Boosted water supplies

Boosted water supplies are made up of a cold water storage tank. This tank supplies a set of electronically controlled pumps. The water from the pump rises up through a large riser pipe and then into the building. Smaller pipes that off-shoot from the riser pipe provide water for each floor. The pumps have a non-return valve which stops the water from draining back into the tank when the pumps are switched off.  An accumulator tank is also fitted close to the pumps.

Accumulators store pressurised energy. Accumulators allow the Pumps to be switched off for a short period of time with no loss of Mains Water Supply.  An accumulator will only work if. It has been charged with air which is less pressurised than the boosted water supply.

boosted water supplies

The main cause of large pressure surges in boosted water supplies are. The high-speed filling of the riser pipe work. The following occurrences can cause pressure surges and  power cuts. The pumps being switched off for maintenance. The water storage tank being too small. The supply to it being compromised. The booster pump being unable to fill the riser at times of high demand. The accumulator failing as this would allow a brief break in the supply pressure when the control system switches between pumps.

 

To prevent pressure surges in boosted water supplies. Make sure that your pump set is the right size so that it will readily cope with the high demand for water.  You can control the filling operation after shut-downs or low-pressure events by setting the control system and the pumps to shut down. This includes demanding a manual reset following a power cut. Also after any period during which the output pressure is insufficient to reach the top of the building.

 

Do not hit the stop-start button to switch the pumps back on as the system will surge. It would be better to isolation manually close to the valve near the bottom of the riser. Open the Isolation Valve a little bit so that it limits the fill rate of the riser. Switch on the pump set and limit it to one pump if possible. Only open the isolation valve fully when the riser has filled and the supply pressure has stabilised to the normal level. The operation of the pump set should then be set to automatic.


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