Download Method Statement for Underground Piping Fc PDF

TitleMethod Statement for Underground Piping Fc
File Size299.7 KB
Total Pages17
Document Text Contents
Page 2

1 / 16
















Page 8

7 / 16

of pipe being installed.

(3) On long pipe lengths, sand bags will be spaced on five meter centers.

(4) To avoid damage to coating and following accepted construction practices.

(5) Pipe will be installed in the trenches using wide sling belts and / or hands.

(6) Tolerance of pipe laying shall be as follows :

The level of the pipe at any point along its length is to within ±15mm of the level stated on the


The center line of the pipe at any point along its length is to be within ±50mm of the location stated

on the drawings.

(7) Pipe lowering into trench, pipe shall be inspected internally for dust / debris which, shall be cleaned

(air blowing, brushing etc…)

7.7 Welding

(1) Welding preparation, fit up, inspection and testing shall be carried out in accordance with

Specification for Piping Fabrication by Each Service Class (6423MS231-00-00100 00).

All surfaces to be welded shall be free from oxides, scale, oil or other foreign matter.

Production joints shall be made using qualified welding procedures and welders.

Visual inspection shall be done by welding inspector during and after welding.

(2) The daily welding report shall be generated by construction team in accordance with Welding

Control Procedure (6423DA060-00-00900 00).

7.8 NDE

Required NDE shall be requested and carried out in accordance with method statement for NDE control.

All NDE requests shall be transmitted to subcontractor by QA/QC manager.

Contractor will transmit hard copies of NDE information to the owner.

Matrix operator will input NDE date to the data base.

7.9 Repair of welding

Welding repair shall be carried out in accordance with method statement for Welding Control Procedure

(6423DA060-00-00900 00).

7.10 Rubber lining

(1) Inspection for steel substrate

Size, appearance, welded parts and so on shall be checked and confirmed whether there are no

defects, which may influence on lining work.

If there are such defects, repair shall be performed.

(2) Surface preparation

Surface preparation shall be carried out by grinder on welding area, so that rust and scale on a steel

surface are completely removed.

In this process, welding areas shall be rechecked and if any defects, such as pinholes are found,

repair shall be performed.

(3) Bonding treatment

After grinded, first primer shall be immediately applied.

After dried, rubber cement shall be applied and dried sufficiently.

(4) Application of rubber sheet

Pre-cure rubber sheet (vulcanized rubber sheet : B-5S) shall be applied to steel substrate, so that

no air bubbles are locked between rubber sheet and the surface of steel substrate.

Page 9

8 / 16


Please refer to “Rubber Lining Procedure” below.

Rubber Lining Procedure (Pipe Joint Welding Area) : Example

(5) Inspection

After lining application, following inspection shall be performed for whole rubber lined area.

(a) Thickness inspection

(b) Pinhole inspection

(c) Hardness inspection

(d) Appearance inspection

7.11 Backfilling

(1) Backfilling work shall be carried out in accordance with Procedure for Earth Work

(6423DC420-00-00700 00).

(2) Pipe padding should go after pipe bedding by filling with suitable materials 300mm thick from top of


(3) Subsequently after completing the pipe padding backfilling of suitable excavated earth material

shall be placed 300mm in layers and compacted in accordance with project specification


7.12 Hydro test line (Fire water system)

(1) Epoxy coating shall be done at site.

(2) Pipe surface shall be prepared by mechanical power tool cleaning.

(3) Fit up and welding shall be carried out as per WPS.

(4) Hydro test shall be carried out after completion of all NDE(if required) and spool clearance


(5) After completion of hydro test and its acceptance by owner, the epoxy coating of welded joints shall

be done.

(6) If any repair, modification occurs in the site during installation to the fabricated spool then the same

spool shall be recoated and re-hydro tested in the site with the above same procedures.

(7) The epoxy coating application shall be done in accordance with manufacturer’s instructions.

Coating inspection shall be made and recorded on attachment #1.

7.13 Service test line (Seawater, CCW and Etc)

(1) Before fit up and welding coating shall be removed from pipe in the range of 10cm over and the cut

back area surface should be cleaned properly.

(2) Pipe surface shall be prepared by mechanical power tool cleaning.

(3) Fit up and welding shall be carried out as per approved WPS.

