Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

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“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 8451 (2009): PERIODIC INSPECTION AND TESTING OF HIGHPRESSURE GAS CYLINDERSCODE OF PRACTICE [MED 16: MechanicalEngineering]

IS 8451 : 2009

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Indian StandardPERIODIC INSPECTIONANDTESTINGOF HIGH

PRESSURE GAS CYLINDERSóCODEOF PRACTICE( Second Revision )

ICS 23.020.30

© BIS 2009

B U R EAU O F I N D I AN S TAN DAR D SMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEWDELHI 110002

May 2011 Price Group 9

Gas Cylinders Sectional Committee, MED 16

FOREWORD

This Indian Standard (Second Revision) was adopted by the Bureau of Indian Standards, after the draftfinalized by the Gas Cylinders Sectional Committee had been approved by the Mechanical EngineeringDivision Council.

This standard was first revised in 1984. In this revision following clauses have been added/modified:

a) Title and scope modified.b) Depressurization and devalving procedures.c) Pressure test or ultrasonic examination.d) Inspection of valves and other accessories.e) Replacement of cylindrical part.f) Check on tare weight.g) Rejection criteria.

Along with the above clauses following annexures have also been added in this revision:

a) Inspection period (Annex A).b) Corrosive gases to cylinder material (Annex B).c) Description, evaluation of defects and conditions at time of visual inspection (Annex C).d) De-valving procedure when cylinder valve is obstructed (Annex D).e) Volumetric expansion testing of gas cylinders (Annex E).f) Recommended procedures for inspection and maintenance of valves (Annex F).

The Gas Cylinders Rules, 2004 and the Indian Standard specifications relating to compressed gas cylinderrequire that a cylinder be condemned when it leaks, or when internal or external corrosion, denting, bulging,or evidence of rough usage exists to the extent that the cylinder is likely to be weakened appreciably.

This standard has been formulated as a guide to cylinder users and fillers for establishing their own cylinderinspection procedures and standards. It is, of necessity, general in nature although some specific limits arerecommended. It should be distinctly understood that it will not cover all circumstances for each individualcylinder type. Each cylinder user is expected to modify them to suit his own cylinder design or the conditionsof use that may exist in his own service. Rejection, or acceptance for continued use in accordance with theselimits, does not imply that these cylinders are, or are not, dangerous, or subject to impending failure, butrepresents practice which has been satisfactory to a cross section of the industry.

Experience in the inspection of cylinders is an important factor in determining the acceptability of a givencylinder for continued service. Users lacking this experience and having doubtful cylinders should returnthem to a manufacturer of the same type of cylinders for reinspection.

In the formulation of this standard, considerable assistance has been derived from ISO 6406 : 2005 ëPeriodicinspection and testing of seamless steel gas cylinderí.

The composition of Committee responsible for the formulation of this standard is given in Annex H.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value,observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance withIS 2 : 1960 ëRules for rounding off numerical values (revised)í. The number of significant places retained inthe rounded off value should be the same as that of the specified value in this standard.

IS 8451 : 2009

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Indian StandardPERIODIC INSPECTIONANDTESTINGOF HIGH

PRESSURE GAS CYLINDERSóCODEOF PRACTICE( Second Revision )

1 SCOPE

This standard deals with seamless steel transportablegas cylinder (single or those from bundles) intendedfor compressed and liquefied gases under pressure,of water capacity from 0.5 litre up to and including150 litres. It also applies, as far as practicable, tocylinders of less than 0.5 litre water capacity.

This standard specifies the requirement for periodicinspection and testing to verify the integrity of suchgas cylinders to be reintroduced into service for afurther period of time.

This standard does not apply for periodic inspectionand testing of acetylene cylinders and compositecylinders.

2 REFERENCES

The following standards contain provisions, whichthrough reference in this text, constitute provisionsof this standard. At the time of publication, theeditions indicated were valid. All standards aresubject to revision and parties to agreements basedon this standard are encouraged to investigate thepossibility of applying the most recent editions ofthe standards indicated below:

IS No. Title3224 : 2002 Valve fittings for compressed gas

cylinders excluding liquefiedpetroleum gas (LPG) cylinders ñSpecification (third revision)

3745 : 2006 Yoke type valve connections forsmall medical gas cylinders(second revision)

3933 : 1966 Colour identification of gascylinders and related equipmentintended for medical use

4379 : 1981 Identification of contents ofindustrial gas cylinders (firstrevision)

7285 (Part 2) : Refillable seamless steel gas2004 cylinders ó Specification: Part 2

Quenched and tempered steelcylinders with tensile strengthless than 1 100MPa (112 kgf/mm2)(third revision)

8198 : 2004 Steel cylinders for compressedgas (atmospheric gases,hydrogen, high pressureliquefiable gases and dissolvedacetylene gases) ñ Code ofpractice

8868 : 1988 Periodical inspection interval forgas cylinders in use

9122 : 2008 Inspection gauges for checkingtype 2 taper threads of gascylinder valves, taper 3 in 25 óSpecification (first revision)

10609 : 1983 Refrigerants ó Numberdesignation

3 INTERVALS BETWEEN PERIODICINSPECTION AND TESTA cylinder shall be due for a periodic inspection andtest on its first receipt by a filler after the expiry ofthe interval in accordance with the requirementsgiven in IS 8868 or as approved by the statutoryauthority.

Provided the cylinder has been subjected to normalconditions of use and has not been subjected toabusive and abnormal conditions rendering thecylinder unsafe, there is no general requirement forthe user to return a gas cylinder before the contentshave been used even though the test interval mayhave lapsed.

NOTE ó In the case of cylinders used for emergencypurposes (for example fire extinguishers, breathingapparatus, etc) it is the responsibility of the owner oruser to submit it for a periodic inspection and tests withinthe interval specified by national authorit ies or asspecified in the relevant cylinder design standard, if thisinterval is shorter.

4 LIST OF PROCEDURES FOR PERIODICINSPECTIONANDTEST

Each cylinder shall be submitted to periodicinspections and tests. The following procedures formthe requirements for such inspection and test andare explained in delail in the following clauses:

a) Identification of cylinder and preparation forinspection and test (see 5);

IS No. Title

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b) Depressurization and devalving (see 6);c) External visual inspection (see 7);d) Check of internal condition (see 8);e) Supplementary tests (see 9);f) Inspection of cylinder neck (see 10);g) Pressure test or ultrasonic examination

(see 11);h) Inspection of valve and other accessories

(see 12);j) Replacement of cylinder parts (see 13);k) Final operations (see 14); andm) Rejection and rendering cylinder unservice-

able (see 15).

It is recommended that the previously listedprocedures be performed in the suggested sequence.In particular, the check of internal condition (see 8)should be carried out before the pressure test orultrasonic examination (see 11).

Cylinders that fail in inspections or tests shall berejected (see 15). Where a cylinder passes thepreviously listed procedure, but the condition of thecylinder remains in doubt, additional tests shall beperformed to confirm its suitability for continuedservice (see 9) or the cylinder shall be renderedunserviceable.

The inspections and tests shall be carried out onlyby persons authorized under the relevant regulations.

