25
KM70
ENG_DEBEM S.r.l.
Rev. 01A-EN
01/03/2021
5. Starting and stopping
5.1 Pre-start checklist
Before starting the pump, check the following:
• the shut-off valve on suction (if provided) must always be completely open
• the shut-off/regulation valve on the delivery must be set to the minimum flow rate for the
pump. If you don't know the minimum flow rate close completely the discharge valve and slowly
re-open it to 1/3.
• make sure that the fluid flows regularly to the pump
• the pump and suction piping are completely full of liquid
• for starting on new or modified plants you should use suitable temporary filter socks installed
on the suction line
in case of negative suction head, fill the suction pipe and check that the foot
valve works properly to prevent back flow of liquid thus emptying the suction
pipe with consequent disconnection of the pump
check the direction of rotation:
the motor must turn in the same direction as the arrow shown on the pump. Since all
the DEBEM S.r.l. pumps turn clockwise, make sure that the motor fan turns clockwise
too (view facing the motor fan).
check that the motor rotates freely by turning by hand:
· the motor cooling fan for close-coupled pumps
• If the liquid must be kept at a certain temperature to prevent crystallization or solidification,
heat piping in accordance with installation requirements
• make sure that any auxiliary connections are connected and working.
5.2 Frequency of starts
ATTENTION to the excessive surface temperature of the motor!
It may cause danger of explosion and damage to the motor!
In case of ATEX motor installation, observe the frequency of starts specified
in the manufacturer's manual.
