Types of Cisterns and Installation

plumbing nairobi cisternsA cistern is a waterproof receptacle for holding liquids, usually water. Cisterns are often built to catch and store water. Modern cisterns range in capacity from a few litres to thousands of cubic metres, effectively forming covered reservoirs

Cistern can be manufactured from galvanized mild steel (large non domestic mild steel) Polypropylene or glass reinforced plastics. They must be well insulated and supported on adequate bearers to spread the concentrated load.  Plastic cistern will require uniform support on boarding over bearers. A dust proof cover is essential to prevent contamination.

For large buildings cisterns are accommodated in a purpose made plant room at roof level or within the roof structure. This room must be well insulated and ventilated and be provided with thermostatic control of a heating facility where storage demands exceeds 4500litres. Cistern must be duplicated and interconnected. In the interest of load distribution this should be provided at much lower capacities. For maintenance and repairs each cistern must be capable of isolation and in depended operation

Bell Type CisternBell type: This form of flushing cistern is now virtually obsolete although some reproductions are available for use in keeping with refurbishment of historic premises. Cast iron may still be found in use in old factories, schools and similar established buildings. It is activated by the chain being pulled which also lifts the bell. As the chain is released the bell falls to displace water down the stand pipe effecting a siphon which empties the cistern. The whole process is very noisy

Disc Type Cistern
Disc Type Cistern

Disc Types: The disc types are manufactured in a variety of materials including plastics and ceramics for application to all categories of building. Depressing the lever raises the piston and water is displaced over the siphon. A siphonic action is created to empty the cistern some cistern incorporate on economy or dual flush siphon. When the lever is depressed and released promptly air passing through the vent pipe breaks the symphonic action to give a 4.5litres flush. When the lever is held down a 7.5 litre flush is obtained.

Flushing trough may be used as an alternative to several separate flushing cisterns where a range of WC is installed. They are particularly applicable to schools, factories and office sanitary accommodation. Trough installation is economic in equipment and time. It is also more efficient in use as there is no waiting between consecutive flashes. The disadvantage is if it needs maintenance or repair, the whole range of WCs are unusable. The trough may be bracketed from the rear wall and hidden from view by a false wall or ceiling

The siphon operated in the same manner as in separate cistern except that as water flows through the siphon air is drawn out of the air pipe. Water is therefore siphoned out of the anti siphon device, the flush terminated and the device refilled through the small hall

Automatic Flashing Cistern: Roger field flushing cistern is used for automatically flushing WCs. It has applications to children lavatories and other situations where the users are unable to operate a manual flush device. As the cistern fills, one in the pipe is gradually compressed.


For quality and affordable plumbing services in Nairobi and other counties in Kenya, Contact Nairobi Plumbing Company to schedule a free plumbing inspection on any of your plumbing equipments. We will advise you in all aspects – from repairs to installation. Your plumbing work will stay durable if the right materials and workmanship is applied appropriately