Method Statement Irrigation Systems Piping

Only approved material shall be used. Delivered material shall be stored at stores and shall always be subject to client’s representative inspection. Special shaded pipe racks shall be constructed to store pipes. Fittings and irrigation materials shall be stored inside containers that will be kept closed at all times.

Transportation: All materials will be transported to site with due care and protection as per manufacture’s recommendations. uPVC or trailer and will never be dragged or dropped on the ground.

Material Inspection: All materials received will be inspected for make as per approvals, size and damages. Materials found unsuitable shall be removed from site.

Protection: All materials shall be shipped or otherwise conveyed in such a manner as to assure no damage. All boxes shall be securely sealed and clearly marked with the name of the manufacturer. All pipes shall be protected from crimping, crushing and splitting. All non-metallic system components shall be protected from sunlight exposure as per manufacturer’s recommendations.

Works and materials shall be protected from damage during storage, handling and construction. Particularly, non-metallic pipes and fittings shall be protected from direct sunlight during storage. Facilities of the necessary dimensions shall be provided and maintained for storage of all non-metallic irrigation materials in their entirety. All non-metallic materials shall be handled carefully and stored under cover to avoid damage. Pipes that have been damaged or dented will not be used in this work and to be removal from the site immediately.

Openings into the system, apparatus and equipment shall be securely covered, both before and after being set in place, to prevent obstruction in the pipes and the breakage, misuse or disfigurement of the apparatus or equipment.

Barricades, guards, warning signs and lights as necessary or required, for the protection of the public and the work force shall be provided.

All open ends shall be close by end cap provided by manufacture /supplier.

Utilities: The location of the existing underground utilities shall be determined and the works performed in a manner which will avoid possible damage. Hand excavation, as required shall be carried out to minimize the possibility of damage to existing underground utilities.

Irrigation Pipe Placing and Laying

• The pipe shall be fixed in the basement first floor up to second floor areas by using clamp with rubber that to prevent the vibration of the pipe. The clamp is female threaded size 10mm to hanging this clamp with the pipe in the concrete slab in the basement by using GI threaded part (as per the site condition). This threaded part shall be fixed in the concrete slab by using fixed bolt.
• Jointing: Pipe joints of uPVC shall be installed in accordance with recommendations of the manufacturer. Excess jointing material shall be removed.
• uPVC male adapters with specified threaded joint compounds to make connections between plastic pipe and valves shall be used as detailed, and tightened with light wrench pressure.
• Concrete Thrust Blocks shall be constructed on main pipelines at all changes in direction or size. The thrust blocks shall be un-reinforced concrete and shall have a minimum dimension of 300mm. The pipe lines shall be located centrally in the thrust blocks.
• All primary and secondary irrigation piping shall be buried to the depths as shown on the drawings.

Closing of Pipe and Flushing Lines:

• Closing: Openings in piping systems shall be capped or plugged, leaving caps and plugs in place until removal is necessary for completion of the installation. Dirt and debris shall be prevented from entering pipe or equipment.
• Flushing: All pipes and tubing shall be thoroughly flushed out.

Pressure Testing

• Prepare for hydrostatic testing of the main line only. Slowly fill the pipe with water, taking care to evacuate all entrapped air in the process. Pressure Test of main lines shall be 7 bar (1.5 times operation pressure) for a period of 6 hours. The pipe length to be tested shall be blanked off using an end caps with adapter facilities for connection of test equipment.

• Install test heads with provision of bleeding air vent at the highest point.

• Install test head with provision of filling water at the lowest point of the pipeline. Calibrated pressure gauges shall be installed at 1 end of the pipeline.

• During the water filling all air in the pipeline shall be expelled through the air bleeding nozzles installed at the highest points.

• Request for inspection of the pressure test by the Consultant or Inspector and get the same witnessed.

• Complete the back filling leaving the location of end capped solenoid valves risers exposed.
• Testing of pipes shall be carried out for main line only.