Finishing coats of specified paint of the desired colour &

shade shall be applied after the under coat is thoroughly dried. Additional

finishing coats shall be applied if found necessary to ensure a proper and

uniform semi glossy surface.

4. Other Details : The specifications for “Painting (General)” mentioned here-in-before shall hold good as far as they are applicable.

13.13 (D) PAINTING WITH ACRYLIC EMULSION/PLASTIC EMULSION

PAINT.

1. This shall be polyvinyl based Acrylic/plastic emulsion paint of approved

manufacture of the required shade, conforming to I.S.5411-1969.

2. Primer: The primer to be used for the painting with acrylic emulsion on

cement concrete surfaces, plastered surfaces, A.C. sheets, timber and metal


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surfaces, if necessary, shall be of approved base and as per recommendations

of the manufacturers.

3. Putty : Plaster filler to be used for filling up (putting) uneven surfaces,

small cracks and holes etc. shall be of approved compound and as per

recommendations of the manufacturers. No oil based putty shall be used. The

putty should be made from a mixture of whiting and plastic emulsion paint or as

per manufacturers recommendations.

4. Finishing coats : All the finishing coats shall be of matt finish or any other

finish as required by the Engineerin-charge. The number of finishing coats shall

be as specified in the item.

MODE OF MEASUREMENT :

All the measurements for payment shall be taken on net surface area

actually painted, unless otherwise specified. Deduction will be made from the

areas for fixtures, grills, ventilation, outlets, electrical boxes and such

obstructions not painted, if they are individually more than 0.05 sqm.

JOB REQUIREMENTS :

i) Acrylic emulsion paint is required to be

provided on plastered and concrete surfaces in

portions of the building. The Department shall

reserve the option to delete or increase

quantities in full or part from the scope of

contract during progress of work.

ii) All wood surfaces are to be painted with

semi glossy synthetic enamel paint with an

approved primer.

All shades and colours of paints shall be subjected to review and prior approval of Engineer-in-Charge shall be taken before the application.

SCOPE OF WORK AND SPECIFICATIONS

14.1 PROJECT:

Planning, Design & Engineering Construction, Testing, Commissioning and

Validation of Bio-Safety Level-2 + (BSL-2 +) Laboratory & Associated works on

“Turnkey Basis” at IIT-Bombay, Powai, Mumbai.


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14.0 SCOPE OF WORK:

1.The Scope of work shall include "Planning design construction of Bio-Safety -2+ (BSL-2+) laboratory , testing validation & associated works (civil, public health electrical, HVAC ) in room no. 201 , 2nd floor Wadhwani Research centre at IITB within IITB Campus Powai . Mumbai-400076 2. The BSL-2+ Laboratory shall be planned and designed in accordance with

the Fifth edition of BMBL Guidelines issued by the U.S. Department of Health

and Human Services, CDC, USA.

3.0The scope under the contract shall cover and include the following works to be executed by the Contractor:

a) Planning of the proposed BSL-2+ Laboratory and preparation of

Architectural Layout Plan and Details. b) Detailed Design & Engineering of Construction Works, Plumbing System

and associated PHE works, Electrical System, HVAC System, Door Interlock and Access Control system, Building Management System and other required and associated systems and services for the proposed BSL-2 + Laboratory Facility.

c) Preparation of working drawings. d) Supply of all the required materials, items and equipment to carry out site

construction works, PHE works, Electrical Works, HVAC works, BMS works, Class II B2 BSC (4’ size - 2 Nos.), Class II A2 BSC (6’ size - 1 No.), installation of equipment and systems for the proposed BSL-2 + Laboratory as per the final design and drawings.

e) Testing and Commissioning of various equipments, items, systems and services supplied and installed in the proposed BSL-2+ Laboratory Facility

f) Validation of complete BSL-2+ Laboratory as per CDC/NIH Guidelines.

