58673857 Method of Statement Natural Gas Pipeline Installation

7/28/2019 58673857 Method of Statement Natural Gas Pipeline Installation

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Method Of Statement

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METHOD OF STATEMENT

Project:

Client:

INTRODUCTION

This method of statement caters for

OBJECTIVE

This method of statement shall be used as a guideline to assist xxxxx. (hereinafterreferred as xxxx)

personnel to fully understand theirresponsibility on how to execute their work in a safely and efficient

manner throughout the project.

WORK SCOPE

This procedure is applicable to all Natural Gas pipeline installation at xxx and aims to:

To ensure that all works carried out comply in all respect with the Act and Regulations and by laws of the

followings:

1. XXXStandardCode ofPractice for the Installation of Fuel Gas Piping Systems and Appliances

2. Occupational Safety and Health Act and Regulation 1994* Not limited to the above act and regulations, the duty to comply extended to any other authority having

jurisdiction over the scope of works.

WORK ACTIVITIES

1. Storage management2. HDD work3. Soil excavation work4. Soil backfill work5. MDPE pipe and fittings installation6. Carbon steel pipe and fittings installation7. Anti-corrosion tape wrapping work8. Coring work9. Sleeve insertion works10.Gas cock installation11.Leakage testing12.Housekeeping

WORK PREPARATION

Pre-job meeting


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Pre-job meeting shall be held prior to the commencement of any work activities at site in order to ensure

all parties involved are well informed of the work process and the associated safety hazards. Toolbox talk

and JSA shall be held with the workers prior to commencing work.

Manpower

xxx shall be represented by:-Engineering Manager He is responsible of all activities related to the project. He is available on request or

as per job requirement.

Project Manager He is responsible of the execution of the project. He is available full time at site.

Project Executive He assists Project Manager in the execution of the project. He is available on request or

as per job requirement.

Site Supervisor He is responsible of the manpower planning onsite. He is responsible to obtain all permits

required prior to the job, holds toolbox talk and JSA with workers and ensures work complies with the

design. He is also responsible for chairing daily progress meeting onsite. He shall act as the immediate

authorized person in the absence of the Project Manager.

Welder He is responsible of MDPE pipes and fittings fusion, carbon steel sch40 pipe and fittings welding

and conducts leakage testing.

Fitter He is responsible for general works at site.

Management : 3 person

General Workers : 7 person

Total no. of workers at site : 8 person

Machinery, Tool & Equipment

xxx shall provide good working equipments in order to complete the work safely. xxx shall supply but not

limited to the following equipments:-

1. Electro-Fusion Welding Machine2. Pipe Clamp3. Diesel Generator4. Welding Set5. Thread Machine6. Drilling Machine7. Speed Cutter8. Rotary Hammer9. Grinder10.Hacker11.Coring Machine

PPE & Safety Equipment

xxxshall supply sufficient and comply with the mandatory requirements of standard PPE i.e.

1. Safety helmet2. Safety shoes3. Safety glasses4. First aid box

JOB EXECUTION

Storage management


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xxx shall erect site storage facilities to store all work materials, tools and equipments. The store shall act as

xxx site office.

Horizontal Directional Drilling (HDD) work

To carry out Horizontal Directional Drilling (HDD) work for underground MDPE pipe installation across the

main road.1. Prior to carrying out HDD works, xxx shall discuss and verify with the main contractor and

consultant the area/path to be drilled. Drilling path designed with consideration to the position of

existing utilities, accessibility of drilling rig and geographical site, and shall be at least 3 feet below

the road. Details of utilities shall be marked on plan, should necessary final adjustment will be

made at site.

2. Radio detection shall be used to finalize the path. Trial hole shall be excavated to verify the base ofthe underground utilities. Warning signs and colored bunting shall be erected at locations of

overhead power cables. Work area shall be barricaded with warning signs erected.

3. Horizontal distance and cross sectional profile of the proposed bore shall be determined withmeasuring tape and dumpy level. Drilling path shall be marked on the ground.

4. High viscosity drilling fluid shall be used to prevent the collapse of borehole during drilling. Drillingfluid viscosity shall be monitored and maintained at Funnel Viscosity 40 secs/quart.

5. A (1.5 m x 1.0 m) x 1.0 m depth pit shall be dug at the entry and exit point to cater for cuttings andfluids.

6. Commence drilling operations by attaching a 3 diamete r fluid jet drill head with sensor to the drill

rod. Drilling trajectory shall be monitored at every 3m by DigitrakElectronic tracking system.