Mechanical properties of steel cylinders may beaffected by heat exposure. Therefore, the maximumtemperature for any operation shall be limitedaccording to the manufacturerís recommendation.

5 IDENTIFICATION OF CYLINDER ANDPREPARATION FOR INSPECTIONS AND TESTS

Before any work is carried out, the relevant cylinderdata and its contents and ownership shall beidentified.

If contents are identified as hydrogen or otherembrittling gases, only those cylinders manufacturedor qualified as hydrogen cylinders shall be used forthat service. It shall be checked that the cylinder iscompatible for hydrogen service, with respect to themaximum tensile strength and internal surfacecondition.

6 DEPRESSURIZATION AND DEVALVINGPROCEDURES

All cylinders other than cylinders at manufacturerísworks shall be presumed to contain gas underpressure and the following precautions shallaccordingly be observed.

6.1 The cylinder contents shall be released in a safe

manner keeping in mind dangers associated with thenature of the gas in the cylinder. Cylinders, whichcontain or may have been contaminated by poisonousor obnoxious substances, shall be emptied only bytest stations properly equipped and experienced tohandle the particular gas/substance. Such cylindersshall be clearly labelled that they have beencontaminated.

6.2 The valve shall be opened and if no gas escapesand the port is not visibly blocked, a charge of lowpressure nitrogen or other inert gas shall be blowninto the valve outlet. Discharge of gas after removalof the nitrogen supply indicates that the cylinder isempty. When no gas discharges the valve shall betreated as obstructed. Where a cylinder hascontained poisonous or obnoxious substances, andthe valve is suspected of being obstructed, the gasshall be released within an approved appliance andthe valves shall be removed in such a manner thatthe gas escapes without danger to the operator.

6.3 Should the valve be obstructed the contents ofthe cylinder shall be released in safe manner as givenin 6.1. Work on cylinders containing combustiblegases shall be carried out in the open air.

7 EXTERNALVISUALINSPECTION

7.1 Preparation for External Visual Inspection

When necessary, the cylinder shall be cleaned andhave all loose coatings, corrosion products, tar, oilor other foreign matter removed from its externalsurface by a suitable method, for example, bybrushing, shot blasting (under closely controlledcondition), water jet abrasive cleaning, chemicalcleaning or other suitable methods. The method usedto clean the cylinder shall be validated, controlledprocess. Care shall be taken at all times to avoiddamaging the cylinder or removing excess amountsof cylinder wall (see Annex C).

If fused nylon, polyethylene or a similar coating hasbeen applied and the same is seen to be damaged orprevents a proper inspection, then the coating shallbe stripped. If the coating has been removed by theapplication of heat, in no case shall the temperatureof the cylinder have exceeded 300C.

7.2 Inspection Procedure

The external surface of each cylinder shall beinspected for:

a) Dents, cuts, gouges, bulges, cracks,laminations, or excessive base wear,

b) Heat damage, plug or neck inserts or electricarc, suspicious marks, etc (see Table 3).

c) Corrosion (see Table 4) - Special attentionshall be given to areas where water may be

IS 8451 : 2009

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trapped. These include the entire base area,the junction between the body and the footring and the junction between the body andshroud,

d) Other defects such as illegible or incorrect,unauthorized stamp marking, or unauthorizedadditions or modifications,

e) Integrity of all permanent attachments (seeC-2);and

f) Vertical stability, if relevant (seeC-2).

For rejection criteria, see Annex C. Cylinders nolonger suitable for future service shall be renderedunserviceable (see 15).

8 CHECKOFINTERNALCONDITION

Cylinders shall be inspected internally to completeperiodic and testing requirements. For cylindersbeing inspected by the ultrasonic method in lieu ofthe pressure test and when reference notches areused for calibration, the valve need not be removed.

Otherwise, each cylinder shall be inspected internallyusing adequate illumination to identify any defectssimilar to those listed in 7.2(a) and 7.2(c). Precautionshall be taken to ensure that the method ofillumination presents no risks to the tester whileperforming the operation. Any internal liner orcoating that may obstruct optimum visual inspectionshall be removed. Any cylinder showing presence offoreign matter or signs of more than light surfacecorrosion shall be cleaned internally under closelycontrolled conditions by shot blasting, water jetabrasive cleaning, flailing, steam jet, hot water jet,rumbling, chemical cleaning or other suitable method.The method used to clean the cylinder shall bevalidated, controlled process. Care shall be taken alltimes to avoid damaging the cylinder or removingexcess amounts of cylinder wall (see Annex C). Ifcleaning is required, the cylinder shall be re-inspected after the cleaning operation.

For the cylinder of non-corrosive gases and < 0.5litre water capacity with an internal neck diameter< 9 mm, alternative method may be substituted forthe internal visual inspection.

This is:

Looking for contamination, for example, rust fromthe water used after the hydraulic test. If the rustcontamination is observed in the hydraulic test fluid,the cylinder shall be rendered unserviceable.

9 SUPPLEMENTARY TEST

Where there is doubt concerning the type and/orseverity of a defect found on visual inspection,additional tests or methods of examination may beapplied, ultrasonic techniques, check weighing, or

other non-destructing tests. Only when all doubtsare eliminated; may the cylinder be further processed(seeAnnex C).

10 INSPECTIONOFCYLINDERNECK

10.1 Cylinder to Valve Threads

When the valve is removed, the cylinder to valvethreads shall be examined to identify the type ofthread and to ensure that they are:

a) Clean and of full form,b) Free of damages,c) Free of burrs,d) Free of cracks, ande) Free of other imperfections.

Cracks manifest themselves as lines that runvertically down the thread and across the threadfaces. They should not be confused with tap marks(thread machining stop marks). Special attentionshould be paid to the bottom of the threads. Inaddition threads shall be checked by a GO, NO GOgauge.

10.2 Other Neck Surfaces

Other surfaces of the neck shall also be examined toensure they are free of cracks or other defects (seeAnnex C).

10.3 Damaged Internal Neck Thread

Where necessary and where the manufacturer or thecompetent design authority confirms that the designof the neck permits, threads may be retapped or thethread type changed to provide the appropriatenumber of effective threads. After retapping orchanging thread form, the threads shall be checkedwith the appropriate thread gauge (see IS 9122).

10.4 Neck Ring and CollarAttachment

When a neck ring/collar is attached, an examinationshall be carried out to ensure that it is secure toinspect for thread damage. A neck ring shall only bechanged using an appropriate procedure. If it isfound that any significant damage to cylinder materialhas occurred by replacement of the neck ring/collar,the cylinder shall be rendered unserviceable (see 15).

11 PRESSURE TEST OR ULTRASONICEXAMINATION

11.1 General

Each cylinder shall be subjected to hydraulic pressuretest. Alternatively ultrasonic examination may beconsidered subject to approval of statutory authority.WARNING ó Take appropriate measures to ensure safeoperation and to contain any energy that may be releasedduring the hydraulic test. It should be noted that pneumatic

IS 8451 : 2009

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pressure test requires more precautions than hydraulicpressure tests since, regardless of the size of the container;any error in carrying out this test is highly likely to leadto a rupture under gas pressure. Therefore these tests shouldonly be carried out after ensuring that the safety measuressatisfy the safety requirements.

