MST-PL-01 Drainage Piping Above & Underground.docx

ABU DHABI FUTURE SCHOOL PROGRAM – Phase (2)PACKAGE – 4

KG SCHOOLS AT Al BAHYA & AL FALAH

Method Statement for Installation of Drainage Pipes

ClientAbu Dhabi Education Council

EmployerMusanada

ConsultantDewan

ContractorUnited Engineering Construction

MEP SubcontractorAl Sabbah Electromechanical

Issued on 31 March, 2013

Prepared By: Reviewed by Approved by MSRev. Name Date Name Date Name Date No.

0ASEM-MST-PL-01

Method Statement for Installation of Drainage Pipes (Underground & Above ground)

TABLE OF CONTENTS

1. Purpose2. Scope3. Legislation and Code of Practice4. Reference5. Definitions6. Resources6.1. Equipment6.2. Safety of Equipment’s7. Safety Precautions7.1. Construction Hazards7.2. Personal Protective Equipment7.3. Safety Training and Emergency procedures7.4. First Aid8.Detailed Construction Sequence (Methodology)8.1. Procedure9.Construction Program9.1 Housekeeping 9.2 Protection of Executed Works 9.3 Responsibilities 9.4 Records10.Inspection and Testing11.Related Forms12.Attachments

ASEM-MST-PL-01 Rev.0 Page 2 of 9


1. Purpose

This document describes the methodology of Installation of drainage pipes (underground and above ground) for Abu Dhabi Future School Program – Phse 2, Package 4 Project, and to ensure that all concerned persons are familiar with the sequence of activities, utilization of resources, and execution of the works in compliance with applicable Safety and Quality Procedures, and Project Documents and Specification.

2. Scope of WorksThis method statement is intended to outline the activities and the methods used for the Installation of drainage pipes (underground and above ground). All activities will be carried out in accordance with the contract details and in full compliance to the Contract Specifications and documents. All work within the rights-of-way of the standards and specifications will be done in compliance with requirements issued by authorities.

3. Legislation and Code of Practice

All related codes and standards referenced in the project plumbing specifications volume 3 part E division 22 section 22 15 00.

4. Reference Contract Specifications Approved Drawings

5. DefinitionsClient : Abu Dhabi Education CouncilConsultants : DewanContractor : United Engineering Construction

6. Resources

6.1. Equipment / Tools

DESCRIPTION Tool Box

Measuring Tape

Hack Saw

Spirit Level

Excavator

Roller/Plate Compactor

Solvent Cement

6.2 Safety of Equipment’sNecessary measures will be taken for the safety of the equipment and any other works affected by the works subject of this document. Relevant entities which might require protection include any such works in the vicinity of the area of work or on the service access or discharge path.

The construction team will ensure that any such requirements are documented.



7. Health, Safety & the Environment

7.1 Construction Hazards (tick as appropriate)

Corrosive OxidizingHighly

flammableExtremely flammable

Toxic Highly Toxic Irritating Harmful

Explosive Danger for the Environment

Constrained Space

Slippery Surface

Danger of Electrocution

Falling from Height

Other

____________________

____________________

____________________

____________________

The hazards identified above will be controlled under the overall Project Safety Plan which is a separate document communicated to all parties on the project.

7.2. Personal Protective Equipment (tick as appropriate)

The works subject of this document requires that the following PPE be used:

Safety Precaution

Helmet Hi-VizEye

ProtectionFace

ProtectionMask

RequiredRespirator Required

Ear Protection

Gloves

RequiredSafety Shoes

RequiredProtective Clothing

Safety Harness

Equipment Guards

Lifejacket Other

____________________

____________________

____________________

____________________

7.3. Safety Training and Emergency proceduresBefore commencing any works, all employees will attend a site safety induction training to ensure all safety measures are understood and implemented and to cover specific procedures in case of emergency. If necessary, practical training exercises will be conducted on escape routes, signage, evacuation and rescue.

7.4. First AidPrior to the commencement of work, arrangements will be made for medical facilities and medical personnel to be available from prompt attention to the injured person. The contractor’s vehicle assigned to the job site will be used for transporting the injured person to the first aid station and to the nearest hospital when required.



Name of On-Site First Aider/s:

First Aid Box Location:

Location of Nearest Hospital:

First Aid and Medical Supplies available at site:

Potable Water Ice Cubes

10x6cm Sterile Gauze Pad 4x6cm Gauze Roller Bandage

10x10cm Sterile Gauze Pad 8x10cm Gauze Roller Bandage

Large Sterile Gauze Pad 10x12cm Gauze Roller Bandage

Burn Dressings 5cm Elastic Bandage

7.5cm Elastic Bandage 10cm Elastic Bandage

Triangular Bandage Barrier Device for CPR

Adhesive Skin Tape Adhesive Leucoplast Tape

Emergency Blanket Safety Pins

First Aid Scissors Tweezers

Disposable Gloves Instant Cold PackNon-prescription Medicines (Aspirin, Ibuprofen, Acetaminophen) First Aid and Burn Spray, Deep Heat Spray

8. Detailed Construction Sequence (Methodology)

8.1. Procedure

8.1.1 Handling for pipes:During transportation pipes must be handled with care. Do not drop or drag pipes especially on hard

surfaces. This is particularly important where the pipe ends have been already prepared in the form of

spigots (e.g. chamfered ends) and integral sockets, wherever possible the loading and unloading of

pipes to be carried out manually by hand. When mechanical lifting equipment is to be used, no metallic

slings, hooks or chains should be used in direct contact with the pipe. Ropes or web slings are preferred,

as they will not damage the pipe wall.

8.1.2 Storage on site Pipes should be stored on a flat dry level surface free from sharp projections, stones or other objects

likely to cause point loading or pipe deformation. Timber supports spaced 1.5m apart along the pipe can

be used to support the pipes. The width of the stack should not exceed 3m.

Pipes of different sizes should be stacked separately or where this is not possible, hose with larger

diameters and/or thicker walls should be placed at the bottom of the stack. The height of the stack

should never exceed 7 layers or maximum 2m high. If prolonged storage is needed (more than one

month) or where the temperature exceeds 23oC then the stack should not exceed 4 layers or maximum

1m high.



All pipes and fittings should be properly covered with tarpaulins to protect them from UV rays. The

tarpaulins are to be fixed to the wooden supports, which allow a free passage of air around the pipes.

Fittings will be stored in sheltered conditions in the boxes as supplied to protect them from weathering

and accidental damage.

8.1.3 Above Ground Installation:

a. Ensure that the mating areas of spigot and socket are thoroughly clean and square.

b. Install pipes with the appropriate hangers and clamps at every 1 meter of possible distance.

c. Set the pipes joints properly and use solvent cement for jointing.

d. Accurate axial alignment of the spigot prior to joining is important.

e. Complete the joint by applying leverage to the following socket and using a timber block to prevent damage.

8.1.4 under Ground Installation

8.1.4.1 Trench FormationThe trench shall be excavated by a Hand/Back hoe Loader, after the area of excavation is identified, The

formation of the trench must consist of stable, uniform and smooth soil devoid of irregularities for direct laying

of pipes, Compaction for the full width of the pipe trench shall be to at least 95% Modified Proctor Density plus

300mm from each side and no wider than the pipe dia plus 600mm from each side, while the depth of the trench

shall be 150mm below the pipe invert level where a layer of 20 Mpa. Concrete is laid with on average depth of 75

mm to maintain the 150mm below invert level of the pipe (wherever applicable).

The excavated material shall be placed on one side of the trench leaving the other side clear for pipe handling,

and the bed of the trench should be smoothened out evenly to provide a uniform support for the pipe. While

excavating 2 number of labors should be present with the excavating machine to avoid any damages that can

occur while excavating to any of the underground services.

8.1.4.2 Sequence of Installationa. Mark routing of pipe work according to approved shop drawing.

b. Install piping as per approved shop drawing.

c. All horizontal drainage piping shall be installed with 2% slope unless otherwise indicated.

d. Install fittings for changes in direction and branch connections with appropriate branches, bends

and long sweep bends.

e. Sanitary tees and short sweep ¼ bends may be used if change in direction of flow is from horizontal

to vertical.

f. Use long turn double Y-branch and 1/8 bend fittings if two fixtures are installed back to back or side

by side with common drain pipe.

g. Do not change the direction of flow more than 90 degrees.

h. Use the proper size of standard increasers and reducers if pipes of different sizes are connected.

i. Reducing the size of drainage piping in direction of flow is prohibited.



j. Install encasement on underground piping according to ASTM A 674, AWWA C105/ A 21.5.

k. Connect Soil and waste piping to exterior sanitary sewerage piping. Use transition fittings to join

dissimilar piping material.

