METHOD STATEMENT

METHOD STATEMENT

  1. Upon receipt of approved construction drawing, the drawing shall be tagged and a statistical printout of the parts shall be made and forwarded to site engineer for approval.
  2. Upon receipt of approval of tagged list, the fabrication shall be stated.
  3. The Ducts of HVAC system shall be fabricated out of Hot Dipped Galvanized Steel Coil as approved by Consultants and/or DW 142 /  ASHRAE / SMACNA.
  4. Straight ducts shall be manufactured on Computer Controlled fully Automatic Coil Line Machine.
  5. Grooved Corner Seam shall be used on the longitudinal joint of straight ducts. Automatic RAS sem closing machine shall be used for the purpose.
  6. Z-profile pleating will be provided for sheet stiffening at 150mm pitch.
  7. Fittings shall be fabricated on Computer Controlled Plasma Cutting System and assembling shall be done by using Pittsburgh Lock Seam.
  8. Seam closing shall be done by pneumatically operated guns, for a smooth finish.
  9. On ducting with S and C joints, C seam on the straight and duct fittings shall be achieved by pneumatically Operated Cleat-bender to 180 deg. Bend, to receive the Drive Slip.
  10. Minimum sheet thickness shall be filled as per Duct Construction table approved by Consultant.
  11. Ducts up to maximum certain size on larger dimension, slip joint shall be used.
  12. For the ducts above a certain size as per specification proprietary slide on flanges shall be fixed on the ducts in the factory, if required & ordered by client/contractor. Size of the flanges shall be selected as per Duct Construction Table approved by Consultants. Flanges shall be fitted automatically by Automatic Press-joining Clinching Technique to achieve a quality joint.
  13. Sealant shall be applied circumferentially to the transverse joints of ducts fitted with slide-on flanges, if required by the specification and ordered by client/contractor.
  14. Machine connections, Suit at site Piece, Droppers, shall be measured by installation contractor and sent to the factory for fabrication.
  15. Ducts shall be delivered to site in the side-bodies trucks.
  16. For the details on construction, refer relevant Duct Construction table.
  17. For Quality Control, refer to detailed enclosed quality control procedure and form for further details.