Each cylinder subjected to a hydraulic pressure testshall use a suitable fluid, normally water, as the testmedium. Hydraulic pressure test may be a proofpressure test or a volumetric expansion test asappropriate to the design specification of thecylinder. The hydraulic proof pressure test may bereplaced by a pneumatic proof pressure test. Havingdecided to use one particular type of test, its resultswill be final. The test pressure shall be in accordancewith the stamp markings on the cylinder.

Once a cylinder has failed one of the above mentionedtests, none of the other test methods shall be appliedto approve the cylinder.

11.2 Proof Pressure Test

The hydraulic pressure in the cylinder shall beincreased at a controlled rate until the test pressure,Ph, is reached. The cylinder shall remain under

pressure Phfor at least 30 s to establish that the

pressure does not fall and that there are no leaks.

NOTE ó Any cylinder fai l ing to comply with therequirement of proof pressure test shall be renderedunserviceable.

11.3 Hydraulic Volumetric Expansion Test

Annex E proposes a typical method for carrying outthe test and gives details for determining thevolumetric expansion of seamless steel gas cylinderby the preferred water jacket method or the non-water jacket method.

The permanent volumetric expansion of the cylinderexpressed as a percentage of the total expansion attest pressure shall not exceed the percentage givenin the design specification or 10 percent whicheveris lower after the cylinder has been held at testpressure for a minimum period of 30 s. The cylindershall be rendered unserviceable.

11.4 Ultrasonic Examination

11.4.1 Scope

This is based on techniques used by cylindermanufacturers. Other techniques of ultrasonicinspection may be used, provided these have beendemonstrated to be suitable for the manufacturingmethod.

11.4.2 General Requirements

The ultrasonic testing equipment shall be capable ofat least detecting the reference standard as described

in 11.4.3.2. It shall be serviced regularly in accordancewith the manufacturerís operating instructions toensure that its accuracy is maintained. Inspectionrecords and approval certificates for the equipmentshall be maintained.

The operation of the test equipment shall be bytrained personnel and supervised by qualified andexperienced certified personnel.

The inner and outer surface of any cylinder which isto be tested ultrasonically shall be in a conditionsuitable for an accurate and reproducible test.

For flaw detection the pulse echo system shall beused. For thickness measurement either theresonance method or the pulse echo system shall beused. Either contact or immersion techniques oftesting shall be used.

A coupling method which ensures adequatetransmission of ultrasonic energy between thetesting probe and the cylinder shall be used.

11.4.3 Flaw Detection of the Cylindrical Parts

11.4.3.1 Procedure

The cylinder to be inspected and the search unit shallhave a rotating motion and translation relative toone another such that a helical scan of the cylinderwill be described. The velocity of rotation andtranslation shall be constant within ±10 percent. Thepitch of the helix shall be less than the width coveredby the probe (at least 10 percent overlap shall beguaranteed) and be related to the effective beamwidth such as to ensure 100 percent coverage at thevelocity of rotational movement and a translationused during the calibration procedure.

An alternative scanning method may be used fortransverse defect detection in which the scanningor relative movement of the probes and the workpiece is longitudinal, the sweeping motion being suchas to ensure 100 percent surface coverage with about10 percent overlap of the seeps.

The cylinder wall shall be tested for longitudinaldefects with the ultrasonic energy transmitted inboth circumferential directions and for transversedefects in both longitudinal directions.

For concave base cylinders where hydrogenembrittlement or stress corrosion may occur, thetransition region between the cylindrical part andthe cylinder base shall also be tested for transversedefects in the directions of the base. For the area tobe considered (see Fig. 1). The ultrasonic sensitivityshall be set at + 6 dB in order to improve the detectionof defects equivalent to 5 percent of the cylindricalwall thickness in this thickened portion.

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In this case or when optional testing if carried outon the transition area between the wall and neckand/or wall and base, this may be conductedmanually, if not carried out automatically.

The effectiveness of the equipment shall beperiodically checked by passing a reference standardthrough the test procedure. This check shall becarried out at least at the beginning and end of eachshift. If during this check the presence of theappropriate reference notch is not detected then allcylinders tested subsequent to the test acceptablecheck shall be retested after the equipment has beenreset.

11.4.3.2 Reference standard

A reference standard of convenient length shall beprepared from a cylinder of similar diameter and wallthickness range and from material with the sameacoustic characteristics (subjected to the same heattreatment) and surface finish as the cylinder to beinspected. The reference standard shall be free fromdiscontinuities which may interfere with the detectionof the reference notches.

Reference notches, both longitudinal andtransverse, shall be machined on the outer and innersurface of the standard. The notches shall beseparated such that each notch can be clearlyidentified.

Dimensions and shape of notches are of crucialimportance for the adjustment of the equipment.(see Fig. 2 and Fig. 3).

The length of the notches (E) shall not be greaterthan 50 mm.

The width (W) shall be not greater than twice the

nominal depth (T). However, where this conditioncannot be met a maximum width of 1.0 mm isacceptable.

The depth of the notches (T) shall be (5 ± 0.75)percent of the nominal wall thickness (S) with aminimum of 0.2 mm and a maximum of 1.0 mm, overthe full length of the notch. Run-out at each end ispermissible.

The notch shall be sharp edged at its intersectionwith the surface of the cylinder wall. The cross-section of the notch shall be rectangular except wherespark erosion machining methods are used; then itis acknowledged that the bottom of the notch shallbe rounded.

11.4.3.3 Calibration of equipment

Using the reference standard described in 11.4.3.2,the equipment shall be adjusted to produce clearlyidentifiable indications from inner and outer surfacenotches. The amplitude of the indications shall beas near equal as possible. The indication of thesmallest amplitude shall be used as the rejection leveland for setting visual, audible, recording or sortingdevices. The equipment shall be calibrated with thereference standard or probe, or both, moving in thesame manner, in the same direction and at the samespeed as will be used during the inspection of thecylinder. All visual, audible, recording or sortingdevices shall operate satisfactorily at the test speed.

11.4.4 Wall Thickness Measurement

If the measurement of the wall thickness is not carriedout in another stage of production, the cylindrical partshall be 100 percent examined to ensure that thethickness is not less than the guaranteed minimumvalue.

FIG. 1 BASE/WALL TRANSITION REGION

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NOTE

T (5 ± 0.75) % S but 0.2 mm T 1 mmW 2 T, but if not possible then W 1 mm

E 50 mm

FIG. 3 SCHEMATIC REFERENCE NOTCHES FOR CIRCUMFERENTIAL DEFECTS

KEY

1 External Reference Notch

2 Internal Reference Notch

NOTE

T (5 ± 0.75) % S but 1 mm and 0.2 mmW 2 T but if not possible then W 1 mmE 50 mm

FIG. 2 SCHEMATIC REFERENCE NOTCHES FOR LONGITUDINAL DEFECTS

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11.4.5 Interpretation of Results

Cylinders with indications which are equal to orgreater than the lowest of the indications from thereference notches shall be withdrawn. Surfacedefects may be removed; after removal the cylindersshall be subjected to ultrasonic flow detection andthickness measurement.

