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An indirect water supply system is the most common type found in modern houses. The mains water comes in via a rising main and directly feeds at least one cold tap at the kitchen sink with ‘potable’ water (i.e. water which is fit for drinking, cooking etc) and may also feed a washing machine, a shower and an outside tap etc.
Indirect System of Cold Water Supply •The indirect system of cold water supply has only one drinking water outlet, at the sink. The cold water storage cistern has a minimum capacity of 230 liters, for location in the roof space. In addition to its normal supply function, it provides an adequate emergency
The first (diagram 1 and 2 below), uses water supplied ‘directly’ from the water main, called a direct system and the other method (diagram 3 below) uses a storage tank (cistern) to give a store of cold water, then distributes the water around the home, known as an indirect system.
The indirect system of cold water supply has only one drinking water outlet, at the sink. The cold water storage cistern has a minimum capacity of 230 litres, for location in the roof space. The high-rise cold water supply systems have a non-return valve fitted to the outlet of each booster pump.
The provision of a cold water supply to a building is often to satisfy three demands: water for drinking, water for general usage, and water for fire fighting. In the United Kingdom it is a statutory requirement of the Water Acts1 that every dwelling shall be supplied with drinking water.
In building services applications, water is used in many ways. Briefly, these are as follows: cold water for drinking; cold water supplied to a domestic hot water cylinder or boiler for domestic washing or in dustrial process purposes;
