Water consumption of Fire Sprinkler Systems

Recently, one of our engineers found a simple way assist a new customer conserve millions of liters of fresh water used in the weekly testing of a fire sprinkler system. Here is an extract of his email to the customer.

From: Paul
Sent: Friday, 2 March 2007 1:33 PM
Subject: Building water consumption during sprinkler testing - Recalibration of pressure switches

I was onsite recently when we noticed that size of the pressure reduction valve (100mm) connected to the discharge line of both the main Diesel and Electric pump.

My immediate thought was why the need for such a large pressure reduction valve and the fact it was connected to the waste water drain.

Further investigations of this pressure reduction valve indicate that there is a discharge a minimum of 2500 litres per minute to as much as 4000 litres per minute into the drain from the fire sprinkler system each time we test. This testing is carried out weekly.

If the main boosting pump is ran for say 25min (as is the case), we have the potential to discharge as much as 62,500 litres to 100,000 litres per week into the waste water drain.

Note: The average Australian domestic swimming pool contains between 35,000 and 40,000 liters of water.

If a service technician performs 52 weekly weekly sprinkler tests per year then the building owner has consumed over 3 million liters of FRESH DRINKING water...

Note: "An Olympic Pool must be 25 m wide with a depth of 2.0 m (min) at all parts of the course and must be 50 m in length. Which equates to 2,500,000 liters of water.

The solution

Our engineers solution was to recalibrate the pressure switch settings of both the multi stage electric, diesel and jacking pumps and ensure the operational integrity of the system was maintained.

The 8 hour investment was made by the customer shortly after the email was sent and the system was modified as agreed.

The result was a more efficient testing procedure with much less water consumption.

More Information

Please contact our if you would like to learn more about our water saving initiatives, and how they might benefit your organisation.

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