Any cylinder which is shown to be below theguaranteed minimum wall thickness shall be rejected.

11.4.6 Certification

The ultrasonic testing shall be certified by thecylinder manufacturer.

Every cylinder, which has passed ultrasonic testingin accordance with this specification shall be stampmarked with the symbol ‘UT’.

12 INSPECTION OF VALVES AND OTHERACCESSORIES

If valve or any other accessory is to be reintroducedinto service, it shall be inspected and maintained toensure that it will perform satisfactorily in serviceand meet the requirements of gas tightness from thevalve manufacturing standard, that is IS 3224.

An example of suitable method is given in Annex F.

13 REPLACEMENT OF CYLINDRICAL PARTS

Replacement of foot-rings and neck rings or thegrinding of cuts and other imperfection can be carriedout.

All operations involving application of heat shallconform to the heat limits in 15.1.2. All corrosionproducts shall be removed prior to repair.

14 FINAL OPERATION

14.1 Drying, Cleaning and Painting

14.1.1 Drying and Cleaning

The interior of each cylinder shall be thoroughlydried by a suitable method at a temperature notexceeding 300°C immediately after hydraulic pressuretesting, so there is no trace of free water. The interiorof the cylinder shall be inspected to ensure that it isdry and free from other contaminants.

14.1.2 Painting and Coating

Cylinders are sometimes repainted using paints thatrequire stoving. Plastic coating may also bereapplied. Paint or coating shall be applied so thatall markings stamped on the cylinder remain legible.

In no case shall the temperature of the cylinderexceed 300°C since overheating could change themechanical properties of the cylinder.

Table 1 Permissible Deviation in Tare Weight

S lNo.

Cylinder WaterCapacity (V)

l

MaximumPermissibleDeviation in

TareWeight, g

(3)

±50

±200

±400

(2)

0.5 V < 5.05.0 V 20

V>20

(1)

i)

ii)

iii)

14.4 Retest Marking

14.4.1 General

After satisfactory completion of the periodicinspection and tests, each cylinder shall bepermanently marked according to relevant standardor regulation, for example, IS 7285 (Part 2) with presenttest date, followed by:

‘The symbol of the inspection body or teststation.’

14.4.2 Retest Date and Retester Symbol

The retest date is the date of the present test, whichshall be indicated by the year and month. The retestersymbol is the symbol of the inspection body or teststation.

14.4.3 Stamping

These marks shall be in accordance with the relevantstandard or regulation, for example, IS 7285 (Part 2).

14.2 Revalving of the Cylinder

Before revalving the cylinder, the thread type shallbe identified. The appropriate valve shall be fitted inaccordance with IS 3224/IS 3745 or to any otherspecification approved by the statutory authority.Valving shall be done by a torque wrench at a torqueprescribed by valve manufacturer.

14.3 Check on Cylinder Tare Weight

The tare weight of the cylinders shall be obtained byweighing on a scale calibrated with traceability tonational or international standards. The weigh scaleshall be checked for accuracy on a daily basis. Thecapacity of weighing scale shall be suitable for thetare weight of the appropriate cylinders.

The tare shall include the mass of the cylinder,valve(s) and all permanent fittings as it is presentedfor fittings. If tare weight of the cylinder differs fromthe stamped tare weight by more than the valueshown in Table 1 and is not due to reasons ofdamage, the original tare weight shall be cancelled.The new correct tare weight shall be marked in adurable and legible fashion.

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14.5 Reference to Next Test Date

In accordance with the relevant regulations of anauthorized body and when regulations require, thenext test date may be shown by an appropriatemethod such as by a disc fitted between the valveand the cylinder indicating the date (year and month)of the next periodic inspection and/or tests. Annex Gprovides one example of an existing system forindicating retest dates. Other systems are in use.

14.6 Identification of Contents

Before the cylinder is reintroduced into service, theintended contents shall be identified. This need notbe part of the periodic inspection and test procedure.As an example, use IS 3933 or IS 4379 for colourcoding. If painting is required, care shall be exercisedin accordance with 14.1.2. If a change of gas serviceis involved, care shall be taken to follow therequirement of relevant Indian Standard and as perGas Cylinder Rules, 2004.

14.7 Records

Full record of cylinder examined and tested at anytesting station shall be maintained giving thefollowing particulars, namely:

a) Name of the manufacturer and the owner ofthe cylinder;

b) Serial number;c) The specifications to which the cylinder

conforms;

d) Date of original hydrostatic/hydrostaticstretch test;

e) Test reports and certificates furnished by themanufacturer, if available;

f) Test reports;g) Maximum working pressure;h) Water capacity;j) Tare Weight;k) Variation, if any, in the tare weight marked on

the cylinder and actual tare weight;m) Condition of the cylinder shell;n) Name of gas;p) Type of valve fitted;q) Retesting date; andr) Remarks, if any.

15 REJECTIONANDRENDERINGCYLINDERUNSERVICEABLE

Any cylinder which fails to pass periodic examinationor test or which loses in its tare weight by over 5percent or which for any other defect is found to beunsafe for use or after expiry of the service life of thecylinder, shall not be filled with any compressed gasand shall be destroyed by flattening it as a whole orafter being cut into pieces in such a manner that thepieces cannot again be joined together by weldingor otherwise to form a cylinder, under intimation tothe owner of the cylinder, as specified in IS 8198.

ANNEXA(Foreword)

INSPECTION PERIODSA-1 The periodic inspection interval for gas cylinders containing different gases shall be as follows:

Name ofGas

Acetylene, dissolvedAir, compressedAmmonia (anhydrous or dissolved)ArgonBoron trichlorideBoron trifluoride (boron fluoride)Bromochlorodifluoromethane (R-12B1)1)

Bromotrifluoromethane (R-13B1) 1)

Butadiene (vinylethylene, divinyl)ButaneButene

Chemical Symbolof GasC2H2óNH3ArBCl3BF3

CClF2BrCBrF3C4H6C4H10C4H8

Periodical InspectionInterval (inYears)(See Notes)

5252255555

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Carbogen (O2 = 95 percent, CO2 = 5 percentby weight)

Carbon dioxideCarbon monoxideChlorineChlorine trifluorideChlorine pentafluorideChlorodifluoromethane (R-22) 1)

2-Chlorotrifluoroethane (R-133a)1)

Chlorotrifluoroethane (R-1113)1)

Chlorotrifluoromethane (R-13)1)

Coal gas (town gas, lighting gas)CyanogenCyanogen chlorideCyclopropaneDiborane (boroethane)Dichlorodifluoromethane (R-12)1)

Dichlorofluoromethane (R-21) 1)

1.2 Dichlorotetrafluoroethane (R-114) 1)

1.1 Difluoroethane (R-152a)1)

1.1 Difluoroethane (R-1132a) 1)

DimethylamineDimethyl ether (methyl ether, methyl oxide)DimethylpropaneEthaneEthylamine (aminoethane)Ethyl chloride (chloroethane)EthyleneEthylene oxideFluorineHeliumHydrogenHydrogen bromideHydrogen chlorideHydrogen cyanideHydrogen fluorideHydrogen sulphideIsobutaneIsobutyleneKryptonLiquefied petroleum gas (LPG) 2)