4.0 PROPOSED AND DESIRED AREAS IN THE BSL-2+ LABORATORY The proposed BSL-2+ Laboratory facility shall be planned to have the following

areas and facilities:

- Entry Air-Lock

- Change Room

- Two Laboratory Rooms for Animal Cell Culture Lab and Bacterial

Culture & Infection lab of Approx. 3.6 m x 3.0 m and 4.8 m x 3.2 m)

- Adequate negative pressure in the room to ensure no accidental

release of pathogens

- Provision for transfer of equipment and furniture into the facility


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- Ergonomically planned and designed work stations

- Emergency hand and eye wash station

5.0 FACILITY PLANNING AND DESIGN & ENGINEERING

a) The BSL-2+ Laboratory area shall be planned and designed as per the above

stated requirement and in accordance with the Fifth edition of BMBL Guidelines issued by the U.S. Department of Health and Human Services, CDC, USA

b) Pressure gradient shall be maintained as per the recommendations of the

CDC guidelines.

6.0 CONSTRUCTION WORKS

a) Internal Partitions, Ceiling and Flooring Work:

a.1 The internal construction, partition walls and ceiling of the proposed BSL-2+ Laboratory and associated support areas shall be carried out in non-particle shredding, pre-fabricated wall and ceiling panels to give seamless and monolithic construction.

a.2 Wall to wall, wall to floor and wall to ceiling corners shall be provided

with approx. 3” coving. a.3 The wall and ceiling surface finish shall be in Polyurethane/Epoxy

paint/Powder Coating to provide impervious, monolithic, chemical resistant (organic solvents, acids and alkalis), antibacterial and antifungal finish and allow use of wide range of chemicals for fumigation of lab space.

a.4 The flooring shall be done in 3 mm thick Self Leveling Epoxy.

b) Public Heath Engineering (PHE) Works:

b.1 The water distribution piping shall be carried out in PPR.

b.2 All the penetrations/cutouts/openings made in the walls and ceilings for providing services and utilities shall be sealed with epoxy sealant.

b.3 The BSL-2+ Laboratory drain piping shall be in welded SS/HDPE and

connected to effluent decontamination tank. The effluent decontamination tank shall be of 500 ltr capacity and shall have arrangements for inserting disinfectant chemical.


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b.4 Emergency hand and eye wash station shall be provided. Hand wash stations shall be provided with hands free tap.

c) Doors and Windows:

c.1 The window shall be non-openable type and the frame shall be flushed with the wall. The window frame shall be in MS Powder Coated/Epoxy Painted frame. The window panel shall be provided in 6 mm thick toughened glass double glass panels. The window frame and glass panels shall be properly sealed.

c.2 The doors frames and door shutters shall be in metallic construction

with chemical resistant finish. Inspection windows in doors shall be provided. The doors shall be provided with lip gaskets on sides and top and drop down gasket at the bottom. The doors shall be complete with door closer, SS kick plate, door handle and key lock.

d) Portable Fire Fighting Device/Fire Extinguisher:

d.1 Dry Powder type/CO2 type portable fire extinguishers shall be provided, for fire safety.

7.0 HEATING VENTILATION & AIR-CONDITIONING (HVAC) SYSTEM AND BUILDING MANAGEMENT SYSTEM WORKS The HVAC system shall be designed and installed to maintain the approved

inside conditions of temperature, humidity, air-change rate (ACPH), air filtration through HEPA filters, room/zone differential pressure gradient and conditions.

The HVAC System shall be designed and provided to maintain the following

conditions:

Inside Temperature: 220+/- 10 C

RH: 55 +/-5 %

Sound level : 45-50db

Ventilation Requirement: 70% Re-circulation, 30% Exhaust The HVAC system shall include the following items of works, complete in all

respect, as required and approved.

a) Refrigeration Unit:

The Refrigeration Unit shall be DX type, skid mounted and complete with multiple Compressors connected to multiple DX coils in series to cater to


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varying operating conditions and fluctuating cooling load requirements. The unit shall be complete with Compressors, Air Cooled Condensers, interconnecting control and power wiring, refrigerant charge etc. complete in all respect.

b) Air Handling Units:

The Air Handling units shall be designed and provided to supply conditioned air to the Laboratory and support areas. The Air Handling Units shall be Double Skin type and shall be complete with blower, motor, drive set, DX cooling, pre-filter, drain tray etc. complete in all respect. The system shall be designed with multiple Air Handling Units each with multiple DX coils in series to cater to varying operating conditions and fluctuating cooling load requirements. Each DX coil shall be connected to a single compressor, in an isolated/separate refrigerant circuit.

c) Exhaust Air to Fresh Air Heat Recovery Unit/s:

A cost effective Air to Air Heat Recovery unit/s should be supplied to recover

cooling effect from the exhaust air to precool the fresh air in order to reduce the cooling load and the operating cost of HVAC system. Heat recovery unit should be of the type that ensures no cross contamination between the two air streams.

d) Exhaust Blowers:

A separate dedicated Exhaust Blower shall be designed and provided for Exhaust from the BSL-2+ Laboratory area. The Class II B2 Bio-Safety Cabinets shall have separate dedicated Exhaust Blowers with Standby Blower arrangement.

The exhaust blowers shall be Centrifugal type blowers complete with blower casing, SISW blowers, drive set, base frame etc. complete in all respect. The Exhaust Blowers shall be provided with Back Draft Damper/s to prevent backflow of air into the Laboratory.

e) HEPA Filters:

Three stage air filtration shall be provided for supply air.

a) The first stage shall be for 5 micron particulate size b) Second stage shall be for 0.5 micron particulate size c) Third stage shall be for 0.3 micron particulate size HEPA Filter


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The exhaust air from the BSL-2+ Laboratory and Class II B2 Bio-Safety Cabinets shall be filtered through dedicated set of HEPA filter Bank.

The HEPA filter shall have 99.97% efficiency for 0.3 micron particulates. The HEPA filters shall be HOT DOP tested at the manufacturer’s works, before supply at site, as per ASTM D 2986-71, US-MIL STD 282 to validate the filter efficiency. The HEPA filters shall be of micro-fibreglass filter media mini pleated type and shall be capable to withstand corrosive agents and gases used for lab fumigation. The HEPA filters shall be installed in HEPA filter plenums constructed in SS 304. The HEPA filter plenums shall be provided with manually operated bio-safety isolation dampers and provision to allow in-situ decontamination of the HEPA filters and also provision to carry out DOP test of the HEPA filters. Each HEPA filter plenum shall be provided with Magnehelic Gauge to monitor the filter status.

f) Virus burn out unit:

The exhaust air from the BSL-2+ Laboratory and Class II B2 Bio-Safety Cabinets shall be passed through dedicated Virus Burn-out unit before being released in the environment.

g) Supply and Exhaust/Return Air Ducting:

The supply air ducting shall be carried out in GI sheet as per SMACNA standards.

The return/exhaust air ducting from the BSL-2+ Laboratory and BSC shall be carried out in PP/HDPE. The ducting after the exhaust air HEPA plenums upto the exhaust blowers shall be carried out in GI sheet as per SMACNA standards.

h) Building Management System and Controls:

A customized Building Management System shall be designed and provided to control the operation of HVAC system and to monitor the laboratory operating parameters in the BSL-2+ Lab rooms/zones pressure, supply air quantity in each room, BSC Cabinet status, AHU status, exhaust blower status, VFD status, Room temperature & RH. The BMS Control System shall comprise of: i) VFD for Air Handling Units and Exhaust Blowers ii) Air Flow Control Valve with Integral Airflow Measurement for each

BSL-2+ Lab room iii) Motorized Dampers with Open /Close Actuator for BSC Exhaust

Blowers


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iv) Fresh Air Damper with Proportionating Actuator v) Return Air Damper with Proportionating Actuator vi) Exhaust Air Damper with Proportionating Actuator vii) Pressure, Temperature & RH Sensors in each BSL-2+ Lab Room

The above components shall be fully integrated with the BMS to provide control and monitoring of the BSL-2+ Laboratory operating conditions. The Building Management System shall be designed and provided to allow START/STOP operation of the Complete HVAC system in AUTO Mode and the System shall have the provision to over-ride the parameters (password protected) and to enable START/STOP operation of the HVAC system in MANUAL mode as well. The Building Management System shall be complete with PLC’s, Sensors, Controllers, power and control wiring, Software and other associated field devices and hardware, complete in all respect, as per requirement and approved design. The HVAC system start and stop sequence shall be interlocked to provide the ON and OFF functions such that it should prevent positive pressurization of the BSL-2+ Laboratory, at any point of time.

