GEN-046 MOS-DR-01_Sewer Water Pipe (Clay Pipe) Belowground Installation

SIDRA VILLAGE STAFF HOUSING FOR SIDRA MEDICAL AND RESEARCH CENTER

Document No. MOS-DR-01

Revision 00 Page: 1 of 15

SEWER WATER PIPE (CLAY PIPE) BELOWGROUND INSTALLATION

00 23.08.2012

Rev Date Status Developed By Reviewed By Approved By




TABLE OF CONTENTS

Section No

Description Page No.

1.0 Introduction Page 3

2.0 References Page 3

3.0 Planning Stage Page 4

4.0 Construction Stage Page 4-13

5.0 Completion Stage Page 13-14

6.0 Responsibility Page 15




1.0 Introduction

This Method Statement defines the method of installing the Sewer Water Pipe, Fittings and accessories.

This method statement covers the works associated with the installation of

Sewer Water Pipe for the Internal Sewer Network and to connect to Future

External Ashghal Trunk Sewer Network, between Manholes to Manholes,

House Connection Pipe from Ground Discharge of various Building.

2.0 Reference

Reference is made to the Design and Detail Drawings, Mechanical Specifications, and the Employers Requirements. Reference is made to the design and constructs contract, Mechanical Specifications, and the Employers Requirements. The standards indicated therein will be followed (where applicable) for the execution of the works.

2.1 Relevant documentation

A. Latest Mechanical Specifications, Drainage Installation Section 20.1.06 Drainage System.

B. Latest Edition and Publication of QCS, Sewerage Division and

Ministry of Public Works, State of Qatar

C. Code for Saudi Arabian Standard Organization, SASO/GSO/EN295/2008 which is fully complying with EN295 & ASTM C700. .

D. Latest Approved Infrastructure & Coordinated Shop Drawings.




3.0 Planning Stage

3.1 Preparation of Drawings

3.1.1 Check construction drawings and inform the scope of works at areas concerned.

3.1.2 Prepare shop drawings at areas concerned and followed by others

progressively.

3.1.3 Submission of Schedule of Manufacturer’s List on type, brand and Model of materials / equipment to be used for approval from Consultant and Employer.

3.2 Preparation of Materials

3.2.1 Check for any damages and replace any defective materials before delivery to site.

3.2.2 Upon delivery to site, check serial no., model no., damage during

transportation, to make sure same as shipping list / delivery order. Check catalogues for specification compliance.

3.3 Tools and Equipments 3.3.1 All tools for use on the site are to be in an operable condition.

Defective extension wire & plugs are not allowed.

3.3.2 Ensure equipment / machinery used is in proper conditions and securely supported before delivered to site.

a. Pipe shavers b. Band Clamps c. Air Blower d. Grinders & Drill machines e. Various Hand Tools f. Mobile Crane g. Excavator & Loaders




h. Dump Trucks, Trailers and Water Trucks i. Compactors j. Drainage Pipe Water Gravity Testing Plug k. Other necessary tools and instruments.

4.0 Construction Stage

4.1 Unloading & Storage at Site

4.1.1 Pipes are to be checked on unloading.

a) With Crane or Excavator

Use lifting belts; chain or ropes may not be used.

The lifting belts must be placed outside around the pallets and outside the base timber.

Steer the pallets manually to prevent them colliding with anything.

Do not move the pallets on the truck with the aid of levers or crowbars.

Do not allow the pipes to be impacted by any hard object (e.g. crane hook, chain etc.).

b) With Forklift Truck

When placing the pallets transversely on the forks, make sure the forks are positioned sufficiently widely apart




When placing the pallets longitudinally on the forks, place protective timber between the parcel and the fork’s base. Better is to transport the parcel in transversal direction on the fork teeth.

When transporting individual pipes by sliding a tooth into a pipe, always have protective material between the forks and the pipe.

4.1.2 Storage at Site

4.1.2.1 Do not put the pallets down on to hard ground with a bang.

4.1.2.2 Put the pallets down only on ground that is sufficiently hard to




prevent the base timber sinking into it 4.1.2.3 Leave sufficient space between individual pallets.

4.1.2.4 To avoid damage to the sealing elements, store individual

pipes only on a wooden base.

4.1.2.5 Store fittings standing upright on their sockets.

4.2 Pipe Laying & Installation

4.2.1 Before the pipes are laid, check both ends of each pipe, optically in

order to find any cracks that might have occurred in the course of transport.




4.2.2 The paint mark must always point upwards. This ensure: * The pipe inverts will be level (any steps that might arise between two pipes will be within the permissible tolerance)

4.2.3 Install pipe according to required gradient and shall be executed as the following steps:

Step 1: Keep the trench width narrow, especially at the top of the

pipe. A wide trench means more load on the pipeline.