MethaneMethanethiol (methylmercaptan)Methyl acetylene

O2 + CO2

CO2COCl 2ClF3ClF5CHClF2CH2ClCF3CClF = CF2CClF3

H2 + CO + CH4(CN)2ClCNC3H6B2H6CCl2F2CHCl2F

CClF2CClF2CH3CHF2CH2=CF2(CH3)2NH(CH3)2OC5H12C2H6

C2H5NH2C2H5ClC2H4C2H4OF2HeH2HBrHClHCNHFH2S

CH(CH3)3CH2=C(CH3)2

KróCH4CH3SH

CH3C =CH

5

522225555222525555555555552255222225555525

Name ofGas Chemical Symbolof Gas

Periodical InspectionInterval (inYears)

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10

Methylamine (amino methane)Methyl bromide (bromomethane)Methyl chloride (chloromethane)Methyl fluorideMonochlorodifluoroethane (R-142b) 1)

Monochlorotetrafluoroethane (R-124a)1)

NeonNitrogenNitrogen peroxide (nitrogen dioxide)Nitrogen tetroxide (dinitrogen tetroxide)Nitrosyl chlorideNitrous oxideNitroxOctafluorocyclobutane (R-C318)

1)

Oil gas, compressedOil gas, liquefied (Z ñ gas)OxygenPhosgene (carbonyl chloride)PropanePropene (propylene)Sulphur dioxideSulphur hexafluorideT-gas 28T-gas 250 (cartox)Trichlorofluoromethane (R-11)1)

1.1.2 Trichlorotrifluoroethane (R-113)1)

TrifluoromethaneTrifluoromonobromomethaneTrimethylamineVinyl bromideVinyl chlorideVinyl methylether (methylvinyl oxide)Water gasXenon

CH3NH2CH3BrCH3ClCH3F

CH3CClF2CHF2ClCF2

NeN2NO2N2O4NOClN2OóC4F8

CO+CmHnCO+CmHnO2COCl2C3H8C3H6SO2SF6

10 percent CO2 + 90 percent C2H4O90 percent CO2 + 10 percent C2H4O

CCl3FCCl2FCClF2CHF3CF3Br(CH3)3NCH2= CHBrCH2= CHCl

CH3OCH = CH2H2 +COXe

2225555522255522525525255555555225

Name ofGas Chemical Symbolof Gas

Periodical InspectionInterval (inYears)

NOTES1 Dissolved acetylene gas cylinders having monolithic porous mass shall be subjected to periodical inspection once in twoyears and those having loose mass once in a year. It may be noted that dissolved acetylene gas cylinders are not subjected tohydrostatic testing at the time of periodical inspection.2 This list contains low pressure liquefiable gases, high pressure liquefiable gas and permanent gases.

1) IS 10609.2) First periodic inspection after 10 years and thereafter every 5 years.

IS 8451 : 2009

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ANNEX B(Foreword)

LIST OF GASES CORROSIVE TO CYLINDER MATERIAL

Gas Name Chemical Formula UN Class Subsidiary Risk or Division

Boron trichloride BCl3 2.3 8

Boron trifluoride BF3 2.3 8

Chlorine Cl2 2.3 8

Dichlorosilane SiH2Cl2 2.3 2.1, 8

Fluorine F2 2.3 5.1, 8

Hydrogen bromide HBr 2.3 8

Hydrogen chloride HCl 2.3 8

Hydrogen cyanide HCN 6.1 3

Hydrogen fluoride HF 8 6.1

Hydrogen iodide HI 2.3 8

Methylbromide CH3Br (R40B1) 2.3

Nitric oxide NO 2.3 5.1, 8

Nitrogen dioxide N2O4 2.3 5.1, 8

Phosgene COCl2 2.3 8

Silicon tetrachloride SiCl4 8

Silicon tetrafluoride SiF4 2.3 8

Sulphur tetrafluoride SF4 2.3 8

Trichlorosilane SiHCl3 4.3 3,8

Tungsten hexafluoride WF6 2.3 8

Vinyl bromide CH2 : CHBr (R1140B1) 2.1

Vinyl chloride CH2 : CHCl (R1140) 2.1

Vinyl bromide C2H3F (R1141) 2.1

NOTES1 These gases in a pure form are recognized to be potentially corrosive to low alloy steels.2 Mixtures containing these gases may not be corrosive.

IS 8451 : 2009

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C-1 GENERAL

Gas cylinder defects may be physical, material or dueto corrosion as a result of environmental or serviceconditions to which the cylinders have beensubjected during its life.

The object of this annexure is to give generalguidelines to gas cylinder users as to the applicationof rejection criteria.

This annexure applies to all cylinders, but those that

ANNEXC(Foreword; and Clauses 7.1, 7.2, 8, 9 and 10.2)

DESCRIPTION, EVALUATION OF DEFECTS AND CONDITIONS FOR REJECTION OFSEAMLESS STEEL GAS CYLINDER AT TIME OF VISUAL INSPECTION

have contained gases having special characteristicsmay require modified controls.

Any defects in the form of a sharp notch may beremoved by grinding, machining or other approvedmethods.After such a repair, the wall thickness shallbe checked, for example, ultrasonically.

C-2 PHYSICAL OR MATERIAL DEFECTS

Evaluation of physical or material defects shall be inaccordance with Table 3.

Table 3 Rejection Limits Relating to Physical and Material Defects in the Cylinder Shell[Clauses 7.2(b) and C-2]

Sl No. Type of Defects Definition Rejection Limit in Accordance with Clause 71)

(1) (2) (3) (4)i) Bulge Visible swelling of the cylinder All cylinders with such a defect

ii) Dent A depression in the cylinder When the depth of the dent exceeds 3 percent of thethat has neither penetrated nor external diameter of the cylinderremoved metal and is greater in ordepth than 1 percent of the outside when the diameter of the dent is less than 15 timesexternal diameter its depth

iii) Cut or gouge A sharp impression where metal When the depth of the cut or gouge exceed 10 percenthas been removed or redistributed of the wall thicknessand whose depth exceeds 5 percent orof the cylinder wall thickness (see When the length exceeds 25 percent of the outsideFig. 4) diameter of the cylinder

orWhen the wall thickness is less than the minimumdesign thickness

iv) Crack Split or a rift in the metal (see All cylinders with such defectsFig. 5)

v) Damage Excessive general or localized All cylinders in categories (a) and (b)heating of a cylinder usuallyindicated by: All cylinders in categories (c) and (d) may be acceptablea) partial melting of the cylinder after inspection and/or testing.b) distortion of the cylinderc) charring or burning of paintd) fire damage to valve, meltingof plastic guard or data ringor fusible plug, if fitted

vi) Plug or neck Additional inserts fitted in the All cylinders unless it can be clearly established thatinserts cylinder neck, base or wall addition is a part of approved design

vii) Stamping Marking by means of a metal All cylinders with illegible, modified or incorrectpunch markings

viii) Arc or torch Partial melting of the cylinder, All cylinders with such defectsburns the addition of weld metal or the

removal of metal by scarfingor cratering

ix) Suspicious marks Marks introduced other than by All cylinders with such defectsthe cylinder manufacturing processand approved

x) Vertical stability ó Deviation from verticality which may present a riskduring service (especially if fitted with foot ring)

1) When applying the rejection criteria given in this table, the conditions of use of the cylinders, the severity of the defects andsafety factors in the design shall be taken into consideration.

