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WATER SUPPLY NETWORK FOR FIRE-FIGHTING SYSTEMS<br />
Closed loop type water supply to fire-fighting systems is advisable (which ensures two supply lines).<br />
If the closed loop type is not practicable, the open loop type can be adopted (one supply line only).<br />
Fire-fighting systems with fire hoses / hydrants<br />
UNI 9490 is the reference standard concerning supply pump sets, while UNI 10 779 is the reference standard for the<br />
system.<br />
In particular, UNI 10 779 allows the pumps to stop AUTOMATICALLY 20 minutes after the pressure has been restored<br />
(after the start pressure switch contacts have opened).<br />
Automatic sprinkler type fire-fighting systems<br />
UNI 9490 is the reference standard concerning supply pump sets, while UNI 10 779 is the reference standard for the<br />
system.<br />
To calculate the number of fire hoses/hydrants/sprinkler heads required, the system designer must refer to the current<br />
standards. System design and technical data for the pump set (flow rate - head – pump type etc.) must be determined<br />
by the designer.<br />
FIRE-FIGHTING<br />
GRUPPO<br />
ANTINCENDIO<br />
SYSTEM<br />
FIRE-FIGHTING<br />
GRUPPO<br />
ANTINCENDIO<br />
SYSTEM<br />
Closed loop type<br />
Ensures 2 water supply lines.<br />
Recommended.<br />
Open loop type<br />
Used whenever the closed loop type is not practicable.<br />
OPERATING TEST<br />
Systems must be inspected at least twice a year<br />
(UNI 8.1.1 - 8.12.).<br />
As well as an overall inspection of the whole system, automatic and manual starting / restarting tests are performed on<br />
the pumps.<br />
Flow rate and head tests are also performed by means of flow meters and pressure gauges fitted to the set.<br />
To check the UNI pump units, the DAB units are also available in a version featuring an automatic weekly testing<br />
system.<br />
An electrovalve located on the delivery manifold opens and lowers pressure.<br />
A PLC processes the signals of the starting pressure switches and starts / stops the pumps for a set time of about 2<br />
minutes.<br />
The weekly testing function periodically starts and stops the main pumps (*) in order to check they are in good working<br />
order and reports any faults with an acoustic-luminous alarm.<br />
(*) It stays off during weekly testing.<br />
112<br />
®
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