residential fire sprinkler system design maiximum pressures

The size of the tank is designed by the hydraulic calculations of the system using the number heads determined by the category. From here we attach a self-testing pump to ensure that the required water can be supplied to all the sprinkler heads. If the town water main does not meet the criteria cannot then your sprinkler system will need to be fed from a stored water supply. However, an additional 25 litres per minute will be required on top of the design duty. This will divert water to the fire sprinkler system upon activation. *If a dedicated supply cannot be provided then a priority demand (solenoid) valve can be fitted.

Ultrasafe offer servicing, testing, maintenance and servicing on all our fire sprinkler systems for more information please go to our page on Servicing and Maintenance of Fire Sprinklers. Pump and Tank Fire Sprinklers – this system is fed from water stored in a tank and pumped to the sprinklers. If the town water mains supply in your building can not meet these criteria and a new supply is not an option then a stored water supply should be used.

The water flow rate varies between litres per minute (Cat 1, 1 head) and 240 litres per minute (Cat 3, 4 heads).

Water pressure and flow must be determined by the design and hydraulic calculation, typically between 2.5 and 4 bar.

The water main must be unmetered – this is a requirement of the British Standard.

There must be a dedicated* 32-50mm (cat 1), 50mm (cat 2), 50-63mm (cat 3) incoming water main into the property.

To feed a fire sprinkler system the water main must satisfy the following criteria: However a town water main fire sprinkler system is reliant on the consistency of water pressure provided by your local utility company. As such there is no need to store the water in a tank or pump the water around the system. As the name suggests this is a fire sprinkler system fed directly by the town water main.

Residential fire sprinkler system design maiximum pressures