IS 8451 : 2009

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Permanent attachments (for example foot rings orshrouds) shall be inspected and shall be suitable forthese intended purposes.

C-3 CORROSION

C-3.1 General

The cylinder may be subjected to the environmentalconditions that could cause external corrosion of themetal.

Internal corrosion of the metal may also occur owing toservice conditions.

There is difficulty in presenting definite rejection limits

in tabular form for all sizes and types of cylinders andtheir service conditions. The limits of rejection areusually established following considerable fieldexperience.

Extensive experience and judgement are required inevaluating whether cylinders that have corrodedinternally are safe and suitable for return to service. It isimportant that the surface of the metal is clean ofcorrosion products prior to the inspection of thecylinder.

C-3.2 Types ofCorrosion

The types of corrosion generally may be classified asin Table 4.

Table 4 RejectionCriteria forCorrosion of theCylinderValve(Clauses 7.2(c) and C-3.2)

Sl No. Type of Corrosion Definition Rejection Limit in Accordance with Clause 71)

(1) (2) (3) (4)i) General corrosion Loss of wall thickness over an If the original surface of the metal is no longer

area of more than 20 percent of recognizableeither the interior or exterior total orsurface area of the cylinder If the depth of penetration exceeds 10 percent of the(see Fig. 6) original thickness of wall

orIf the wall thickness is less than the minimum designedwall thickness

ii) Local corrosion Loss of wall thickness over an If the depth of penetration exceeds 20 percent of thearea of less than 20 percent of original thickness of the cylinder walleither the interior or exterior ortotal surface area of the cylinder, If the wall thickness is less than the designed thickness2)except for the other types of localcorrosion described below

iii) Chain pitting or Corrosion forming, a narrow If a total length of corrosion in any direction exceedsline corrosion longitudinal or circumferential the diameter of the cylinder and the depth exceeds 10

line or strip or isolated craters or percent of the original wall thickness2)pits which are almost connected or(see Fig. 7) If the wall thickness is less than the designed thickness2)

iv) Isolated pits Corrosion forming isolated If the diameter of the pits is greater than 5 mm, refer tocraters, without significant the ëlocal corrosioní row.alignment (see Fig. 8) If the diameter of the pits is less than 5 mm, the latter,

the cylinder should be assessed as carefully as possible inorder to check that the remaining thickness of the wallor base is adequate for the intended use of the cylinder

v) Crevice corrosion Corrosion associated with taking If, after thorough cleaning, the depth of penetrationplace in, or immediate exceeds 20 percent of the original wall thicknessaround, an aperture

1) When applying the rejection criteria given in Table 3, the conditions of use of the cylinders, the severtity of the defects and safetyfactors in the design shall be taken into consideration.

2) If corrosion has reached limits of depth or extent, the remaining wall thickness shall be checked with an ultrasonic device. Thewall thickness may be less than the minimum design wall thickness, that is small (depth and extent) isolated pits (see Fig. 8), whereauthorized by the relevant regulations taking into consideration the severity of the defect and safety factors.

IS 8451 : 2009

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FIG. 4 CUT OR GROOVE

FIG. 5 CRACK

FIG. 6 GENERAL CORROSION

FIG. 7 CHANNEL (LINE) CORROSION

IS 8451 : 2009

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FIG. 8 ISOLATED PITS

ANNEX D(Foreword)(Informative)

PROCEDURE TO BE ADOPTED WHEN DEVALVING AND WHEN IT ISSUSPECTED THAT A CYLINDER VALVE IS OBSTRUCTED

D-1 CHECK FOR OBSTRUCTED VALVE

The following procedures shall be carried out onlyby trained personnel. In view of the potential of thehazards in cylinders, this operation can lead to injuryfrom stored energy release, fire and toxic hazards,hence personnel can take such precautions asdeemed necessary for the work to be performed.When the gas, if any, has been released and thepressure within the cylinder reduced to atmosphericpressure, and, in the case of liquefied gases, whenthere is no frost or dew on the outside of the cylinder,the valve may be removed after an additional checkis made to establish that there is free passage throughthe valve.

As indicated in 6, a systematic check shall be madeto establish that the passage through the valve isunobstructed. The method adopted shall be arecognized procedure such as one of the followingor one that provide equivalent safeguards:a) By introducing gas at a pressure up to 5 bar

and checking its discharge;b) By using device shown in Fig. 9 to hand pump

air into the cylinder; andc) For cylinder of liquefied gases, first check to

establish that the total weight of the cylinderis the same as the tare stamped on the cylinder,if there is a positive difference, the cylindermay contain either liquefied gas underpressure or contaminants. Lack of a positive

difference does not rule out the presence of agas under pressure.

D-2 VALVE UNOBSTRUCTED

Only when it is established that there is noobstruction to gas flow in the cylinder valve, thevalve may be removed.

D-3 VALVE OBSTRUCTED

When a cylinder is found to have an obstructed gaspassage in the valve, the cylinder shall be set asideand handled by specially trained personnel in thistask as follows:a) By sawing or drilling the valve body until

interception is made with the gas passagebetween the valve body stem and valve bodyspindle seat. The operation shall be properlycooled particularly when handling oxidizinggases; and

b) By loosening or piercing the pressure reliefdevice in a controlled manner.

The preceding methods are applicable for cylindersof non-toxic, non-flammable and non-chlorofluorocarbon (CFC) gases. Appropriate safetyprecautions should be taken to ensure that no hazardresults from the uncontrolled discharge of anyresidual gas.

Where the contents are toxic, flammable, oxidizingor CFC, the preferred method is to partially unscrew

IS 8451 : 2009

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the valve within a glanded cap, secured and joinedto the cylinder and vented to a safe discharge.The principals of a suitable device are illustrated inFig. 10.

This procedure shall be performed in a controlledmanner in such a way as to avoid personal injury.

KEY1 Rubber tube (internal diameter 8 mm, external diameter 13 mm)ground to olive shape and bonded

2 Tube (internal diameter 3 mm, external diameter 8 mm)3 Rubber bulb4 Bonded

5 Hand pressure

All dimensions in millimetres.

FIG. 9 TYPICAL DEVICE FOR DETECTING OBSTRUCTED CYLINDER VALVE

IS 8451 : 2009

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KEY1 Drive for devalving machine2 Gas-tight gland3 Gas-tight seal4 Cylinder frame and clamping device5 Pressure gauge6 Vent valve7 Direction of rotation

8 Gas disposal system

NOTE ó Operate remotely using devalving machine.

All dimensions in millimetres.

FIG. 10 TYPICAL DEVICE FOR THE REMOVAL OF A DAMAGED GAS CYLINDER VALVE

IS 8451 : 2009

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ANNEXE(Foreword; andClause 11.3)

(Informative)

VOLUMETRIC EXPANSION TESTING OF GAS CYLINDERS

E-1 GENERAL

This annex describes methods for the hydrostaticstretch testing of cylinders intended for the storageand transport of compressed gases. Two methods,namely, water jacket method and non-jacket method,have been covered.