Step 2: Spread bedding material in front of last pipe laid. Smooth it out.




Step 3: Imported bedding should be at least 4 inches thick – thicker for larger pipe. Make

sure the bedding is packed down.

Step 4: Use grade rod, laser or grade machine to check grade of bedding. This means

less pipe handling when the pipe is laid.

Step 5: Dig bell or coupling holes before pipe is laid. Just scoop out bedding with a

shovel.

Step 6: Keep water out of the trench so bedding can be placed and graded accurately.

Pipe joints can be made easier too.




Step 7: Pump out the water or use well points sunk below the depth of the trench

bottom.

Step 8: Follow manufacturer’s instructions for installation of flexible compression joints.

Make sure joints are clean before installing them.

Step 9: If a bar is used to shove the pipe home use a block of wood to cushion the bell.

Make sure the pipe is laid straight and to grade.

Step 10: Tamp a layer of bedding material under the pipe haunches, not under the bell.

This gives the pipe added support and keeps it in line.




Step 11: If too much bedding is thrown on top of the pipe, it won’t get under the pipe

even with tamping. Don’t let this happen!

Step 12: Make sure fittings, stubs and risers are well supported. Tamp soil around and

under haunches of the pipe and fittings.

Step 13: Use short stubs with flexible compression joints at manhole walls. They will

take care of manhole settlement.

Step 14: Hand cover the pipe with about 12 inches of backfill over the top of the pipe.

This protects the pipe during final backfilling.




Step 15: Do not let rocks or lumps get into the trench. They can damage the pipe and

ruin the alignment.

Step 16: Place final backfill into the trench at an angle. This keeps impact on the

installed pipe to a minimum.

Step 17: Heavy compaction equipment should be used with caution. Pipe can be

damaged if impact is not carefully controlled.

4.3 Gravity Test 4.3.1 Gravity sanitary sewer and Industrial drainage system shall be tested

with potable water, well water or sea water.

4.3.2 Gravity test shall be done from manhole to manhole or a column of water equivalent to the rim elevation of the upstream manhole if pipe is to be tested separately.




4.3.3 Gravity test shall be maintained for a period of 4 hours for lines

whose joints have not been backfilled or are above ground piping while 24 hours shall be maintained for lines whose joints have been backfilled.

4.3.4 If manholes are not part of the test or a section of pipe is to be

tested, the pipe ends shall be covered with plumber’s test plugs.

4.3.5 An extension pipe is provided on the test plugs at selected location for water filling and drain points and at least one pipe riser for the water head required that shall be accessible for visual inspection.

4.3.6 Plumber’s test plugs that are not used for other purposes shall be

kept open while filling of water to release air inside the system and shall be closed when the system has been properly vented.

4.3.7 Water filling into the pipe being tested shall be from a water truck or a

ground level water tank with electric or engine-driven pump. A water hose shall be placed direct to the manhole, to the pipe being tested or to a pipe connection provided at the plumber’s test plug.

4.3.8 All joints shall be exposed and cleaned for visual inspection.

4.3.9 Partial sand covering and backfilling on the body of the pipe being

tested shall be done to prevent floatation during test.

4.3.10 Drain valve shall be provided at the lowest portion of the pipe being tested for safe draining after inspection.

4.3.11 Water used for testing can be re-used for another gravity test, for

water flooding of pipe sand covering, for water spray of trenches or discharge to a designated area.

4.3.12 Repair methods for leaking pipes, joints and fittings shall be in

accordance with the requirement and project specification.




5 Completion Stage

5.1 The site inspection is carried out to ensure conformance of the installation work.

5.2 A ‘Request for Inspection’ form is forwarded to the Employer’s

representative as above said.

6 Responsibility

c) Project Manager The Project Manager will have the overall responsibility for the execution and management of the project. The Project Manager will provide the direction to achieve the completion of the project in accordance with the contract terms and conditions.

d) Senior Mechanical Engineer

The Senior Mechanical Engineer is the overall responsibility for the execution of the site work.

e) Project Coordinator

The Project Coordinator is the overall responsible person for process implementation.

f) Site Engineer

The Site Engineer is responsible for all installation activities at job sites.

g) Site Supervisor

The Site Supervisor is responsible to monitor, supervise and coordinate all

the site activities.

h) QA/QC Engineer




The QA/QC Engineer is responsible to responsible for all materials/

installation/ test inspection on site.

i) Safety Officer

The Safety Officer is responsible for implementing the safety programmers, including running weekly toolbox meetings and monthly safety meetings.

GEN-046 MOS-DR-01_Sewer Water Pipe (Clay Pipe) Belowground Installation

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