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METHOD STATEMENT
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METHOD STATEMENT FOR INSulation Of
duct and duct accessories
Project : * Insert Project Name here
Contractor : * Insert Contractor Name here
Document No. :
Document revision status : 1
1 05-24-2008 Issued for Review & Comments EM MT
Prepared by Checked by Approved by
Rev. Date Description
* Insert Contractor Name here
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REVISION CONTROL SHEET
REV. NO. DATE PAGE NO. DESCRIPTION
0 04-09-2008 ALL
1 05-24-2008 ALL
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TABLE OF CONTENTS
1. Introduction………..……………………………………………………………….. 4
2. Reference..………………………………………………………………………….. 4
3. General………………………………………………………………….…………….. 4
4. Responsibilities....………………………………………………………………….. 5
5. Materials Handling and Storage at Site..……………………………………….. 5
6. Tools and Equipments……......…………………………………………………… 6
7. Work Instruction..….………………………………………………………………… 6
8. Procedures………………………………………………………………………….… 7-8
9. Preparation and Installation………………………………………………………… 9-10
10. Safety……………………………………………………………………………………. 11
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1. INTRODUCTION :
This method statement deals with insulation of DUCTWORKS and DUCT
ACESSOREIS . before commencing insulation of ductworks , all insulation
materials must conform to approved material submittal and contract document.
The purpose of this document is to define the procedures for the above
mentioned work. The implementation of correct practices for insulating ductwork
and duct accessories though this general procedure containing herein.
2.REFERENCE
2.0 Contract Specification Section XX XX XX – Ductwork and 15820 – Duct
Accessories.
2.1 Specification Section XX XX XX – Duct Insulation
2.2 Applicable Related Section
3.GENERAL
Ductwork and Duct Accessories shall be insulated in accordance with the
requirements of all local codes and the following International Codes.
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3.0 ASTM
3.1 NFPA
3.2 SMACNA
4. RESPONSIBILITIES
4.0 All works associated with the above-mentioned project limited to insulation
of duct, duct accessories will be the responsibilities of the * Insert Contractor Name
here in accordance with the contract documents.
4.1 * Insert Contractor Name here responsibilities for the particular personnel are as
follows :
4.1.0 Project manager will have the overall responsibility for the execution
of the mechanical works.
4.1.1 The Planning Engineer will be responsible for the onward planning
requirements associated with the works the submission to Main
Contractor of all related Projects Plan.
4.1.2 The Senior Mechanical Engineer will be responsible for the technical
aspect of work.
4.1.3 The Site Mechanical Engineer will be in-charge for the execution of
work at site.
4.1.4 The QA/QC Engineer will be responsible for the quality control of
insulation of works and verification of installed material including
documentation and inspection.
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5. MATERIALS HANDLING AND STORAGE AT SITE
5.0 Necessary precaution shall be undertaken at the time of delivery of
materials from the supplier, to ensure that is labeled, satisfactorily packed
and there are no transit damages.
5.1 On receipt of material delivery on site, the materials should be carefully
off-loaded using adequate manpower and necessary equipment.
5.2 Materials shall be stored in a dry place and adequate cover provided
to ensure that not exposed to weather.
5.3 Materials are shift to place of work using adequate worker.
6. TOOLS AND EQUIPMENT
6.0 Installation Tools :
6.0.0 Scissors / Razor
6.0.1 Riveter Tools
6.0.2 Measuring Tape
6.0.3 Marker / Chalk Line
6.0.4 Drilling Machine
6.1 Electrical Supplies :
6.1.0 Flood Lights
6.1.1 Extension Cord/ Wire
6.1.2 Other Electrical Materials
6.2 Scaffolding :
6.2.0 Scaffolding (2 meter Height )
6.2.1 Mobile Scaffolding
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6.2.2 Normally Ladder ( Supply by Main Contractor )
7. WORK INSTRUCTION
7.0. The insulation of Ductwork and Duct Accessories carried out strictly in
accordance with Approved Submittal and Contract Documents.
7.1. A skilled craftsman conversant with the class somewhat work shall carry
out the insulation work.
8. PROCEDURES
8.0 General Requirements
8.0.0 Insulation Materials
8.0.1 Adhesives
8.0.2 Adhesive Tapes
8.0.3 Duct Pins, Clips, and Speed Washers
8.0.4 Canvas Cloth
8.0.5 Coating
8.0.6 Aluminum Cladding if Required
8.1 Insulation Types and Application
8.1.0 Indoor Rectangular Supply , Return and Fresh Air Duct in
conditioned space.
The insulation materials will be afico fiberglass flexible
blanket comply with ASTM C-553 Type II . Density of
1.5 ib/ cu.ft. (24 kg/ cu. M.) with a K factor of 0.24
Btu.in. /sq.ft.hr.F 9 0.035 W/m.K.)at a mean temperature
of 77 F (25 deg. C ) . The jacket is factor applied glass
reinforced flame retardant kraft laminated aluminum foil
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on one side. The afico glass fiber are non-combustible
materials when tested as per BS 476 ( Part 4), ASTM
E-84 and E- 136. The reinforced aluminum foil/ kraft
laminated facing ( FSK) are UL classified as Flame
Spread = 15 and smoke developed = 0. Standard length
size of blanket/ roll is 1200mmx10000mm with a
thickness of 40mm . Vapor permeability of 0.00279
perms.
8.1.1 Outdoor for Rectangular Duct Supply, Return and Fresh Air.
Afico fiberglass rigid board insulation and roll comply with ASTM
C-612 type 1B with a density of 3 lb/cu.ft. ( 48nkg/ cu. M.).
the K factor is 0.22 btu.in/sq.ft.hr.F (0.013 W/m.K ) at a mean
temperature of 77 F ( 25 deg. C). The jacketing is factory
applied glass reinforced flame retardant kraft laminated aluminum
foil on one side. Fire classification is non-combustible when tested
as per BS 476 (Part 4) , ASTM E-84 and E-136. The rigid board
insulation is sullied in standard size of 1200mm x 1000mm with
thickness of 50mm and vapor permeability of 0.00279 perms.
Glass reinforced aluminum foil /kraft laminated facing (FSK) are
UL classified of flame spread of 15 and smoke developed zero.
8.1.2 Flexible Duct specification.
The flexible duct will be use for connection to grilles and register
from the main duct. It comply with UL standard of 181 Class 1.
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The ATCO # 50 series comply with specification as per material
submittal M-150 . The # 30 series insulated round duct with an outer
jacket enclosing 32mm thick and with R-valve of 4.2 for the inner
core. And a double layer core is wrapped in a thick blanket of
fiberglass insulation and sheathed in a rugged metalized polyester
jacket as per MAR # M-150. It complies with the pressure rating of 6
inches W.G. ( 1500 Pa ) positive and 0.5 inch W.G. (125 Pa )
negative pressure.
9. PREPARATION AND INSTALLATION
9.0 Insulate duct before installation on site for low pressure rating
9.1 Before insulation of duct to proceed, executed at site workshop,
check , and make sure that available shop drawing on hand is ,
approved.
9.2 Ensure insulation materials and accessories to use are correct and
comply to approved materials submittal by verifying the label and/or
markings by manufacturer.
9.3 Check with the duct installer on site the coordination clearance of
requirement as well as end connection assembly.
9.4 The duct (s) to insulate must have a minimum clearance of 50 mm.
from insulation to end connection to accommodate joining of duct (s)
at site.
9.5 After compliance of the above sequence of check , typical fixing of
insulation can proceed.
9.6 Ensure surface of duct is dry and free from dust or grease. Cut
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insulation to required length to fit around the duct making sure that
edges are straight.
9.7 Apply insulation adhesive to duct surface in strip approximate 15 cm
wide. Underside of duct should be completely coated to prevent
sagging.
9.8 For installation of anchor pin and speed washer on side and bottom
of horizontal duct and sides of vertical duct should be follow specs
section 15081 / 3.4A3 & B3.
9.9 As per manufacturer’s recommendation- depending on size of duct
fit two or more rows of insulation fixing pins to each face of the duct
at center of 30 to 50 cm. pins are self adhesive type.
9.10 Carefully position insulation over the pins, pressing firmly so those
pin penetrate through the insulation. Fit lock washers over pins
pushing them down until tight against insulation. Snip off any excess
shank from pin. Seal all joints and opening with self adhesive tape.
9.11 For duct without pins application, wrap insulation , foil face up, to the
prepared duct surface once adhesive become tacky, making sure
that all edge joints are closely butted.
9.12 Apply uniform hand pressure to outside surface of insulation to
obtain good bond.
9.13 Sealing of joints and seams with vapor – retardant mastic of
insulated duct indicated to receive vapor retardant.
9.14 Apply insulation in a tight manner to longitudinal seams joints, with
a least number of joints, and bond seams and joints with adhesive.
9.15 Apply by brush the continuous thermal and vapor retardant mastic
( Foster 30-36) along the insulation without affecting the integrity of
applied insulation.
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9.16 Place canvas cloth ( 8- oz. / sq. yd.) jacket smooth and tight to the
surface with 50 mm overlap at seams and joints.
9.17 Completely wrap insulation with jacket , leaving no expose raw
insulation . After setting to final surface , apply mastic by brush to
finish.
9.18 Keep insulated duct dry after application of coating.
9.19 All internal insulated duct shall have reinforcement foil face and
frame resistance kraft vapor barrier.
9.20 Extra care for the finished insulated during handling and
transporting to site.
9.21 Upon installation of ductwork on site , insulation between duct and
duct support using 100 mm width galvanized sheet metal
underneath to serve as protection.
9.22 Where insulated ductwork passes through fire rated partition /wall ,
and floor ,to provide a sleeve. The insulation terminates at the face
of the walls, filling the gap with fire stopping mineral wool and
finishes with fire resistant sealant.
9.23 All supply and return ductwork exposed to atmosphere should have
insulated and covered with aluminum cladding of 1-mil (0.25mm)
thick to serve as jacket .
9.24 After successful completion of installation and all joints are proved
for sound insulation the QA/QC Engineer will offer for inspection and
approval to the Main Contractor and the Company.
9.25 After completion of insulation work on site , the area involved should
be clean and clear of excess materials.
10. SAFETY
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10.0 All insulation work will be under taken in accordance with Aster
Safety Plan and the Main Contractor Safety Rules and Regulation.
10.1 All site personnel should have the necessary personal protective
gadget like headgear, pair of safety shoes and gloves , safety belt
goggles , that wearing at all times if require at site.
10.2 All site work activities will be kept in a clean and tidy condition.
----------------------------Procedure Ends---------------------
GENERAL INFORMATION
THIS DOCUMENT IS ENTENDED FOR REFRENCE PURPOSES
ONLY. YOU CAN EDIT & MODIFY THE CONTENT.
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