Periodic Maintenance; Regulating The Set - DAB 1S4 Instructions Pour L'installation Et La Maintenance

3.3. SETS WITH SEVERAL PUMPS
Standard EN 12845 – UNI 10779 contemplates various solutions with one or more pumps having similar characteristics:
if TWO pumps are installed, each pump supplies the total flow rate of the system (100%),
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if THREE pumps are installed, each pump supplies 50% of the total flow rate.
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DAB supplies the sets in a "modular" version, in separate units, so as to be able to make up all the versions mentioned above. By means of the
JOINING MANIFOLD it is possible to join the manifolds so as to obtain a single delivery manifold.
The electrical panels remain separate as required by EN 12845 - UNI 10779.

4. PERIODIC MAINTENANCE

The whole fire-fighting system to standard EN 12845 – UNI 10779, including the set of fire-fighting pumps, must always be kept in perfect
working order. For this reason, regular maintenance is of particular importance.
According to standard EN 12845 point 20.1.1 – UNI 10779, the user must:
- carry out a programme of inspections and checks;
- arrange a testing, assistance and maintenance programme,
- document and record the activities, filing the documents in a special register kept in the building.
The user must ensure that the testing, assistance and maintenance programme is carried out under contract by the installer of the system or by
a company with the same qualifications.
4.1. WEEKLY CHECK (to be carried out at intervals of no more than 7 days)
The weekly check of the fire-fighting set to standard EN 12845 – UNI 10779 contemplates checking and noting down the following values:
pressure of pressure gauges,
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water level in the tanks – water reserves,
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correct position of the interception valves.
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To test the automatic starting of the pumps, proceed as described below:
Open the pump manual start valve (ref. 5).
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Check that the pump starts and make a note of the starting pressure.
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Close the manual start valve.
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4.2. QUARTERLY CHECK (at intervals of no more than 13 weeks – see EN 12845 point 20.3.2 – UNI 10779)
Check for any changes in the system, changed class of risk, etc.
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Check sprinklers, pipes, pipe supports (see EN 12845 point 20.3.3.2 – UNI 10779).
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Start the pumps and check the pressure and the flow rate.
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Check the operation of any generators – generating sets.
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Check the correct position of the interception valves.
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Check the correct operation of the secondary electric power supply coming from Diesel generators.
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4.3. HALF-YEARLY CHECK (at intervals of no more than 6 months – see EN 12845 point 20.3.3 – UNI 10779)
Check the dry alarm valves (in the system).
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Check the operation of the alarms in the control room and/or at the Fire Station.
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4.4. YEARLY CHECK (at intervals of no more than 12 months – see EN 12845 point 20.3.4 – UNI 10779)
Check the pressure and the flow rate of the pumps against the values given on the technical data plate.
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4.5. THREE-YEARLY CHECK
Check for corrosion outside and INSIDE the tanks, repairing the protection if necessary.
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Check the interception and check valves, replace them if necessary.
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4.6. TEN-YEARLY CHECK
After no more than 10 years, clean all the tanks and check the internal structure.

5. REGULATING THE SET

5.1. CALIBRATION OF THE PRESSURE SWITCHES
Standard EN 12845 – UNI 10779 contemplates two pressure switches for each pump, each pressure switch with normally closed contacts
connected in series.
Opening any one of the two pressure switches causes the pump to start.
For pressure switch settings different from those carried out in the factory, proceed in accordance with the following instructions during
handover testing of the pumping set:
the type of pressure switch installed in the pump set,
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the pressure limits indicated on the data plates of each pump,
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the limit indicated by standard EN 12845 – UNI 10779 according to which the two pressure switches must be calibrated in such a way as to
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start the pump at a value pump pressure with delivery closed x 0.8.
In the case of sets with two pumps, the second pump will be started at a value pump pressure with delivery closed x 0.6.
ENGLISH
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