Debem KM70, Инструкция по установке, эксплуатации и обслуживанию

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KM70 ENG_DEBEM S.r.l.
Rev. 01A-EN 01/03/2021
5.4 Starting after power failure
In case of accidental stopping, make sure that the check valve has prevented backflow and check that
the motor cooling fan is stopped.
Then restart the pump following the instructions in previous section "Start-up sequence".
If the pump is installed over the machine in level, it can unprime during the
stop. Therefore, before starting, check again that the pump and the suction pi-
ping are full of liquid.
To ensure correct operation of the pump avoid:
• dry running, which could cause the rotating parts to seize
• operating with the delivery closed, which will not allow the heat generated by the pump to be
dissipated, resulting in a sudden increase in temperature until the pumped liquid boils and the
plastic parts deteriorate
• cavitation, which causes damage to the impeller
• water hammer, which can cause the internal ports and isolation shell to break
• abnormal vibrations, which can cause the screws to loosen and affect the durability of bearings
• unstable working points, which cause undue stress on the mechanical parts.
A series of accessories are available in order to ensure that the pump runs smoothly.
DEBEM S.r.l. is at your service to help you select the most appropriate accessory.
5.5 Stop sequence
A) gradually close the delivery regulation/shut-off valve until reaching the minimum flow rate
B) stop the motor making sure that the motor deceleration is steady
C) close all the other valves: if a suction shut-off valve is present, you should close it completely
The reverse sequence is not recommended, especially with larger pumps or
with longer delivery piping, in order to prevent possible problems due to water
hammer.