METHOD STATEMENT WATER SUPPLY 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 PP-R Pipes.

• Scope

HAC shall supply and install in accordance with the specification of material and workmanship of domestic water piping.

HAC shall complete install works, testing, witness testing at the site by the engineer, testing and commissioning of the water supply work.

• References

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

• Material

• Pipes are Baenninger  PP-R pipes (G 8200), according to DIN 8078
• Fittings are Baenninger  PP-R fittings according to DIN 16962 part 5A
• Isolating Valves are Baenninger  PP-R Ball Valve model G8850.
• Joints are Thermal welding to DIN standard

• 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. These shop drawings consist of approved toilet details and mechanical pipe sleeves location for indoor sanitary fixtures. Block work (except the shaft walls) and water proofing activity should be done first before installation.
• Marking of references or grid line for floor finish level.
• Waiting pipes, stub pipes and fittings from risers should be present before starting inside the toilet.         
• Assign the location of pipes in the wall or ceiling 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 ceiling.
• 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.
• By using sharp- pointed steel rod and other proper chipping tools, chip the block side to the width and depth required to fix the pipes.
• Standard fittings and materials must be used.
• Joints of pipes shall be as per manufacturer recommendations (attached).
• Supports size, and location shall be as per approved shop drawings and details.
• Install the Isolating Valves as per the approved 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
• Fill with water and test to 1-1/2 times the system working pressure but not less than 1380 kPa with no loss in pressure for a period of one hour. Test to include all valves if designed to withstand such pressure.
• No leakage shall be found at any section of the tested installation.
• After the approval of Inspector Engineer, cover the pipes with cement plaster or sand to where it is applicable.
• Keep the system under pressure until finishing all the work in the toilets.