User manual Pomac PLP Lobe pump
24 CE/PLP (1406) EN-12
5. Operation
5.1. Checking
⚫ Check if the gearbox is sufficiently filled with oil. The oil level must be visible through the oil
sight glass of the gearbox.
! The pump may never operate if the gearbox is not filled with oil!
⚫ If present, check the pressure of the flushing system.
For shaft seals types M2, M5, O2 or O4 the (pressure-less) quench must have a pressure of
0,5 mwc and a flow of 0,25 l/min. In case the pump is vertically mounted the QUENCH
SUPPLY LINE SHOULD BE CONNECTED TO THE LOWER SIDE!
For shaft seals M2 or M5 the (pressurized) flush must have a pressure of 2 bar higher than
system pressure.
In case the pump is vertically mounted the FLUSH SUPPLY LINE SHOULD BE
CONNECTED TO THE LOWER SIDE!
⚫ If present, check if the heating system has the correct temperature.
5.2. Start Up
1. If present, open the stop valves of the flush lines.
2. If present, open the stop valves of the heating system. Let the pump warm up to its
working temperature.
3. If present, open the discharge valve.
4. If present, open the suction valve.
5. Start the pump-unit.
5.3. Adjusting the safety valve
! If the pump is provided with a safety valve, the required opening pressure of this valve
must be set first BEFORE commissioning the pump!
5.3.1. Adjusting a spring loaded safety valve
1. Ensure the shut-off valves in the pressure line, and possibly in the suction line, are
completely opened. The system must be filled with the liquid to be pumped.
2. Ensure the spring of the safety valve is completely unloaded. If not, unscrew the locknut
and turn the setscrew completely clockwise (see figure) until the spring is completely
unloaded.
3. Switch on the pump.
4. Turn the setscrew of the safety valve completely anti-clockwise until the spring is maximally
loaded.
! On doing this, check if the pressure does not exceed 15 bar!
If it does exceed 15 bar, immediately shut down the pump and check the system piping!
5. Slowly close the shut-off valve at pressure side until the pressure gauge indicates the
desired opening pressure of the safety valve.
! The opening pressure may never be set higher than 15 bar!
6. Turn the setscrew of the safety valve clockwise until the pressure gauge indicates the
pressure starts decreasing. The valve is now set to the correct pressure.
7. Set the pressure shut-off valve to the normal opened position.
8. Fix the setscrew of the safety valve by tightening the locknut.
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