This method statement outlines the procedures for installing stainless steel cold water piping, including welding schedule 10 pipe and threaded joints of schedule 40 pipe. It describes handling and storing materials, inspecting for quality, planning the work site, and the step-by-step installation processes for both welded and threaded pipe joints. Quality control and safety procedures are also summarized, with an emphasis on inspection checkpoints and ensuring all personnel use proper protective equipment.

1. METHOD STATEMENT – COLD WATER PIPING WORK
pg. 1
1.0 PURPOSE
The purpose of this Method Statement is to establish a uniform procedure for: -
a) Welding joint of stainless-steel pipe and fittings (Sch. 10)
b) Threaded joint of stainless-steel pipe and fittings (Sch. 40)
It aims to ensure that the work force involved to perform the operations have a complete
understanding of the operating standards and safety practices associated with the use
of machinery/equipment /tools.
2.0 SCOPE
The scope of works shall not be limited to piping works only. It shall include supply,
deliver, installation, testing, commissioning and defect liability maintenance for the entire
Cold Water plumbing system.
3.0 HANDLING AND STORAGE OF MATERIALS
Upon delivery at site, all pipes will be hoisted carefully and stored in a dry suitably
designated area. Materials shall preferably be place on timber at both ends, stacked
neatly. Fittings will be stored in a dry store.
4.0 INSPECTION OF MATERIALS
Inspection is then carried out to ensure that materials delivered is new and without
any damage. The materials will not be used for installations unless it has been
inspected and verified for conformance to specifications. Only pipe that conforming to
SPAN standard shall be approved and accepted. Inspection and verification will be
carried out upon Supplier Delivery Order and documented in Material Inspection
Checklist form
This inspection will be carried out by Site Supervisors. The acceptance of material
delivered shall be at the discretion of the consultant representatives with verification by
his immediate superior, resident engineer.
5.0 SITE PLANNING AND PREPARATION
a. All relevant documents shall be approved for execution.
b. All the personnel involved in the job should attend the safety training.
c. Ensure all workers are equipped with PPE (i.e., hard hat with chin strap, goggles,
safety shoes, gloves, safety harness, etc.) relevant to the nature of work to be
carried out.
d. Determine manpower and delegation of task.
e. Fully barricade the work area and restrict entry to authorized personnel only.

2. METHOD STATEMENT – COLD WATER PIPING WORK
pg. 2
f. Deliver to the site the required materials to be installed.
g. All required machineries, tools and equipment shall be placed into the designated
area.
h. Prior to installation of the steel frames and bracket plates, the location should be
cleaned and must be free from any obstructions.
i. Prior to transferring of the Evaporator from yard to outside of building, the road must
be checked and free from obstructions for the truck and mobile crane to have easy
access.
j. Prior to shifting of the evaporator from outside to inside of the building, ensure that
the steel bed frame and railing are properly fixed, aligned and levelled.
k. All qualified and authorized personnel shall be notified when commencing works.
l. For night work, ensure that lightings are adequate.
m. A proper line of communication throughout the job must be detailed.
n. Anticipated problems shall be discussed and resolved immediately.
o. Material catalogue and / or sample to be submitted early for approval prior to actual
construction to avoid delay to physical construction.
p. Daily checklist and measurement sheet for recording purpose and shall be
established to provide information for claim and producing as-built drawing level.
6.0 ACTUAL WORK METHODOLOGY
6.1 WORK METHOD FOR WELDING JOINT – SCHEDULE 10, ASTM A312 TYPE 304
6.1.1 Materials
 Stainless Steel Pipe and Fittings (Schedule 10) - 65mm till 150mm sizes
6.1.2 Tools & Machinery
i) Magnetic drill machine, Drill machine, wrench, hammer, pliers, etc.
ii) Level bar or Level hose
iii) Mobile Crane or Boom Truck
iv) Chain blocks, Slings, shackles, belts, chains, etc.
v) Welding Machine, Electrodes and welding units
vi) Measuring tape, pipe fitter’s wrap-around, marker pen, cleaning rags
vii) Cutting/Grinding machine with carborundum cutting & sanding/grinding
disc
viii)Pie tape, Curve-o-mark, Angle Grinder, Emery disc
ix) Electrical extension wires
x) Level bar or Level hose

3. METHOD STATEMENT – COLD WATER PIPING WORK
pg. 3
6.1.3 Installation Procedure
a) All the welding shall be as per the drawing or standard.
b) Welding must be carried out by qualified and certified welder as per
the below welding preparation and procedures: -
i) Cutting and bevelling
 Mark off the dimension of each pipe and fittings as per the
approved drawing.
 Proceed with cutting of Stainless-steel pipes and fittings,
which shall be done by using cutting disc.
 Once the pipes and fittings are cut, commence with the edge
preparation.
 the edge cleaning and bevelling shall be done using abrasive
grinding disc/bevelling machines.
 Line number, Spool Numbers and Joint Numbers are to be
clearly identified and marked on the spool with the welder
identification for each joint.
ii) Purging arrangement
 Before fit-up, arrange sponge/foam along with argon, gas,
hoses from both sides of the joint.
 Before start of welding open the purging gas in the joint, so
we can get back purging gas during the welding.
iii) Fit-Up and Tack Welding
 Once the surface is bevelled and cleaned proceed for tack
welding
 Welders should put on proper safety equipment prior for
welding.
 Fit-up assembly shall be carried out by using locally prepared
couplers. All the required pipe holdings work benches,
assembling brackets’’ bolts etc. Would be made in house to
suit the pipe size.
 For Butt welds uniform root gap of 1.5-3mm shall be
maintained.
 Before commences the welding ensure that spool is aligned
properly.
 Once required levelness and alignment achieved proceed for
welding.

