Electric motors 3.4
SEM-SAFE
®
High-Pressure Water Mist Pump Unit consists of 1 to 8 electric motors, each one
attached to a high-pressure pump.
Pilot pump (optional in Land and Marine applications) 3.5
The function of the pilot pump is to establish and maintain a
pilot/standby pressure in the pipe system. The pilot pump will not
activate the SEM-SAFE
®
High-Pressure Water Mist Pump Unit. The
pilot pressure is set to a maximum 14 bar and minimum 10 bar and is
monitored by the system pressure transmitter.
Unit without pilot pump (marine systems) 3.6
A SEM-SAFE
®
High-Pressure Water Mist Pump Unit without pilot pump is started by signal from a
separate Fire Detection Panel, or manually from the Valve Operation Panel (VOP), Local Call
Points or from the Unit Control Panel (UCP) by operating the pump start button. These systems are
mainly dry pipe Local Application or Total Flooding Systems.
Unit tank 3.7
The unit tank is made of stainless steel grade AISI 316, the capacity of the tank is adapted to the
discharge capacity of the SEM-SAFE
®
High-Pressure Water Mist Pump Unit. As standard, the unit
tank capacities are 820l, but for large capacity units the tank capacity is 1200l. There is also
available a version of unit tank with capacity of 300l for special applications.)
One basic function of the unit tank is to establish an air gap between the supply source (public water
supply) and the water contained in the water mist system (backflow protection according to
standard DS/EN 1717). Its other function is supplying clean filtered water to the high-pressure
pumps and receiving surplus water from the pressure relief valve. Tank and pump skid must have
earth grounding.
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