7. Locator technician shall inform drilling operator should drill head strays off course. Adjustmentshall be made by the drilling operator.

8. At exit pit, drill head shall be removed and replaced with a fluid jet reamer.9. Reamer shall be retracted through the drilled hole at doing so borehole will be enlarged and

more cuttings will be removed. Different diameterreamers shall be used to enlarge borehole in

steps to a max of approx. 30 percent than pipe size.

10.MDPE pipe will be laid on rollers after being string up.11.After final reaming, pipe will be attached to the last reamer and swivel and will be pulled intoborehole.12.Upon installation pipe ends shall be capped to prevent foreign particles ingress. Site shall be

cleaned and reinstated and drilling rig demobilized.

Soil excavation work

To conduct soil excavation work to lay underground MDPE pipe and underground carbon steel pipe (c/w

anti-corrosion tape).

1. Prior to carrying out excavation works, LWG shall discuss and verify with the main contractor andconsultant the area/path to excavate.

2. Permit shall be applied and made available at site. Toolbox talk shall be held prior to starting work.3. JCB excavator shall be mobilized, unauthorized personnel kept out of the excavation area.4. Trench shall be excavated as per approved drawing. It shall be prepared as such that the pipe layson a firm, continuous bearing on the bottom.5. Excavator demobilized and site cleaned in preparation for pipe laying.


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MDPE pipes and fittings installation

1. Welders shall make sure that all pipes and fittings are dry, free from burrs, suspended matter andoil.

2. Prior to jointing the pipes with electro-fusion machine, the MDPE pipe shall be aligned properly byclamp.

3. For more detailed information on electro-fusion joint of MDPE pipes and fittings, refer toattachment B.Carbon steel pipes and fittings installation

Pipe Cutting

Pipes shall be cut to desired length based on shop drawing:-

1. Pipe length shall be measured by measuring tape and marked at the desired length based onendorsed shop drawing.

2. Speed cutter (on Portable Cut-Off Saw) shall be set on clean, dry, stable surface, without thepresence of flammable elements and connected to the power supply.

3. Wear proper apparel. Do not wear loose clothings, gloves, necklaces, rings, bracelets or otherjewelleries which may get caught in moving parts. Nonslip footwear is recommended. Wear

protective hair covering to contain long hair.4. Safety glasses shall be used. Face or dust mask shall also be used.5. Pipe shall be laid on the speed cutter, pipe marked position adjusted to the speed cutter cutting

wheel.

6. Pipe position shall be fixed at 90deg with the base of speed cutter and hold down by clamps.7. Before using the tool on pipe, let it run for a while. Watch for vibration or wobbling that could

indicate poor installation or a poorly balanced wheel.

8. Switch on, wait until wheel attains full speed and lower gently cut the pipe on marked position.9. Watch out for flying sparks when operating. They can cause injury or ignite combustible materials.10.Do not overreach. Keep proper footing and balance at all times.11.Do not touch the workplace immediately after operation; it is extremely hot.12.Never leave tool running unattended. Turn power off. Do not leave tool until it has come to a

complete stop.13.Power off and disconnect power supply.

Anti-corrosion Tape Wrapping

All underground, floor/wall embedded carbon steel pipes should be wrapping with anti-corrosion tape to

keep the pipes corrosion free.

1. The pipe surface shall be free of mud, oil, grease or any others foreign material that will preventthe joint coating system from bonding to the steel pipe surface.

2. Visible oil and grease shall be removed with suitable solvent.3. The steel surface shall be dry prior to the application of the joint wrap tapes.4. KEROSENE shall NOT be used for cleaning the pipe joints.5. Wrapping shall be applied under hand tension or using a hand-wrapping machine capable of

maintaining even, constant tension across the width of the tape.6. The wrapping shall be 55% over lap.

Screw Thread Making

To fabricate male screw end on pipe, pipe shall be threaded by threading machine:-

1. The threading machine shall be set on clean, dry, stable surface, without the presence offlammable elements and connected to power supply.


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2. Wear proper apparel. Do not wear loose clothings, gloves, necklaces, rings, bracelets or otherjewelleries which may get caught in moving parts. Nonslip footwear is recommended. Wear

protective hair covering to contain long hair.

3. Be sure switch is OFF before plugging in. Carrying tools with your finger on the switch or plugging intools that have the switch ON invites accidents.

4. Do not overreach. Keep proper footing and balance at all times. Proper footing and balance enablesbetter control of the tool in unexpected situation.5. Insert the pipe into the Threading Machine so that the cutting mark is located about 12inches to

the front of the speed chuck jaws.