8.1.4.3 Installation of Pipes in Raft Slab

a. After getting the all civil clearances (including foundation layout, levels, blinding, water proofing & steel

fixing), prepare the pipe length required as the approved shop drawing for the laying through the steel

fixture.

b. Make sure the pipe slope levels are as per the approved shop drawing otherwise as indicated.

c. Pipe to be tied properly as maintaining slope according to approval.

d. Follow necessary steps of installation sequences with leak testing as explained in technical specification

and as per below procedure.

e. Prior to the concrete filling make sure all the installation has been tested for leakage and approved.

8.1.4.4 Pipe Installation & Jointing Works

a.Measure length of pipe required, making due allowance for any pipe fittings to be used and cut the pipe to

the measured length making sure that the ends are cut square and all burs are cleaned.

b.The spigot and socket to be jointed should be carefully examined for any damage which could impair the

jointing procedure.

c.The spigot insertion depth should be measured as the depth from the mouth to the shoulder of the socket.

d.The insertion depth should be marked on the spigot using marker.

e.The jointing system for drainage piping system is “Solvent weld”.

f.The mating areas of the spigot and the socket should be thoroughly cleaned using the pipe cleaner and a

clean rag.

g.Using a brush apply an even layer solvent cement to the spigot and socket mating surfaces. The cement

should be applied in a lengthwise direction and not with a circular motion. The cement should be

applied simultaneously to the spigot and socket by two people.

h.Immediately following cement application ensure that the pipe is suitably anchored, and push the spigot

home in the socket without turning the pipe. The spigot should be inserted with a steady, continuous

motion and held in place for 20 seconds. Remove the surface cement from around the mouth of the

socket.

i.Leave the joint undisturbed for five minutes and then handle with reasonable care.

j.Plug all open ends of the pipe work after finishing the work.

8.1.5 Leak Testing

a. The piping system to be tested shall be closed by plugging and blanking all openings in the system in an

approved manner.

b. Suitable plugs are inserted at the lower end of the drain or sewer and at the head of any connections.



c. A suitable bend together with a vertical length of pipe is fitted at the head of the sewer or drain to provide the

necessary test head. The system then filled with water.

d. Close openings in piping system and fill with water to point of overflow. The sewer or drain under test should

be left filled with water for at least 2 hours during which no level drop should be observed to ensure that all

piping and joints are not leaked.

e. During the water test, precautions should be taken to prevent any movement of the drain or sewer.

f. All ends shall be kept plugged after completion of test to protect from debris.

g. After successful testing & Inspection of pipe work, covering of pipe work can proceed as per approved drawing

details.

5.6 Backfilling

I. Embedded in concrete

a. Place the pipe in the containment with pipe support members

b. Maintain the slope properly (2%) or as shown on drawing

II. Buried in soila. Backfilling shall take place immediately after the entire test has been approved by the

client/consultant b. Provide warning tapes or detectable warning tapes before final back filling.

The excavated material shall be used as backfilling material and backfilling material shall be uniformly wetted with water. The backfilling shall be done in layers that do not exceed 300mm of well compacted layer which the compaction will be done by a plate compactor for the said layer, each layer of backfilling shall proceed after the approval for the compacted layer is given for the previous layer

9. Construction Program

As per main program

9.1 HousekeepingThe work area shall be maintained neat and tidy as reasonably practical at all times.

9.2 Protection of Executed WorksExecuted works in areas were other works are still being carried out shall be protected as per the contract requirements.

9.3 Responsibilities

PositionOverall Resp. Supervise Perform Short Description

Project Manager Construction Manager Project Engineer Site Manager Site Engineer Land Surveyor



Safety Engineer QA/QC Engineer MEP Coordinator General Foreman Foreman Charge hand Labourer Helper

9.4 RecordsIn accordance with the Quality Management System, the following records will be maintained as documentary evidence of the establishment of this method statement:

Records to be retained Responsibility Minimum Retention Period

Disposition

Work Notification( If required)

Site Manager As per ContractRequirements

Request for Inspection( RIW )

QA/QC Engineer As per ContractRequirements

10. Inspection and Testing

In Process works shall be monitored for quality of workmanship and installation against approved shop drawings by the relevant supervisor.

All works shall be inspected for conformance to specification. The inspection formats shall be used in accordance with the requirements of the main contractor UNEC. An inspection request for the drainage piping shall be submitted one day prior to the consultant.

11. Related Forms

As per required forms, from main contractor

12. Attachments

Risk Assessment


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