HVAC Duct Installation Methods


In this Article we are going to see Installation of HVAC Duct work Methods and Statements.


HVAC Duct work
Installation of HVAC Duct work



SCOPE AND PURPOSE:

This Method Statement covers the on site installation of HVAC duct work and accessories and the requirement of checks to be carried out.

 

REFERENCE DOCUMENTS:

  • Project Specifications,
  • Approved shop drawings (latest revision),
  • Approved material submittals,
  • Duct work standard OW 144,


GENERAL MATERIALS:

HVAC duct work generally includes all types of 

  • Supply Air Duct, 
  • Return Air Duct, 
  • Exhaust Air Duct 

and their accessories such as: 

Duct Accessories
Duct Accessories
  • Duct elbows, 
  • Offsets, 
  • Transformation pieces branch off pieces , 
  • Tee connections, 
  • Access doors, 
  • Fire Dampers, 
  • Volume Control Dampers, 
  • Sound Attenuators , 
  • Flex able ducting and insulation.

 

GENERAL EQUIPMENT:

Equipment

  • Portable grinding Machine,
  • Drilling Machine,
  • Sheet metal cutting tools and bender,
  • Spirit level,
  • Scaffolding,
  • Duct erector hand tools,
  • Testing instruments,
  • Air Compressor,

RESPONSIBLE PERSONNEL:

  • Project Engineers,
  • Construction In-Charge,
  • Site Engineer and Site supervisor,
  • QA and QC Inspectors,
  • Safety officer,
  • Site Foremen,
  • Pipe fitters and Welders,
  • Helpers,

METHOD OF PRE-INSTALLATION:

Installation of HVAC Duct work

  • Ensure that approved material required to carryout work will be available.
  • Prior to commencement of work, area and access will be inspected to confirm that the site is ready to commence the work.
  • All relevant documentation and material applicable to particular section of works will be checked by site    engineer before commencement.
  • Physical verification of material will be carried out for any damages prior to taking from stores.
  • The site engineer or supervisor will give necessary instruction to tradesman and provide necessary  construction  shop drawings.
  • The site engineer or supervisor will also check that tools and equipment available are in compliance to contract requirements.
  • The site supervisor also explains tradesman regarding safety pre-cautions to be observed.
  • Prior to Leak testing, Site Engineer will ensure that Calibrated test kit is available and are in good   condition.


METHOD OF INSTALLATION


Installation of HVAC Duct work

  1. Prior to commencement of work coordination will be done with other
  2. Determine the position of duct supports as per approved construction layouts and specification.
  3. Prepare and fix the duct supports as per approved construction drawing and specification.
  4. Any cut edges of angles, channels or threaded rods will be touch up with Zinc rich paint.
  5. Transport the Duct pieces and fittings to final location.
  6. Pre-assemble the Duct pieces'' and fittings as per approved shop drawing ensuring the alignment.
  7. Acoustic insulation will be carried out wherever required.
  8. Raise the duct work on to the supports ensuring that each length is aligned with preceding length as per dimensions shown on approved shop Drawings.
  9. Approved duct sealant shall be applied on the joints. Any excess sealant so that the joint left in clean and tidy condition.
  10. Ensure that duct work is clean and no tools/ construction debris exists within duct work before proceeding to next length.
  11. All open ends of the duct works shall be temporarily sealed with polythene sheets/ply wood before leaving the job site to prevent moisture and dirt.
  12. Ensure that all accessories like Volume control dampers, Fire dampers,Access doors,Testpoints, Sensors are installed in accordance with approved shop drawings.
  13. Install Sound Attenuators according to approved shop drawings.
  14. Installation of duct work (complete with accessories) shall be checked before applying insulation at joints.
  15. Leak test will be carried out for duct work as applicable in DW 144 standard.
  16. Insulation of duct work will be completed as per manufacturer's recommendations (copy-enclosed).
  17. Ensure the duct surface is clean and dry before applying any insulation material.
  18. Ensure the thickness of insulation as per approved shop drawing.
  19. Ensure that all edge joints are closely butted and ends are flush and seated properly.
  20. Apply ALUGLASS Tape (Self Adhesive Aluminum Foil Laminated on Glassfabric) at Joints of insulation.
  21. Ensure the continuity of vapor barrier and other protective coatings on insulation surface as well as at connections.
  22. Ensure firm adherence of insulation around ducting by using approved adhesive between sheet metal and Insulation material.
  23. Where insulated duct work passes through fire rated wall/partitions the gap between sleeve and duct work shall be filled with approved fire barrier.

QUALITY CONTROL

  • QCE along with Project Engineer and site Supervisor will monitor that all components are installed as per the contract specifications and approved submittals.
  • Inspection Request (IR) shall be submitted to the Main Contractor/Consultant  during the following stages:

1.     After completion of installation before testing,

2.     Leak testing of duct work,

3.     After complete insulation,


SAFETY:

Installation of HVAC Duct work

  • Work will commence as per safety regulations laid down in the contract specification and project safety  plan.
  • Proper safety harness to be used and secured, if required.
  • All personal protective equipment shall be used as appropriate according to the nature of job.
  • Housekeeping shall be of good standard and all cut lengths and debris shall be removed.
  • Good ventilation for duct work insulation shall be ensured.

 

Well we hope this Article is useful to you,  Thank you for Visiting our blog,  Have a great day, 


Video Links:

1. HVAC ductwork methods and statements : https://youtu.be/_2o_089Vq40

2. Spiral Round Duct Installation : https://youtu.be/MJtHQQRwQUs

3. Chilled Water System Installation : https://youtu.be/ZLkj3FBZKxA

4. Fan Coil Unit Installation : https://youtu.be/QsrCFCGqTSc

5. METHOD STATEMENT FOR INSTALLATION OF FAN : https://youtu.be/g-g0DnNnTr0 

6. Chilled Water Pumps Installation Methods : https://youtu.be/2BQunmmA1Nk

7. Air Handling Unit Installation : https://youtu.be/6Bl-kGMVBuM    



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