6. Insert workpieces less than 2 feet long from the front of the machine. Insert longer pipes througheither end so that the longer section extends out beyond the rear of the Threading Machine.

7. To avoid equipment tip-over, position the pipe supports under workpiece.8. Tighten the rear centering devise around the pipe by using a counter clockwise rotation of the

handwheel at the rear of the Threading Machine. This prevents movement of the pipe that can

result in poor thread quality.

9. Secure the pipe by using repeated and forceful counterclockwise spins of the speed chuckhandwheel at the front of the Threading Machine. This action hamme rs

the jaws tightly a round

the pipe.

SMAW Welding

Shielded Metal Arc Welding (SMAW) or stick welding is a process which melts and joins metals by heating

them with an arc between a coated metal electrode and the carbon steel pipe:-

1. Wear welding mask /welding goggle and welding glove.2. Arrange cables to one side and away from the operator.3. Do not coil or drape cables around body.4. Keep welding power source and cables as far way from operator as practical.5. Connect work clamp to pipe as close to the weld as possible.6. Bevel the pipe end into 30 Degree by using grinding tools. And also remove oxidation and mill scale.7. Align the pipe/fitting in jointing position with 1.5mm gap between 2 elements.8. Set-up the welding machine with proper amp and select an electrode.9. Electrode angle should be 75r - 80r according to welding position.10.The electrode outer coating, i.e. flux, assists in creating the arc and provides the shielding gas and

slag covering to protect the weld from contamination.

11.The electrode core provides most of the weld filler metal.12.Weld the joint by moving electrode along the pipe end bevel at the correct speed, the metal

deposits in a uniform layer will seal the joint (bead).

Leakage testing

Pneumatic leakage testing shall be conducted by welder prior soil backfilling for MDPE pipe and cement

patching for embedded carbon steel pipe.

1. Testing pressure is determined by 1.5x of operating pressure or minimum 5 psig.2. Testing shall be witnessed by main contractor / consultant.3. Testing record must be documented and endorsed by main contractor / consultant.


6/7

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Nail bracke

sall beapplie

to alle

be

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carbon

steelpipes for teporarypositioning beforece

ent

plastering:-

a) Fabricate pipess all bealigne into pipegroove

!

b) 2pieces of nail (approx 3 " " x 25 " "

length)shall be drived into the wall/slab and

nail head sec#

red with slim wire to hold pipe

in centre!

c) Care to be taken not to scratch/damagepipe !

Co $ in%

wo $ & s

To core floor slab / beam bycoring machine to allow pipeline to beinstalled through.

1. Prior to carrying out coring works' LWG shall discussand verifycoringposition and obtain permitfrommain contractor and consultant.

2. Markcoreposition and fit/mount thecoring machinein position by using wallplug.3. LWG shalle ( uip thecoring machine with proper size ofcore bit and providecurrent supply.4. Switch on thecoring machineand spray water on thecore hole during process.5. Turn offcoring machineafter bit coreis through theslab/beam.6. Dismantle the wallplug and clean thecoring site.

Sl) )

v)

ins)

0tion wo 0 1 s

1. Toolsand e2 uipments to bepreparee.g. measuring tape 3 PVCpipeetc.2. Thelevel ofPVC to beinserted at the wallslabshall bemeasured and marked.3.

PVCpipeshall becut using pipecutter and pipes buttsealed with masking tape.4. Thecompleted PVCpipeshall beinserted into the floor beammold.

5. Tighten thePVCpipe with the wireat themesh wire.Soilbac 4 fill wo 5 4

To conduct soil backfilling workafter theinstallation of underground MDPEpipeand underground carbon

steelpipe.

1. Upon installation, the underground piping shall becovered with sand bedding.2. Tracer wire, warning slab, protection slab shall belaid to mark theposition/asprotection to the

installed piping system.

3. On top of theprotectiveconcreteslabs, the trench shall be filled and compacted with soil.Drawingsasper Attachment A.

4. GI. Bpipesleeveis re 6 uired asaprotectivesleeve for road-crossing pipes.Gascoc 7 installationGascockshall beinstalled at each gas outlet after thepipelinesysteminstallation iscomplete.


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Prepared By :

xxxx

Reviewed By : Checked By :

Approved Approved

Rejected Rejected

Signature :

_________________________

Name :

Date :

Signature :

_________________________

Name :

Date :

Signature :

_________________________

Name :

Date :

58673857 Method of Statement Natural Gas Pipeline Installation

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Transcript of 58673857 Method of Statement Natural Gas Pipeline Installation