Domestic Cold-Water Supply Systems

What is the definition of a domestic water supply system?

What are the advantages of Direct Cold Water Supply Systems?

• Saving in pipe work especially in multistory building.

• Fresh drinking water may be obtained at any point.

• There is a danger of foul water from the sanitary fittings being siphoned back into the main water.

• During peak periods there is a tendency for the lowering of pressure.

What is the purpose of a pressure reducing valve in a direct cold water supply system?

What are the advantages of Indirect Cold Water Supply Systems?

• Impose less pressure on distribution network.

• There is no threat of pipe burst.

• Water leakages are less because water pressure will be less.

• Water stored in storage tank degraded over a period of time.

What are the disadvantages of Indirect Cold Water Supply Systems?

• Storage water tanks are kept on roof top causing pressure issues.

• Potable water may not be available at all taps.

• The tank will always need maintenance and may create problem of leakages.

• The tank adds cost to the building.

What is a cistern in the context of water supply systems?

What is the difference between a stopcock and a gate valve?

• A stopcock requires water pressure to operate.

• A gate valve does not require water pressure to operate.

• A stopcock is used on raising mains.

• A gate valve is used on water feeds from a gravity fed tank.

What is the purpose of a water company stopcock?

• To cut off all the water to the premises.

• To isolate the rising main from the storage tank.

• To drain the rising main within the house.

• To control the water stored in the tank.

What should be done periodically with the water company stopcock?

• Check that it's working.

• Replace it with a new one.

• Paint it for visibility.

• Move it to a different location.

What is the capacity range of a typical storage tank?

• 100 to 200 liters

• 230 to 360 liters

• 400 to 500 liters

• 50 to 80 gallons