8.0 ELECTRICAL SYSTEM AND WORKS The contractor shall design and provide the complete electrical power distribution

system scheme for the proposed BSL-2+ Laboratory. The electrical distribution system shall be designed and installed as per the Indian Electricity Rules and other relevant Standards and Guidelines.

a) Power Distribution system

The contractor shall design and provide the main power distribution panel, sub-distribution boards and panels complete with required switchgears, breakers, circuit breakers, power and control wiring etc. complete as required and approved, for power distribution system for the proposed BSL-2+ Laboratory.

The scope of work shall include internal lighting and power, cabling/wiring for HVAC System, Bio-safety cabinets, door interlocks and BMS etc. complete in all respect.

b) Backup Power System

A dedicated UPS with Batteries shall be provided for providing Un-interrupted power supply to the BMS and Door Interlock System. The UPS shall be capable to give approx. 10-15 minutes of power backup, in case of mains power failure.


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c) Internal Light Points, Fittings and Fixtures

The Electrical fittings and fixtures in the BSL-2+ Laboratory area shall be sealed type, leak proof and capable to withstand chemical exposures during laboratory fumigation. All the light points, power points, light and power sockets shall be fully wired with switches, sockets, connections complete in all respect as per approved designs and drawings.

d) Fire Detection and Alarm System

Fire Detection & Alarm System shall be designed and provided for the proposed BSL-2 Laboratory. The FDA system shall be designed as per the relevant standards and guidelines. The Fire Detection and Alarm system shall be complete with Smoke detectors, Heat detectors, Fire Alarm Panel, manual call points, response indicators and power and control wiring and cabling complete in all respect.

e) Communication Facility

The proposed BSL-2+ Laboratory rooms shall be provided with Data and Voice points, for communication. The Data and Voice points shall be fully wired and complete with I/O points.

9.0 EQUIPMENTS & SYSTEMS

a) Bio-Safety Cabinet

The Bi-Safety Cabinets shall be Class II B2 Type (4’ size – 2 Nos.) and Class II A2 type (6’ size – 1 No.). The BSC shall comply with NSF 49 standards

The Bio-Safety Cabinet body, frame and supports shall be constructed in SS 316 L. The work surface shall be perforated SS 316 L. The front shall have SS 316 L top section and sliding sash in toughened glass with required counter weight.

The Bio-Safety Cabinet shall be complete with following accessories and

features/specifications:

- Air velocity not to exceed 0.65 m/sec at supply air HEPA filter face - Working chamber to operate under at least 10 mm negative pressure with

respect to the room pressure - Drain receptable with drain faucet


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- Sealed flourescent light - UV light - Extract plenum - In situ sterilization facility for HEPA filter/s - Automatic extract air control damper - Auto adjustable motor / blower - Decontamination Ports for Bio-Safety Cabinet chamber/workstation - 2 Nos. Power outlet switch/sockets - 80 to 100 fpm air inlet velocity at 8-10 inches of sash opening - HEPA filters shall be mini pleat separator less type with 99.97 % efficiency

down to 0.3 micron particle size - Magnehelic differential pressure gauge to indicate work chamber pressure

and across the HEPA filter - Control console with indication lamps

b) Ventilated Garment Storage Cabinets

The Garment Storage Cabinet shall be constructed in SS 316 L and shall be ventilated type and shall conform to BS 5295-76. The garment storage cubicle shall be complete with motor blower assembly, re-circulatory plenum, fluorescent light, UV germicidal lamp, filter, Activated carbon filter for odour neutralization, control switches, indications etc.

