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WILO SE 01/2018

• Water/water heat exchanger for diesel engine

cooling;

• Flow meter;
• Diesel engine spare parts kit;
• Remote alarm switchgear;

The installer is responsible for the assembly of the
equipment supplied and for completion of the
system in compliance with the requirements of
EN 12845 and others applicable standards for fire
fighting systems as well as for integration of our
supply with all other necessary components (cir-
culation piping, flow rate metering circuits with
meter, priming tank, etc).
See the specific instructions provided in the rele-
vant instruction manuals and/or the indications
provided on the items themselves for details of
how to assemble, set and adjust the accessories
listed above or other particular accessories
requested at the order stage and supplied with the
standard pumping unit.
The installer is responsible for issuing the final certi-
fication “installation built in compliance with
EN 12845 standard”, as required by the relevant
standards, and for issuing the end-user with all the
documents foreseen by the applicable standard.

6 Description and function

6.1 General description

There are several variants and models of the fire
fighting unit of the SiFire series as indicated in our
catalogues, or in versions modified in order to sat-
isfy particular customer requirements (transport/
handling difficulties, particular performances,
etc), using the main components described below:

• Main norm pump in “back pull out” design, cou-

pled to an electrical motor or diesel engine by a
spacer allowing the dismantling of the pump and/
or motor without having to work on the other. It
also allows the extraction of the rotating part of
the pump for maintenance without having to
remove the motor and/or the end suction pump
housing;

• Vertical multistage jockey pump for correcting

small losses and for keeping the system pressure
constant;

• Electrical switchgears for the main and jockey

pumps (one per pump);

• Piping and discharge manifolds in steel;
• Valves on the pump discharge that can be locked

in the open position;

• Non-return valves on the pump discharge;
• Butterfly valves, manometers, pressure switches;
• Connection for flow meter to control the perfor-

mance of the pumps;

• Double pressure switch for the circuit to start the

main pumps and control of the working order of
each individual pressure switch;

• Pressure switch for automatic start-up and stop

of the jockey pump;

• Support frame(s) for switchgears and manifolds;

• Independent fuel tank for the diesel engine, com-

pleted with accessories;

• Two batteries for the start-up of the diesel engine

(if present);

The system is assembled on a base frame in
accordance with the EN 12845 standard, within
the delivery limits, indicated on installation dia-
gram from Fig. 2a-2b.
Each pump is installed on a steel base frame. Die-
sel pumps are connected to hydraulic elements
with intermediary vibration damping joints to
avoid the transmission of vibrations from diesel
motors but also the possible piping or mechanical
structure breaks.
For connection to the public water distribution,
rules and existing standards must be respected
and possibly completed with rules of water distri-
bution companies. Besides, local particularities
have to be taken into account, for example a too
high or too variable suction pressure which
requests the assembly of a pressure reducing
valve.

6.2 Description of the product

6.2.1 Pressure boosting system

see Fig. 3 – Position:

1 Gate valve
2 Connection for local sprinkler
3 Double pressure switch for the circuit of the

main pump

4 Non-return valve
5 Flexible vibration-damping sleeves for diesel

pump

6 Connection for recirculation circuit with dia-

phragm

7 Divergent cone on discharge side main pump
8 Pump/motor coupling with spacer
9 Main pump electric/diesel motor

10 Coupling guard
11 Main pump switchgear
12 Jockey pump switchgear
13 Discharge manifold
14 Connection for setting of flow meter option
15 Fuel tank (for diesel pump)
16 Connection for priming circuit of main pump
17 Main pump
18 Jockey pump
19 Tank for fuel leakages
20 Fuel tank vent valve
21 Fuel level gauge
22 Drain for cleaning of deposit in fuel tank
23 Drain for cleaning of deposit in tank for fuel

leakage

24 Fuel filler cap
25 Connection for motor return pipe
26 Connection for fuel supply to the motor
27 Level gauge for fuel

om_sifire_easy__4206362_ed02__1801_de_en_fr.book Seite 44 Freitag, 2. Februar 2018 10:23 10