TABLE OF CONTENTS
1. Scope of Work………………………………………………………………………Page No
2. Reference……………………………………………………………………………Page No
3 Responsibilities......................................................................................................Page No
4. Control Measures………..………………………………………………..…… Page No
5. Sequence of
Activities………………………………………………………………..Page No
6. Attachment……………………………………………………………………………Page No
* JSA (Job Safety Analysis)
* SATIP
* SAIC
1. Scope of Work
1.1 This method statement explains the installation Of the refrigerant
copper pipes, (including supports installation, pipes and fittings installation),
& pressure testing, vacuuming and charging of refrigerant system.
2. Reference Documents
2.1
Approved Drawings
2.2 Manufacturer’s Catalogues, Vendor Drawing
2.3
General Specifications for HVAC System
2.4
Material Submission for
HVAC Equipment/Materials
3. Responsibilities
3.1 Mechanical
/ HVAC Engineer
·
He shall be overall
responsible for the complete activity including, but not limited to:
3.1.1 Assigning
workman crew
3.1.2 Sequence of
activities to be carried out for the work as per this Method
Statement.
3.1.3 Stage
inspection & surveillance
3.1.4
Notification to client engineer for inspection and daily commissioning
activities.
3.1.5 Provide day
to day guidance and delegate works as necessary.
3.1.6 Ensure that
the equipment and tools required for carrying out the test are
available, maintained and used in safe manner.
3.1.7 Produce all
necessary records for the confirmation of testing works completed
and pass to QC inspector as required.
3.2 Mechanical/HVAC Supervisor
·
He shall be overall
responsible for the activity including, but not limited to:
3.2.1 Assigning worksman crew.
3.2.2 Sequence of activities to be carried out for the work.
3.2.3 Ensure the quality levels are maintained.
3.2.4 Ensure that the equipment and tools required for carrying out the test are
available,
maintained and used in safe manner.
3.3 QA/QC Inspector
3.3.1 Maintain records of quality control ckeck sheets / report formats
for the site
Tests and
inspection.
3.3.2 Carry out surveillance so as to ensure that the personel are
working i accor-
Dance with the approved standards.
3.3.3 Assurances of approved methods are being used for testing and
material
receipt inspection.
3.3.4 Verification of material approval and vendor certification.
4.
Control Measures
4.1 Quality Control
4.1.1 Ensure availability of latest released for construction drawings and
specifications.
4.1.2 Ensure the tools/equipment used for testing & commissioning purpose is
calibrated and certificates available.
4.2
Safety
4.2.1 All equipment and accessories have been certified for their capacity
And integrity.
4.2.2 Safety and risk assessment shall be performed for every job or task,
which has the
potential for harm.
4.2.3 All personnel are issued with Personal Protective Equipment.
4.2.4 Provide hand gloves and educate workers for safe operation.
4.2.5 Always keep the gas cylinder in vertical position.
4.2.6 Always keep fire extinguisher during brazing.
5. Sequence of Activities
5.1 Installation
Procedure
5.1.1 Check approval of
working drawings.
5.1.2 Check size and route of
piping for laying refrigerant pipe as per
approved drawing.
5.1.3 Install the supports for pipe
and check the levels.
5.1.4 Clean thoroughly the
outer face of the pipe and inner face of pipes
& fittings by
air blowing or brushing.
5.1.5 Prior to copper joint
brazing all cuts ends and particularly those
immediately
upstream of devices should be completely de-burred
and any distortion
in bore diameter shall be rectified.
5.1.6 Install the
refrigerant pipe care should be taken to ensure that flow
and regulating
devices (filter/drier, sight glass, solenoid valves,
isolation valves
(only for large capacity units) are installed correctly
with respected to flow
of direction.
5.1.7 Flush the entire pipe
system with nitrogen gas at 150~200psig to
remove all debris
inside the pipe.
5.1.8 Carry out the pressure
test by using Nitrogen gas at 250 psi for
24 Hrs. for check
the leakage and soap solution will be applied in case
of leak.
5.1.9 Record the readings in
the pressure test report.
5.1.10 Provide pipe insulation and
cladding for external refrigerant pipe with
the specified
insulation material.
5.1.11 Vacuum the system to
29 in. HG for 24hrs.
5.1.12 Break the vacuum using
refrigerant, raise pressure to zero (0) then
vacuum again for
24hrs.
5.1.13 Charge the system
with refrigerant up to its standing pressure
(operation
pressure).
5.1.14 System is ready for
start-up, commissioning and record the data.
6. Attachment
·
JSA (Job Safety Analysis)
·
SATIP-K-001-07 (Refrigerant
Piping)
·
SAIC-K-4025 (Refrigerant
Handling, Storage and Preservation/Refrigerant Receiving Inspection)
·
SAIC-K-4026 (Refrigerant
Piping (Copper), Fittings and Support Lay-Out Inspection)
·
SAIC-K-4027 (Air
Moving/Cooling Valve and Apparatus Arrangement Installation Inspection)
·
SATR-K-4003 (Refrigerant
Piping Pressure Test)
·
SATR-K-4004 (Refrigerant
Piping Vacuum Testing)
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