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The fire pump set can only be stopped manually under automatic
operation mode via a dedicated key removable from the control
panel. Due to the regulation for fire and the active protection of the
pumping system, it is required not to have any emergency stop.
Clearly indicate which location in the technical room the
key is stored.
Each time when the personnel enters the technical room,
or before any inspection, maintenance, service or repair of
the product, make sure that the key is available on site.
Check periodically the proper tightening of hydraulic
connections and the integrity of all the components.
2. Product introduction
2.1 Product description
The Hydro EN pump sets for automatic sprinkler systems are in
compliance with the requirements of EN 12845 - Fixed firefighting
systems - Automatic sprinkler systems - Design, installation and
maintenance.
The Hydro EN pump sets are designed for automatic sprinkler
systems such as single, superior single, duplicate or combined
water supply sources.
The pumps are of the back pull-out design, enabling removal of the
motor, coupling, bearing bracket and impeller without disturbing the
pump housing or pipes.
All pump sets are supplied as factory-tested units. In addition, the
diesel pumps are supplied with a factory test report as required by
the EN 12845 standard.
The range consists of the following types:
•
S version: One or two duty pumps operated by an electric motor.
•
Y version: Two duty pumps. One pump is operated by an
electric motor and the other pump is operated by a diesel
engine.
•
T version: One or two duty pumps operated by a diesel engine.
Duty pumps
Each duty pump, built on a robust baseplate, is able to deliver
100% of the required flow rate.
In case of a two-pump system, the second pump is an active
backup in case the first is not effective.
The system with three duty pumps is also available upon request,
each delivering 50% of the required flow rate (two pumps in
operation simultaneously deliver the required performance).
In case of catching fire, the network pressure drops, the pump set
starts automatically. The pump set continues to run until someone
stops it manually. If necessary and permitted by local regulation,
you can activate the "automatic stop function" (always included but
factory-disabled) that automatically shut down the running duty
pump through an adjustable timer.
The shape of the QH curve is stable.
Motors or engines are sized according to EN12845 prescriptions.
The diesel pump is cooled in one of the following solutions
according to the power size:
•
with direct air
•
with water/water heat exchanger.
The fuel tank is sized to ensure at least 6 hours of continuous
operation and is equipped with a containment basin and vent
connection.
An industrial silencer is supplied as standard for diesel pump sets.
6
Jockey pump
A jockey electric pump (always included), operated by a dedicated
control panel, automatically guarantees system pressurization in
case of small leaks, in order to prevent unjustified start-up of the
main pumps.
The jockey pump is equipped with a 24-litre tank.
Control unit and other components
The hydraulic components are selected and sized in order to
minimize the pressure losses and the water speed in compliance
with the requirements in the EN 12845 standard, at any flow rate
value stated on the performance curve.
The systems described above include the following:
•
an independent control panel for each duty pump with operating
and control buttons
•
two pressure switches for each duty pump which are
hydraulically connected to each other with a manifold of 15 mm
in diameter
•
a pressure switch on each duty pump to detect the actual
pressure supplied
•
connection for the priming circuit and connection for the
recirculation circuit to prevent overheating of the pump when
running against closed valves.
The pump sets are equipped with the necessary instrumentation to
simplify these operations during tests and commissioning.
Scope of supply and accessories
All pump sets are supplied as factory-tested. In addition, the diesel
pumps are supplied with a factory test report as required by the EN
12845 standard.
The scope of supply can be completed with the following
accessories:
•
a suction kit dedicated for installation in suction-lift or in positive
head conditions, including:
- an eccentric divergent pipe with a controlled taper,
- a vacuum pressure gauge, and
- an isolating valve (not included in the version for installation
in suction-lift conditions).
All accessories are sized according to the prescriptions of the
standard.
•
a testing kit including a flowmeter, valves and straight pipe
sections to get the optimum flow rate reading.
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