The ventilated garment storage cabinets shall meet the following

requirements:

Approx. Dimensions : 1000 mm (W) x 710 mm (D) x 1000

(H)

Storage racks/shelves : 3 Nos.

Air Flow : Shall be 0.45 m/sec to 0.65 m/sec

Cleanliness Level : Class M 3.5

Noise Level : Less than 70 dBA

Power requirement : 230 V AC, 50 Hz, 1 Phase

c) Door Interlock System

The Door Interlock system shall be complete with door electromagnets, door release push buttons, control and power wiring and cabling and other required accessories and hardware. The access control system shall be powered


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through UPS supply for uninterrupted operation even during mains power failure.

d) Laboratory Work Station

The BSL-2+ Laboratory rooms shall be provided with Work Stations. The work

stations shall be planned and provided for most optimum utilization of laboratory space and shall be provided with adequate under-counter and overhead storage space. The Laboratory work stations shall be constructed in SS 304.

Laboratory Chairs shall be supplied with each BSC and Work Station ( Minimum 6 nos). The

chair shall be in non-leather and non-fabric finish, with adjustable height.

General 15.1 The Contractor shall physically check the dimensions at site and prepare and submit the shop drawing for approval immediately before executing the work. 15.2 SHOP DRAWINGS

The Contractor shall submit three (3) complete sets of detailed working and shop drawings and schedules of all BSL-2+work. Fabrication shall not commence until (1) set of the shop drawings has been returned to the Contractor and stamped by the Engineer as approved for fabrication.

No other substitutions in sizes or shapes of members shall be made without prior approval and no variation to the details shown on the shop drawings shall be made unless authorised by the Consultant. Minor details not shown on the drawings shall conform to the relevant Indian code/ US code and to the approval of the Consultant.

15.3 Cutting

Cutting shall be affected by shearing, cropping, sawing or gas cutting and shall be reasonably square and free from distortion with all burrs removed. If directed by the Consultant the edges shall be ground afterwards.

For gas cutting high tensile steel, sufficient metal shall be left beyond the required profile so that all metal that has been flame hardened cube removed later by machining. Except where the material is subsequently joined by welding, no load-transmitting surface shall be gas cut.

Plates in built-up members shall be end and edge planed, except where flats with square edges are used. Plates specified to be planed, milled or chipped, shall be cut in the first instance to such size as to allow 3 mm to be planed, milled or chipped, from the sides and ends. Edges of gussets up to and including 8 mm in thickness


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may be sheared in a machine, which can take the full side in one cut. Planning, milling or grinding shall prepare edges of gussets of greater thickness.

Edge preparation for surfaces to be welded shall be carried out by grinding planning but not shearing or cropping.

15.4 Drilling and Punching

a) Holes through more than one thickness of material for members, such as compound stanchion and girder flanges shall be drilled after the members are assembled and tightly clamped or bolted together. Punching may be permitted before assembly, provided the holes are punched 3 mm less in diameter than the required size and reamed, after assembly, to the full diameter. The thickness of material punched shall be not greater than 16 mm.

b) Drilled or reamed holes shall be cylindrical and perpendicular to the surface. They shall not be more than 1.5 mm larger than the specified diameter of bolts up to and including 25 mm in diameter.

c) When holes are drilled in one operation through two or more separable parts, these parts, when so specified by the Consultant, shall be separated after drilling and the burrs removed.

d) Holes in connecting angles and plates, other than splices, roof members and light framing, may be punched full size though material not over 13 mm thick, except where required for close tolerance or barrel bolts.

e) Matching holes for bolts shall register with each other so that a gauge of 1.5 mm or 2.0 mm (as the case may be, depending on whether the diameter of the bolt is less than or more than 25 mm) less in diameter than the diameter of the hole will pass freely though the assembled members in the direction at right angle to such members. Finished holes shall be not more than 1.5 mm or 2.0 mm (as the case may be) in diameter larger than the diameter of the rivet or black bolt passing through them, unless otherwise specified by the Consultant.

f) Holes for turned and fitted bolts shall be drilled to a diameter equal to the nominal diameter of the shank or barrel subject to H8 tolerance specified in IS: 919-1959 Recommendations for Limits and Fits for Engineering. Preferably, parts to be connected with close tolerance or barrel bolts shall be firmly held together by tacking bolts on clamps and the holes drilled through all the thickness at one operation and subsequently reamed to size. All holes not drilled through all thickness at one operation shall be drilled to a smaller size and reamed out after assembly. Where this is not practicable, the parts shall drilled and reamed separately through hard bushed steel jigs.

g) A gas cutting process shall not form holes for bolts.

h) All holes shall be free of burrs, fins and other defects

i) No holes shall be drilled in structural members at locations other than those indicated on the drawings unless approved in writing by the Consultant.


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15.5 Assembly

The component parts shall be assembled in such a manner that they are neither twisted, bend nor otherwise damaged, and shall be prepared that the specified cambers, if any, are provided.

16 Bolts, Pins, Nuts and Washers

16.1 General

All bolts shall be of such a length that at least one full thread but not more than 12mm of the threaded part of the bolt is exposed beyond the nut, after the nut has been tightened. Bolts shall comply with IS: 281 and IS: 3757.

All bolts shall be fitted with one washer under the nut. Where a nut or bolt bears on an inclined surface, a leveled washer of the correct shape shall be used between the surfaces. Where necessary, washers shall be tapered or otherwise suitably shaped to give the heads and nuts of bolts a satisfactory bearing.

Bevelled washers shall not be allowed to move out of their correct positions during fabrication and erection. No connection shall be made with less than two bolts and both shall be not less than 16 mm diameter, unless otherwise indicated on the drawing.

In all cases where the full bearing area of the bolt is to be developed, the bolt shall be provided with a washer of sufficient thickness under the nut to avoid any threaded portion of the bolt being within the thickness of the parts bolted together.

16.2 Bolt Tightening

Bolts shall be "snug tightened" as defined as the tightness attained by a few impacts of an impact wrench or by the full effort of a man using a standard podgier spanner

Snug tightening shall be achieved by using a standard wrench to ensure intimate positive contact between mating surfaces. Bolts, nuts and washers that are snug tightened shall be hot dipped galvanized and centrifugally spun to remove excess spelt

17.0 WELDING

17.1 Welding Steel

a) All welders to be employed on the works shall be qualified to an appropriate standard as per the procedures outlined in the relevant Indian Standard. Testing of all welders shall be carried out before any work is commenced. Only Welders who pass the test shall be permitted to work only for those positions for which they were tested and passed.

b) Welding shall be in according with the following Indian Standards as applicable.

IS 816-1969 Code of Practice for use of metal arc welding for general construction in mild steel.


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IS 822-1970 Code of practice for inspection of welds

IS 9595-1980 Recommendations for metal-arc welding of carbon and carbon manganese steels.

c) For welding for any particular type of joint, welders shall submit evidence acceptable to the Consultant of having satisfactorily completed appropriate tests as described in the following relevant Indian Standards.

IS: 7307-1974 Approval tests for welding procedure.

IS 7310-1974 Approval tests for welders working to approved welding procedure.

Unless otherwise stated all welds shall be electric metal arc welds.

d) All welding procedures shall be arranged, to suit the details of joints indicated on the drawings. Welding shall be carried out shall be such as to ensure that the weld metal is full and satisfactorily deposited throughout the length and thickness of all joints.

Members to be welded shall be securely held in their relative position during welding, either by jigs or tack welding.

Profile of fusion faces may be prepared by shearing, chipping, or gas cutting. In all cases the faces should be dressed by chipping, filling or grinding and made regular.

