METHOD STATEMENT DRAINAGE WORK

Contents:

1. Objective
2.  Scope
3. References
4. Material
5. Material Procurement, Handling and Storage
6. Procedure of works
7. Test

1. Objective

This method statement provides information concerning the method of construction to ensure compliance with contract requirements, drawing, technical specification and quality control to provide a successful installation, testing, and commissioning of the Installation of uPVC Pipes.

• Scope

HAC shall supply and install in accordance with the specification of material and workmanship of drainage & condensate piping.

HAC shall complete install works, testing, witness testing at the site by the engineer, testing and commissioning of the drainage & plumbing work.

• References

• Contract Specifications.
• Material Submittal.
• Technical Literature for Manufacturer.
• Design Drawings.
• Shop Drawings.

• Material

• Pipes are Al Amal uPVC Pipes, ASTM D1785 SCH40
• Fittings are EEPCO UPVC Fittings
• Joints are Solvent Cement

• Material Procurement, Handling and Storage

• Upon approval of the material and shop drawing submittals, Contractor shall survey the QTY including fittings as per approved shop drawing and purchase the material as per project schedule.
•   Upon delivery to site, all pipes and fittings shall be stored indoor, in a clean, dry and ventilated place.
• Revise supplier’s delivery to match with project schedule.

• Procedure of works

• HAC carries out works as per approved Method Statement, drawings etc.
• The working area shall be protected as per risk assessment and HS&E plan.
• Open an approved shop drawings. This shop drawings consist of approved
• Toilet details and mechanical pipe sleeves location for both indoor unit refrigeration pipes and sanitary fixtures ventilation. Block work (except the shaft walls) and water proofing activity should be done first before installation.
• Waiting pipes, stub pipes and fittings from risers and underground pipes should be present before starting inside the toilet     
• Assign the location of pipes in the wall or floor that is exactly as mention on the approved toilet details shop drawing. Mark with the line corresponds to the total area to bury the pipe in the wall or floor (for lavatory and A/C drain).
• Use block cutter or simply portable grinder to cut a side of block continuously along the line that had been marked. Absolute care should be done not to cut or damaged the pre-installed pipe sleeves of fixture vents and A/C indoor unit.
• By using sharp- pointed steel rod and other proper chipping tools, chip the block side to the thickness required to fix the sanitary pipes.
• Standard fittings and materials must be used and all pipes and fittings must be joined using the approved glue. Sanitary tee fittings for vent be fixed inclined 45° or slope from center line of pipe it serve.
• Level of the slab should be identified by surveyor before proceeding installation. Also locate points as alternative reference point for pipe and pipe fittings installation.
• Install / layout the pipes at designated height, location and slopes (1% slope for sanitary fixtures and 0.5% slope for A/C drain). Sanitary fixtures outlet location should also be installed and identified.
• Connection of drainage pipes other than water closet drain (i.e. A/C drain, lavatory drain, bathtub drain and shower tray drain) should be slope toward gully trap floor drain based on the approved toilet details shop drawings.
• Absolute care should be imposed not to damage the water proofing upon installation.
• Install sleeves for pipes passing through the concrete walls. Put sealant in between the pipes and sleeves. 
• Check the pipes securely fixed, joint and capped before leak testing.

•  Test
• Leak test for the installed pipes is to be carried-out with presence of inspector Engineer.
• Cap end or plug as required and fill with water to produce 3 meters head (if applicable) at highest point of section tested. Let stand with no loss of level for a period of four hours.

After the approval of Inspector Engineer, cover the pipes with cement plaster or sand to where it is applicable