E-2 WATER JACKET METHOD

E-2.1 Apparatus

The arrangement of apparatus for the test may be ofthe type indicated in Fig. 11.

E-2.1.1 Graduated Tube

The graduated tube used for the measurement shallbe of such diameter that a permanent change involume of the cylinder of the order of 1/20 000 thetotal cylinder capacity may be readily observed. Also

the length of tube shall be such that its capacityexceeds the total volumetric expansion of the cylinderunder test. The diameter shall be uniform andsufficiently small to permit an accurate reading ofthe expansion.

E-2.1.2 Pressure Gauge

Two pressure gauges or a duplicate gauge shall beused and shall be capable of reading to within onepercent of the test pressure for pressures up to andincluding 15 kgf/cm and within two percent forpressures above 15 kgf/cm.

E-2.2 Procedure Before Testing

The water jacket shall be filled with water to aconvenient level on the graduated glass tube. Alsoarrangement for expelling entrapped from the waterjacket shall be made.

FIG. 11 WATER JACKET METHOD

IS 8451 : 2009

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E-2.3 Precautions

Care shall be taken to prevent any leakage throughthe joint between the cylinder neck and the waterjacket cover. Change of temperature of the water inthe jacket during the test shall be avoided.

E-2.4 Readings

Reading of the water level in the graduated tube shallbe taken:

a) before the test pressure has been applied tothe cylinder (C1),

b) after the test pressure has been applied for 30s (C2), and

c) after the release of the test pressure (C3).

The difference between C1 and C2 represents the totalvolumetric expansion and the difference between C1and C3 represents the permanent expansion.

E-3 NON-JACKETMETHOD

E-3.1 Apparatus

The arrangement of apparatus for the test may be ofthe type indicated in Fig. 12.

E-3.1.1 Graduated Tube

The graduated tube used for the measurement shallbe of such diameter that a permanent change involume of the cylinder of the order of 1/20 000 thetotal cylinder capacity may be readily observed. Alsothe length of tube shall be such that its capacityexceeds the total volumetric expansion of the cylinderunder test. The diameter shall be uniform and

sufficiently small to permit an accurate reading ofthe expansion.

E-3.1.2 Pressure Gauge

Two pressure gauges or a duplicate gauge shall beused and shall be capable of reading to within onepercent of the test pressure for pressure up to andincluding 15kgf/cm and within two percent forpressure above 15kgf/cm.

E-3.2 Procedure Before Testing

Before connections are made for testing, the cylindershall be completely filled with water and alsoarrangement for expelling entrapped air from thecylinder shall be made.

E-3.3 Connections

All connections shall be air-free and water tight.

E-3.4 Precautions

The water used shall be air free and the joints shallbe leak proof as far as possible. However, if necessary,care shall be taken to ensure that the quantity ofwater in the system is always constant by returningany water leaking past the joints to the system.Piping shall be as short as possible and of as small avolume as practicable. Pump shall be of sufficientcapacity to build the required pressure in a reasonableperiod of time.

E-3.5 Readings

A reading (C1) of the water level in the graduatedtube shall be taken when the apparatus has been

FIG. 12 NON-JACKET METHOD

IS 8451 : 2009

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completely filled with air-free water and the valve tothe water supply has been closed.

E-3.5.1 After the test pressure has been applied for30 s, a second reading (C2) of the water level shall betaken.A final reading (C3) shall be taken after removalof the internal pressure by opening the release valve.

E-3.5.2 The difference between C1 and C2 representsthe total volumetric expansion. However, the

apparent total volumetric expansion calculated in thismanner needs to be corrected by deducting anamount equal to 4.12 10-5 PV, where P is the testpressure in kgf/cm and V is the volume of waterunder compression in cm. The difference betweenC1 and C3 represents the permanent volumetricexpansion without the necessity of correcting forthe compressibility of water.

F-1All threads shall be checked to ensure that the threaddiameters, form, length, and taper are satisfactory.

If threads show sign of distortion, deformation orburring, these faults shall be rectified. Excessive threaddamage or the serious deformation of the valve body,handwheel, spindle or other components is the causefor replacement.

Maintenance of the valve shall include general cleaningtogether with replacement of elastomers and worn ordamaged components, packing and safety devices,

ANNEX F(Foreword; and Clause 12)

INSPECTION AND MAINTENANCE OF VALVESAND THEIR JUNCTIONSóRECOMMENDED PROCEDURES

where necessary.

Where the use of lubricants/elastomers is permitted,only those approved for the gas service shall be used,particularly for oxidizing gas service.

After the valve has been reassembled, it shall be checkedfor correct operation and shall undergo internal andexternal leak checks at intended operating pressure. Thismay be done prior to the valve being refitted to thecylinder or during and after the first gas changesubsequent to the inspection and test of the cylinder.

IS 8451 : 2009

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ANNEXG(Clause 14.5)

TEST DATE RINGS FOR GAS CYLINDERS

Year Colour Shape(1) (2) (3)2000 Aluminium Circle2001 Red Hexagon2002 Blue Hexagon2003 Yellow Hexagon2004 Green Hexagon2005 Black Hexagon2006 Aluminium Hexagon

2007 Red Square2008 Blue Square2009 Yellow Square2010 Green Square2011 Black Square2012 Aluminium Square

2013 Red Circle2014 Blue Circle2015 Yellow Circle2016 Green Circle2017 Black Circle2018 Aluminium Circle

2019 Red Hexagon2020 Blue Hexagon2021 Yellow Hexagon2022 Green Hexagon2023 Black Hexagon2024 Aluminium Hexagon

NOTES1 Colour and shape of test date ring on cylinders to be tested during the year indicated in column.2 The sequence of colour and shape of test date rings is to be repeated on an 18-year cycle. Hence 2018 is a repeal of 2000.

IS 8451 : 2009

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Organization Representative(s)

Petroleum and Explosive Safety Organization, Nagpur SHRI M. ANBUNATHAN (Chairman)SHRI C. R. SURENDRANATHAN (Alternate)

All India Industrial Gases Manufacturers Association, New Delhi SHRI SIDDARTHA. PATELSHRI S. DEB (Alternate)

Bharat Petroleum Corporation Ltd, Mumbai SHRI THARIYANGEORGESHRI SANJAY PHULLI (Alternate)

Bharat Pumps and Compressors Ltd, Allahabad SHRI J. P. SINHASHRI P. G. CHOUDHURY (Alternate)

BOC India Ltd, Kolkata SHRI K.MANOHARANSHRI RAMANAVUTUKURU (Alternate)

Everest Kanto Cylinder Ltd, Mumbai SHRI A. K. PARIKHSHRI P. M. SAMVATSAR (Alternate)

Hindustan Petroleum Corporation Ltd, Mumbai SHRI K. SRINIVASSHRIALOK KUMAR GUPTA (Alternate)

Indian Oil Corporation Ltd, Mumbai SHRI S. S. SAMANTSHRI RAJESH HAZARNIS (Alternate)

International Industrial Gases Ltd, Kolkata SHRI DEVENDRAK. GARGSHRI NIKHILESh K. GARG (Alternate)

Kabsons Gas Equipments Ltd, Hyderabad SHRI SATISHKABRASHRI S. GOPALAIAH (Alternate)

Kosan Industries Ltd, Mumbai/Surat SHRI S. K. DEY (Surat)SHRI S. B. BOMAL (Alternate)

LPG Equipment Research Centre, Bangalore SHRI G. P. GUPTA

Mahanagar Gas Limited, Mumbai SHRI RAJESH PRABHUSHRI SUSHIL PATIL (Alternate)

Maruti Koatsu Cylinders Ltd, Mumbai SHRI NITIN J. THAKKARSHRI A. S. SARAN (Alternate)

Ministry of Defence (DGQA), Pune COLM. S. KATTILT-COL RAVI KUMAR (Alternate)

Praxair India Ltd, Bangalore SHRI MILAN SARKARSHRI ARINDAM DAS (Alternate)

Research & Development Establishment (Engineers), Pune SHRI P. K. CHATTOPADHYAYSHRI A. BASU (Alternate)

Sakha Engineers Pvt Ltd, New Delhi SHRI AMARJIT S.KOHLI

SICGIL India Ltd, Chennai SHRI FAROOQUE DADABHOYSHRI R. PADMANABAN (Alternate)

Steel Authority of India Ltd, Salem/Delhi SHRI T. KALYANASUNDARAMSHRI N. K. VIJAYAVARGIA (Alternate)

Supreme Cylinders Ltd, Delhi SHRIM. L. FATHEPURIA

Tekno Valves, Kolkata SHRI Y. K. BEHANISHRI R. BEHANI (Alternate)

ANNEXH(Foreword)

COMMITTEECOMPOSITIONGasCylinders Sectional Committee,MED16

IS 8451 : 2009

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Trans Valves (India) Pvt Ltd, Hyderabad SHRIA. K. JAINSHRI ANUJ JAIN (Alternate)

Vanaz Engineers Ltd, Pune SHRI S. K. KHANDEKARSHRI S. R. SARVATE (Alternate)

In personal capacity (Menon & Patel, 14/1, Mile, SHRI EBRAHIMM. PATELMathura Road, Faridabad)

In personal capacity (303, Shantikunj, Pandav SHRI L. D. THAKKARBunglows Lane Athwalines, Surat)

BIS Directorate General Scientist ëFí & Head (MED)[Representing Director General (Ex-officio)]

Member SecretarySHRI C. K. VEDA

SCIENTIST ëFí & HEAD (MED), BIS

Organization Representative(s)

DissolvedAcetylene Cylinders, Generators, Acetylene Pipe Lines and High PressureGas Cylinders Subcommittee,MED 16 : 3

Petroleum and Explosive Safety Organization, Nagpur SHRI C. R. SURENDRANATHAN (Convener)SHRI V. B. BORGAONKAR (Alternate)

Al-Can Exports Pvt Ltd, Dist Thane SHRIVIJAYK. PARIKHSHRI D. C. DAVE (Alternate)

All India Industrial Gases Manufacturers Association, New Delhi SHRI SIDDARTHA. PATELSHRI S. DEB (Alternate)

Bharat Pumps and Compressors Ltd, Allahabad SHRI J. P. SINHASHRI P. G. CHOUDHURY (Alternate)

BOC India Ltd, Kolkata SHRI P. K. BHATTACHARYASHRI D. MUKHERJEE (Alternate)

Everest Kanto Cylinder Ltd, Mumbai SHRI A. K. PARIKHSHRI P. M. SAMVATSAR (Alternate)

Hindalco Industries Limited, Mumbai SHRI SUBHANKARGUPTASHRI S. DEVADOSS (Alternate)

International Industrial Gases Ltd, Howrah SHRI DEVENDRAK. GARGSHRI NIKHILESH GARG (Alternate)

Jai Maruti Gas Cylinders Gases Ltd, Gwalior SHRIASHOKK. NIGAMSHRI VAISHNAV NIGAM (Alternate)

Klas Technology Ventures Ltd, Bangalore SHRI K. G. KRISHNAMURTHYSHRI K. J. KULKARNI (Alternate)

KVK Corporation, Mumbai SHRIR.CHANDGOTHIASHRI V. CHANDGOTHIA (Alternate)

Mahanagar Gas Limited, Mumbai SHRI RAJESH PRABHUSHRI SUSHIL PATIL (Alternate)

Maruti Koatsu Cylinders Ltd, Mumbai SHRI NITIN J. THAKKARSHRI A. S. SARAN (Alternate)

Ministry of Defence (DGQA), Pune COLM. S. KATTILT-COL RAVI KUMAR (Alternate)

Praxair India Ltd, Bangalore SHRIMILANSARKARSHRI ARINDAM DAS (Alternate)

Rama Cylinders Pvt Ltd, Mumbai SHRI SANJAYR.NAPHADESHRI SANJAY S. MANDE (Alternate)

SICGIL India Ltd, Chennai SHRIRUQSHADDADABHOYSHRI R. PADMANABAN (Alternate)

Strategic Engineering (P) Ltd, Chennai DRM. RAMAKRISHNASHRI G. S. VISWANATH (Alternate)

Techno Valves, Kolkata SHRI Y. K. BEHANISHRI R. BEHANI (Alternate)

IS 8451 : 2009

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Organization Representative(s)

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmoniousdevelopment of the activities of standardization, marking and quality certification of goods and attending toconnected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any formwithoutthe prior permission in writing of BIS. This does not preclude the free use, in course of implementing the standard,of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright beaddressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issue ofëBIS Catalogueí and ëStandards: MonthlyAdditionsí.

This Indian Standard has been developed fromDoc No.: MED 16 (0947).

Amendments Issued Since Publication______________________________________________________________________________________

Amendment No. Date of Issue TextAffected______________________________________________________________________________________

______________________________________________________________________________________

______________________________________________________________________________________

______________________________________________________________________________________

______________________________________________________________________________________

BUREAUOFINDIANSTANDARDSHeadquarters:

Manak Bhavan, 9 Bahadur Shah ZafarMarg, NewDelhi 110002Telephones: 23230131, 23233375, 23239402 Website: www.bis.org.in

Regional Offices: Telephones

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K.G. Computers, Ashok Vihar, Delhi

AMENDMENT NO. 1 MAY 2013 TO

IS 8451 : 2009 PERIODIC INSPECTION AND TESTING OF HIGH PRESSURE GAS CYLINDERS — CODE OF

PRACTICE

(Page 9, Informal table) — Insert the following after coal gas (town gas, lighting gas):

Name of Gas Chemical Symbol of Gas

Periodical Inspection Interval (in Years)

Compressed Natural gas (CNG)

– 3

(Page 10, Informal table, Note 2) — Insert the following new note:

‘3 Cylinders for compressed natural gas shall be subjected to both pressure test and ultrasonic examination as per 11. The ultrasonic examination shall be done after the hydraulic proof pressure test.’ (MED 16)

Reprography Unit, BIS, New Delhi, India