METHOD STATEMENT FOR HVAC DUCT WORK INSTALLATION
METHOD STATEMENT FOR HVAC DUCT WORK INSTALLATION
1.0. PURPOSE
This method statement covers the onsite installation of pre-fabricated ductwork systems manufactured from hot-dipped galvanized steel sheets.
2.0. SCOPE OF WORK
This method statement is to define the following:
2.1. Method to be used to ensure that prefabricated ducting is correct and acceptable,
2.2. Bracketing,
2.3. In-line equipment installation
2.4. Final connections and workmanship are correct and acceptable,
2.5. Conforming to the contract documents and General Specifications.
2.6. Material to be submitted for review by the Client
3.0. RESPONSIBLE PERSONNEL
3.1. Construction Manager
3.2. Mechanical Superintendent.
3.3. Warehouse Controller
3.4. Q.C. Engineer/Inspector
4.0. METHOD – PRE-INSTALLATION
4.1. All materials, drawings and other documentation related to a particular section of HVAC Duct Work Installation will be closely examined by the Construction Department before the START of installation work making sure that these are of the right type as reviewed & evaluated by the main client, contractor, and sub-contractor.
4.2. Before proceeding or starting any construction works, pre-inspections will be conducted on all materials before they leave the storage area.
4.3. Before proceeding with any construction works, areas and access will be properly and closely examined by the Construction Team to ensure that they are in an appropriate state for construction works to proceed. The Client will be invited to attend this inspection at his wisdom.
4.4. A close c with other trades will be conducted on coordination of the worksite before work starts.
4.5. A safe, secure and proper access controlled storage area will be designated on-site, in close coordination with the employer.
5.0. METHOD OF INSTALLATION
5.1. The project/site Supervisor will advise the tradesmen about the execution of the installation works and will an all mandatory approved construction drawings of the newer revision.
5.2. The project/site Supervisor will also closely examine that all mandatory and required tools and equipment are readily available by the contract requirements.
5.3. Make sure that horizontal ductwork is appropriately supported at equal distances per a newer version and updated Construction Drawings with all brackets fixed to the vertical face of ribbed beams of the structure.
5.4. Great care and initiative will be taken during the setting out stage, that ductwork runs between ceiling module lines to maintain maximum flexibility for any future relocation of lighting fixtures or other services regarding the HVAC system.
5.5. HVAC ductwork supports unless otherwise indicated will be installed to provide a minimum space of 15 millimetres between finished covering and adjacent work, and 100 millimetres clearance from suspended ceiling work.
5.6. Proper and secure supports or hangers will be placed within 300 millimetres of any 45° – 90° bend.
5.7. The screwed drop rods will have thread adjustment in either direction available after levelling of ductwork and allied plenum boxes.
5.8. The Ducts will be supported and secured within 300 millimeters of mating flanges or joints.
5.9. As indicated on relevant approved construction drawings where more than one duct can be supported on one hanger – the size of the hanger will be examined on the sum of the maximum widths.
5.10. The ductwork passing through walls and floors will be securely supported on both on-fire-rated sides.
5.11. All locknuts are secured accurately. At all open ends check for debris/wastes then cover with proper material to safeguard any entrance of debris pests/insects, or mist.
5.12. The project supervisor must make sure that there are no dents, distortions or buckling of ducting during HVAC duct installation being aware that damaged sheet metal work will be rejected.
5.13. The proper supports are to be adjusted at accurate levels checking the bracket material is compatible with the installation and the correct methodology used for thermal insulation.
To download the complete file, click on the link given below: