TABLE OF CONTENTS
1. Scope of Work………………………………………………………………………………Page No
2. Reference…………………………………………………………………………….……..Page No
3. Responsibilities.................................................................................................................
4. Control Measures………..………………………………………………..…………....Page No 5. Sequence of
Activities………………………………………………………………..……..Page No
6. Duct
Leak Test…………………………………………………………………………… Page No
7. Attachment……………………………………………………………………………………Page No
* SATIP
* SAIC
1. Scope of Work
1.1 This method statement explains the procedure of duct works, including
the duct installation, insulation, fixing of ducts accessories and duct leakage
testing (Light Test).
2. Reference
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
potential for harm.
4.2.3 All
personnel are issued with Personal Protective Equipment with FRC.
5. Sequence of Activities
5.1 Handling and
Storage of Ducts
5.1.1 Unload the duct by
hand/loader and store the duct inside the
Respective buildings or
workshop area.
5.2 Primary Step
5.2.1 Check approval of
working drawings.
5.2.2 Check site clearance
for work.
5.2.3 Check wall/slab
opening as per approved drawings.
5.2.4 Notify to client for
inspection of receiving factory made duct.
5.2.5 Assembled the
fabricated ducts at site with consultant/quality
Official for
correctness of construction.
5.3 Installation
& Insulation of Duct
5.3.1 For Internal Concealed
Duct, Mark the routing of the ducts and install
GI threaded rod and
supports.
5.3.2 Install the factory
made Duct as per IFC drawing.
5.3.3 Seal the duct joints
with approved sealant.
5.3.4 Apply sealant outside
of the duct between the gap and corner and also
Apply inside of the
duct (wherever it’s possible).
5.3.5 Stick self-adhesive
aluminum alloy sticker pins (1 pin/0.16 sq. m.) to
The bare duct
firmly.
5.3.6 Paste the bonding
adhesive glue on the bare duct.
5.3.7 All joints to be
insulate after completion of duct leak test (lightning test)
5.3.8 Approved fiber glass
insulation shall be fixed firmly on the duct.
5.3.9 Insulation shall be
overlapped by at least 100mm and shall be
Fastened with 65mm
wide aluminum foil tape and tape shall be
Overlapped by 15mm.
5.3.10 tight insulation with aluminum band.
5.3.11 Duct shall be clean and all open ends shall be covered in a
suitable
Manner to prevent
from dust and debris.
5.3.12 for internal exposed duct, same procedure shall be followed, and
Approved seal
coating with glass cloth covering shall be applied after
Insulation.
5.3.13 for external exposed duct, same procedure shall be followed, and
Approved aluminum
cladding (jacketing) shall be applied after
Insulation.
5.4 Installation
of Ducting Accessories, Access Doors, Dampers, Air Inlet & Outlet
Devices.
5.4.1 Check the dimension and location of the wall/slab/ceiling opening
as
Per the vendor
drawings wherever necessary.
5.4.2 Install access doors as per the approved drawing. (Beside each MVD
And FD). The VCD,
fire dampers, access doors, door grilles, test holes
And fresh air intakes shall be
installed only after the inspection of
Material as per
SAES.
5.4.3 Install the grilles & diffusers properly as per IFC drawings.
5.4.4 Install flexible duct with necessary support as per the IFC
drawings.
5.4.5 Connect the both ends of the flexible duct with stainless steel
clamp.
5.4.6 Fix. The louver, grilles and diffusers as per drawing.
6. Inspection
6.1 Duct Leak Test
6.1.1 Light test
shall be performed to determine that all joints are leak proof
And it will be performed by passing a lamp
having a power rating of not
Less
than 500 watts. (Selection of 500w in normal HVAC installation
Practice).
6.1.2 Light Power
rating not less than 500 watts, selection of 500 watts
Lightning shall be cover only 10 sq. m. ducting area. Additional
L\lights will be provided if the duct area is
more than 10 sq. m.
6.1.3 The insulation of ducts can be
carried out before light test,
But the joints should be free in order to be tested before insulation.
6.1.4 The test can be performed part by part
according to the site condition.
6.1.5 Insert the light inside the duct inspected,
move the light as near as
Possible
in each transverse joint, for the case of smaller duct, flood by
Light
each straight duct of 6 meters minimum length, then visual
Inspection
shall be performed from outside the perimeter joint to
Determine
the leak.
6.1.6 On witness
inspection, further activity shall be proceeded to conduct
Outright corrective action to seal the
identified leaks.
6.1.7 The
inspection shall be recorded and signed by the client inspector for
Record reference.
6.2 Final Inspection.
6.2.1
Ensured that all ventilation duct work shall be carried out in
Accordance with job specification and standards.
6.2.2
Red line mark-ups and as built drawing to be prepared
Incorporating the modifications if any for the installed ducting
Layout.
6.2.3 Final inspection to be made for installation of all ventilation
ducts
Work.
7. Attachment
·
JSA (Job Safety Analysis)
·
SATIP-K-001-03 (HVAC Metal
Duct System)
·
SAIC-K-4008 (Duct Hangers
and Supports Receiving Inspection, Metal Ducts Receiving Inspection, Duct
Insulation Receiving Inspection)
·
SAIC-K-4009 (Air Terminal
Devices & Flexible Connector Receiving Inspection)
·
SAIC-K-4010 (Fire Damper
Receiving Inspection)
·
SAIC-K-4011 ( Storage,
Handling and Preservation)
·
SAIC-K-4012 (Duct Hangers
and Supports including fasteners, etc.)
·
SAIC-K-4013 (Metal Duct
Inspection)
·
SAIC-K-4014 (Grease Duct
(Serving Type I hood or as applicable) Inspection)
·
SAIC-K-4015 ( Duct
Insulation Inspection)
·
SAIC-K-4016 (Duct
Accessories Inspection)
·
SAIC-K-4017 (Air Terminal
Devices & Flexible Connector Inspection)
·
SAIC-K-4018 (Fire Damper
Inspection)
·
SATR-K-4001 (Fire Damper
Functional Test)
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