(4) After completion of all NDE activities(if required), spool clearance shall be carried out epoxy and

(B-5S 4t)

(C-6 4t)

Page 16

15 / 16


Sequence of Task Potential Hazards Recommendations / Control Measures

Welding and Cutting works
Fire, explosion, damage
to lives and properties

►Wearing of PPE shall be mandatory in all aspects of welding
and cutting works.

►This shall include face shield and welding goggles.
►Hot work permit shall be secured prior to start of any welding

and cutting works.
►Fire extinguishers shall be available near the work site at any

►Proper use of fire extinguishers shall be disseminated to all

personnel involve in the job.
►All welding, grinding and cutting equipment shall be inspected

prior to start.
►This shall also include inspection of electrical sources and

►Damage cables shall be immediately replaced.
►Only properly trained personnel shall be permitted to do

welding and cutting works.
►Work area shall be properly barricaded.
▶STAART required prior to start of task.
►Always check areas around and below prior to commencing

welding or cutting operations.
►Ali combustible materials under or near welding or burning

operations must be moved to a safe distance away or
covered with a fire retardant material.

►Welding leads and gas hoses shall not be placed where they
will present tripping hazards.

►Proper spark containment method such as fire blanket shall
be used when doing welding and cutting.

►The welding machine shall be properly grounded and as close
to the work as possible.

►Never leave a welding rod in the electric holder when not in

►Never use a torch as hammer to remove slag or scale. Use
the proper tool.

►Never use lighters, matches or cigarettes to light a torch. Use
only approved spark lighter.

►Welding machine shall be turned off at the end of the shift.
►Fire Blanket shall be used for welding habitat.
►All galvanized pipe shall be cleaned in areas to be welded

prior to welding.

Grinding work

Injuries by grinding

Fire burn and eye

►Only skilled worker can carry out the job.
►Avoid water contact and keep grinding machine always dry.
►Continuous training and remained hazard of grinding
►Damage of electric wire to be checked continuously.
►Grinding machine and grinding wheel should be checked

before use
►Wear adequate PPE

NDE Exposure to X-ray

►Working area should protected by installing warning tape and
x-ray hazard symbol.

►Only skilled worker can carry out the job
►Wear radioactive absorption batch when working to

neutralized radioactive emission.

Housekeeping and area

Slip, Trip, Fall

►Proper housekeeping to be maintained at all times
►Material should never obstruct walkways / staircase / ladders

and access to emergency equipments.
►Area to be cleaned and barricades and warning tapes to be


Page 17

16 / 16

Sequence of Task Potential Hazards Recommendations / Control Measures

Handling of pressurize tanks
(Oxygen, Acetylene, Argon)

Fire explosion damage
lives and properties

►Hose and fittings of gas cylinders shall be checked for leak by
soapy water.

►Oxygen and fuel gas cylinders in storage shall be separated
by a minimum of 6 meters.

►Gas cylinders shall be handled carefully. Avoid bumping or
dropping them.

►Always secure in an upright position and properly supported.
►Valve protection caps shall be on cylinders when not in use

and when being transported.
►Be sure protective caps are adequately screwed down.
►Use a holding cage when lifting cylinders with a crane.
►Choking around cylinder shall not be allowed.
►Smoking is not allowed on the project site except in properly

designated areas.
►Discard butts approved containers, not on the floor/ground or

in trash cans.


All risks to be happened
during working

Expected risks during
night shift

►Every day before start of work tool box meeting to be between
supervisor and worker.

►Supervisor should give information regarding hazards
indulged to daily work activities.

►Always keep clean working area.
►Close supervision shall be done during late night hours.
►Supervisor should give information regarding hazards

indulged to daily night work activities.
►Adequate drinking water facilities should be provided.
►Every night before start of work tool box meeting to be

between supervisor and worker

1. JSA should be used in conducting Tool Box Talks(TBT) with all concerned workers
2. Provide that all the necessary PPE are used, relevant PTW requirements are followed and all the control

measures stated above are adhered to, the activity can proceed.

PPE & Safety Equipment Required to Perform Task (Tick as Appropriate)

Safety Helmet Face Shield Goggle Barricade Harness Hand Gloves Safety Shoes

Ear Plug Coverall Safety Glasses Work Permit Fire Extinguisher Dust Mask Others

Similer Documents