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Method of Statement of Duct Accessories

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Method of Statement of Duct  Accessories Powered By Docstoc
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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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                                      METHOD STATEMENT
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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


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Description: Method of Statement of Duct Accessories