Section 15400 PLUMBING
15400.1 Scope Of Work
The Contractor shall furnish all labour, materials, equipment, tools, appurtenances, services and temporary work to provide complete plumbing works all in perfect working order. This work shall include but not to limited to the following:
• Sanitary fixture.
• Water supply system.
• Soil, waste and venting system.
• Rain water services.
• Pumps, calorifiers, etc.
• Testing: of all piping systems and equipment and other devices to demonstrate that the entire installations are in perfect working order.
• As-built drawings.
• Builders work: s required.
All materials shall be brand new bearing stamped ratings as required and must be approved by the Engineer prior to their use.
The foregoing sub paragraphs are not intended to itemize all works required by this section of the specification and are only for the purpose of outlining the extent of work.
15400.2 Description Of Work
Individual water heater shall be used to generate hot water to kitchen and toilets as indicated on drawings. All floors are supplied through pressurizing unit to maintain 3 bar at all points.
Soil and waste water from all fixtures discharge to the outside and carried in a set of concrete manholes to the public areas to connect with D.M. drainage system.
Storm water from all roofs is discharged outside through a network of roof drain and riser pipes.
15400.3 Testing
The Contractor shall submit to the Engineer prior to the date of commencement of the tests his proposed test procedure. The procedure method and points of measurement as well as the method of calculation, shall be approved by the Engineer before any test is carried out.
The Contractor shall supply skilled staff and all necessary instruments and carry out any test of any kind on a piece of equipment, apparatus, part of a system or on a complete system if the Engineer requests such a test for determining specified or guaranteed date as given in the specifications.
Any damage resulting from the test shall be repaired and/or damaged material replaced, all to the satisfaction of the Engineer.
In the event of any repair or any adjustment having to be made, other than normal running adjustment, the test shall be void and shall be recommenced after the adjustment or repairs have been completed.
The test shall not be made void due to circumstances beyond the Contractor’s control.
15400.3.1 Water Supply System
All testing, balancing and final adjustment shall be in accordance with the provision of the applicable B.S. code of practice.
All water installations shall be flushed out with clean water. This shall be preceded by chemical cleaning, while flushing out all times which could be damaged (like fillers...) shall be excluded. Disinfection of portable water system shall be as follows:
Thoroughly flush the pipework and storage system to remove all debris and dirt.
Once the water runs clear close all taps.
Refill the tank with water and add suffiecient quantity of approved manufacturers hypochloride solution to achieve 50ppm of residual chlorine in the following water.
The water should be tested from the most distant point before closing the taps.
Once the desired 50ppm of chlorine is achieved close all taps and allow system to remain sterilized for 24 hours.
From the preiously chosen sample points test the water to ensure that minimum of 10ppm of chlorine is present. Once 10ppm is available flush the piping until chlorine is
removed.
Check for the absence of bacteria from a minimum two points using total bacterial dip slides.
All water supply piping shall be tested under hydrostatic pressure of not less than 1 ½ times working pressure or 100psi whichever is greater and shall be maintained for twelve hours.
This test shall be applied to separate lengths of pipework before final connection of equipment and appliances but after all piping is complete systems shall also be flushed.
Test shall be completed and approved before pipe valves and fittings have been concealed.
15400.3.2 Drainage, Soil Waste and Venting Systems
These systems shall be subject to a water test prior to being covered and also tested for water
tightness after backfilling.
On any section of the pipe under test the head of water applied shall not be less than 3.00 meters and not greater than 6.00 meters. Test shall be maintained for eight hours, and any defects shall be rectified and the test reapplied to the complete satisfaction of the Engineer.
Pipes shall UPVC to BS 4514/5255, brown for underground and gray for above ground. All condensable piping shall be installed with foam rubber tape insulation throughout. Manhole covers shall be to BS 497. Duty as per drawings. All soil and waste stacks to be extended to roof level for ventilation purpose.
15400.3.3 Pumps & Control
The pumps shall be tested for actual gpm against design gpm, actual shut off head against design shut off head, operating suction and discharge pressure, r.p.m. and b.h.p.
All control shall be tested for proper functioning in accordance with the requirements of the specifications.
15400.3.4 Final Testing
In addition to the above, final tests shall be carried out as directed by the Engineer just before final completion of the works and during the maintenance period.