For thickness of metal 16 mm and above, electrodes used shall be Supercito (E-7018) or equivalent. For thicknesses of metal below 16 mm the root run shall be with Phillpe 31 (E 6010) electrodes, (or equivalent) and subsequent runs shall be with Overchord - SS (E- 6013) electrodes (or equivalent). The electrodes shall be dried in an electric oven as per the recommendations of manufacturers. Only DC current shall be used for welding and the Contractor shall make his own arrangements of all welding power and for equipment.

Vertical down welding shall not be permitted. All welds shall be back-gouged and welded from the backside unless specifically approved otherwise.

All welds shall be carried out in such a sequence and manner as to cause minimum distortion of the welded parts.

Multiple run welds shall be carried out with each run closely following the previous run, but so that sufficient time is allowed for slag removal.

Welds shall on completion present an even, smooth and regular finish free from defects. The weld metal shall be solid throughout with complete fusion between weld metal and parent metal and between successive runs throughout the joints. Caulking shall not be used to correct defects.

17.2 Surface Cleaning Prior to Welding

Surfaces to be welded shall be free from loose scale, slag, rust, grease, paint and other foreign materials. Surfaces need not be cleaned of Zinc Silicate primer if present prior to welding.


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17.3 Cleaning

Upon completion of each welding pass, the weld shall be cleaned of spatter, slag and flux deposits. The weld must show a good clean contour and on a cut specimen good fusion with the parent metal. After welding is complete, adjacent surfaces shall be thoroughly cleaned of all spatter and deposits.

17.3 Size of Welds

All structural welds shall be continuous around all mating faces and edges of the members being connected. If not detailed on the drawings welds shall be sized to develop the full strength of the smaller of the two members being joined and not less than 8mm.

17.4 Compatibility of Welds

All welds shall develop the strength and ductility specified for the steel being welded. Welds forming connections between steel of different grades shall develop at least the same unit strength as that specified for the higher strength steel.

17.5 Automatic Welding

Automatic and semi-automatic welding processes may be employed provided they are approved by the Engineer and conform to the requirements of these specifications. All equipment for automatic and semi-automatic welding shall be subject to approval by the Consultant. Pre-heating will be required where any section thickness exceeds 30mm. Requirements for, and method of, pre-heating shall be submitted to the Consultant for approval.

17.6Inspection

Upon completion of steel fabrication and before any surface treatment is applied, the Contractor shall allow inspection of the steelwork by the Consultant who may reject the steelwork if it fails to meet the requirements of this Specification.

17.7 Following welding tests shall be carried out if asked by Consultants at contractors' cost.

Ultra Sonic test for fillet weld

18 MISCELLANEOUS METALS

18.1 Fabrication

All miscellaneous metal work shall be formed true to detail, with clean, straight, sharply defined profiles, and smooth surfaces of uniform colour and texture and free from defects impairing strength or durability.

Connections and accessories shall be of sufficient strength to safely withstand stresses and strains to which they will be subjected. Accessories and connections to steel or


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cast iron shall be steel, unless otherwise specified. Threaded connections shall be made so that fitting conceals the threads.

Welded joints shall be rigid and continuously welded. The face of welds shall be dressed flush and ground smooth. Exposed joints shall be close fitting and joined where least conspicuous.

18.2 Finishes

All steel work shall be thoroughly cleaned, by effective means, of all loose mill scale, rust, grease and foreign matter and shall be treated in the workshop prior to transportation. If painted it shall be applied to dry surfaces and shall be thoroughly and evenly spread and well worked into joints and open spaces. Abrasions in field erection shall be touched up (including primer) immediately after erection.

18.3 Bolts and Nuts

Screw and bolt anchors, that are not shown, shall be cinch anchors, rawl or of

the slug-in type. Anchors shall be minimum "two unit" type. Toggle bolts shall

be of the size indicated and shall be galvanised. Bolt and nut threads shall be

galvanised and shall conform to the aforementioned codes. Design and

Construction of Biosafety Level-2+ (BSL-2+) Laboratory at IIT-Bombay, Powai, Mumbai on

Turnkey Basis.

Design and Construction of Biosafety Level-2+ (BSL-2+) Laboratory at IIT-Bombay, Powai,

Mumbai on Turnkey Basis.

18.4 Chemical Anchors

The Contractor shall supply and install all chemical anchors shown on the Drawings. Chemical anchors shall be Hilti - Masonry Rawl Plug anchors or approved equivalent. Substitution with Dynabolt or expansion bolts shall not be permitted. After completion of the drilling of the hole for the chemical anchor the hole shall be cleaned of dust using compressed air.

18.5 SURFACE TREATMENT

Following the completion of fabrication all steel shall be cleaned and protective coated in accordance with the procedures specified in the Surface Treatments Section of this specification.

Protective coatings damaged during the Contract shall be rectified as specified in the Surface Treatments Section of this Specification and/ or to the approval of the Engineer at the Contractor's expense.

All bolts, nuts and washers shall be hot dipped galvanised unless noted otherwise. These and any other items as detailed on the Drawings and the Specification to be hot


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dipped galvanised shall be in accordance with IS: 1239 (Part I and II) or an equivalent approved standard.

19 MISCELLANEOUS

19.1 Inspection and Testing

The Project Engineer shall have free access at all reasonable times to those parts of the Contractors works which are concerned with the fabrication of the steel work. He shall be afforded all reasonable facilities for satisfying himself that the fabrication is being undertaken in accordance with the provisions of the Specification. Unless specified otherwise, inspection shall be made at the place of manufacture prior to dispatch and shall be conducted so as not to interfere unnecessarily with the operation of the work.

The Contractor shall guarantee compliance with the provisions of the Specification, if required to do so by the Engineer. Should any structure or part of a structure be found not to comply with any of the provisions of the Specification, it shall be liable to rejection. No structure or part of the structure, once rejected shall be resubmitted for test, except in cases where the Consultant considers the defect as rectifiable. Defects, which may appear during fabrication, shall be made good by the Contractor with the consent of, and according to the procedure laid down, by the Consultant.

The Contractor shall supply all gauges and templates necessary to satisfy the Consultant. The Consultant may, at his discretion, check the test results obtained at the Contractor’s works by independent tests at the Government Test House or elsewhere. Should the material tested be found to be unsatisfactory, the costs of such tests shall be borne by the Contractor, and if satisfactory, the costs shall be borne by the Employer.

20 ERECTION

20.1Plant and Equipment The suitability and capacity of all plant and equipment used for erection shall be to the satisfaction of the Consultant. Details of the proposed equipment shall be submitted for approval 6 weeks prior to erection commencing.

20.2 Storing and Handling All structural steel should be so stored and handled at the site that the members are not subject to excessive stresses and damage.

20.3 Setting out

The positioning and levelling of all steel work with accuracy shall be in accordance with the approved Drawings, Specifications and to the satisfaction of the Consultant.

20.4 Security During Erection

During erection, the steel work shall be securely bolted or otherwise fastened and, where necessary, temporarily bracing provided for all load to be carried by the structure during erection including those due to erection equipment and its operation.


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No permanent bolting or welding should be done until proper alignment has been obtained.

20.5 Field Connections

All field assembly and welding shall be executed in accordance with the requirements for shop fabrication, excepting such as manifestly apply to shop conditions only. Where the steel has been delivered painted, the paint shall be removed before field welding, for a distance of at least 50 mm on either side of the joints.

20.6 Painting after Erection

Prior to the painting of steel, which is delivered unpainted, commences, all surfaces to be painted shall be dry and thoroughly cleaned from all loose scale and rust. The specified protective treatment shall be completed after erection. All bolt heads and site welds shall be cleaned.

Where the steel has been surface treated in the workshop, the coating shall be completed on site so as to be continuous over any welds and site rivets or bolts. Bolts, which have been galvanized or similarly treated, are exempted from this requirement. Surfaces, which will be inaccessible after site assembly, shall receive the full-specified protective treatment before assembly.

21 GROUTING

Unless otherwise stated on the Drawings a space of not less than 25mm shall be provided between undersides of column base plates and between all beam and roof truss bearings, and concrete pads, footings etc.

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