4. METHOD STATEMENT – COLD WATER PIPING WORK
pg. 4
 The pipe shall be tack welded in three equidistant positions,
Tack welding shall as per approved drawing and standard by
a qualified welder.
iv) Welding
 Ensure that edges are free from dust, rust, oil, grease, paint
etc.
 Welding shall be done as per approved drawing and by
complying with the particular piping standard. Preheating and
welding consumable shall be checked before starting of
welding.
 Each welding layer shall be cleaned before starting to weld
next layer. The cleaned area shall be free from slags. Any
visual defects like cracks, pores, spatters weld shall be
removed by grinding before the next layer is applied. The
ends of weld layer shall be removed by grinding in tack points
of each weld. Any possible welds excess layer will be
removed by grinding.
 For the fabrication & welding of stainless-steel pipes and
fittings only stainless-steel tools and consumables (Wire brush
chipping, Hammer, and Abrasive disc) shall be used.
 Appearance of finished weld shall be as even as possible and
free from spatter, under cutting, cracks, excess reinforcement
etc.
6.2 WORK METHOD FOR THREADED JOINT – SCHEDULE 40, ASTM A312 TYPE
304
6.2.1 Material
Stainless Steel Pipe and Fittings (Schedule 10) - 20mm till 50mm sizes
6.2.2 Tools & Machinery
i) Measuring tape, marker pen, cleaning rags and twine.
ii) Scaffold
iii) Threading machine
iv) Fibre cutter
v) Drill Machine

5. METHOD STATEMENT – COLD WATER PIPING WORK
pg. 5
6.2.3 Installation Procedure
a) Check construction drawings and establish area or works that pipe to be
installed.
b) Determine the pipe route and measure pipe length to be cut.
c) Employing the fibre cutting machine, cut required lengths of stainless-
steel pipe necessary at the work shop.
d) Set the threading machine die to the correct size of pipe to be threaded.
e) Insert pipe into threading machine and thread with at least two passed.
The first to obtain the basic pitch thread (BS 21) and the polish off the
threads. These are termed the rough cut and the fine cut. Two passes
are also necessary so as not to damage the high tensile die.
f) Before removing the complete pipe, the completed threads need to be
checked by screwing in a Stainless-Steel pipe socket of the same
diameter into the threads. If the threaded pipe cannot penetrate at least
four (4) revolutions into the socket it means that the threads are not good
and needs to be redo.
g) Upon completing the threading of all the pipes, apply sealing (Teflon)
tape on to all the threaded joints. This should be done in a clock wise
rotation with the roll of tape moving away from you.
h) Sockets are next fixed onto one end of each completed pipe. This is
achieved either by locking the pipe on a vice and wrenching tight the
socket or by employing two wrenches in opposing directions.
i) Deliver all the above completed pipes with sockets to the site where they
are to be installed.
j) Mark the start and end points of the pipe to be installed on the soft fit of
the slab for horizontal installation or wall for vertical installation.
k) Drill both points marked using the hand drill, insert drop-in anchor and set
them.
l) Screw in two length of stud bolts into the drop-in anchor and pull a twine
from the first stud to the second stud.
m) From the twine, mark the intermediate hangers that are required between
the start and end points.
n) Repeat procedures (10) and (11) to complete the intermediate pipe
supports.
o) The pipes are now hanged onto the supports, jointed and tightened
together using pipe wrenches.

6. METHOD STATEMENT – COLD WATER PIPING WORK
pg. 6
p) When a significant section of pipes is completed or before it is to be
installed in a plumbing shaft, the pipes have to be tested by means of
hydrostatic pressure tests.
6.3 Work Flow Chart Installation of Stainless Steel
PREPARE SHOP
DRAWINGS FOR AREAS
OF WORK
SUBMIT TO
CLIENT/CONSULTANT
FOR APPROVAL
ORDER MATERIALS TO
BE INSTALLED
MATERIALS
INSPECTION BY
RE/COW
INSTALLED PIPING PRESSURE TEST PIPING
TEST INSPECTION BY
RE/COW
TEST FAIL
TEST PASS REPEAT TEST
CLOSE INSPECTION BY
RE/COW

7. METHOD STATEMENT – COLD WATER PIPING WORK
pg. 7
7.0 QUALITY CONTROL PROCEDURES
7.1 Verification Document
 Request For Inspection Form (RFI)
 Installation Checklist
 Test Form
8.0 SAFETY
Prior to work commencing all plant and equipment to be used will be inspected and
confirmed for used by contractor's safety representative.
Tool Box meeting shall be undertaken on a minimum weekly basis.