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Horizontal End Suction Pump for Chemical Process, ASME B73.1-2001
Installation, Operation, and Maintenance Manual – CPP21
CAPACITY OR
DISCHARGE
PRESSURE LOW
a. Air leaks into suction
b. Speed too low
c. Clogged suction
d. Clogged impeller
e. Damaged impeller
f. Wrong rotation
g. Pump or piping are not
properly vented
h. Feed pipe or impeller
plugged
i. Formation of air pockets
in the piping
j. Inner pump parts are
worn
k. Density or viscosity of
pumped fluid is not same as
designed.
l. The motor voltage is
incorrect
m. Motor connected only in
two-phase mode
n. NPSHa too low
a. Check suction line for leaks.
b. Check driver and its power source
c. Clean out suction line.
d. Clean impeller
e. Replace impeller.
f. Check driver rotation.
g. Vent or top up.
h. Clean pipe and impeller.
i. Install vent valve or lay piping elsewhere.
j. Change worn parts
k. Consult a Ruhrpumpen dealer.
l. Apply correct voltage to the motor
m. Check the cables, connections and fuses
n. Check the fluid level in the feed container.
Open suction valve completely.
Lay suction pipe elsewhere is friction losses are too big.
Check for a possible filter in the feed pipe.
DRIVER
OVERLOAD
a. Density or viscosity of
pumped fluid is not same as
designed.
b. Speed too high
c. Pump unit is not properly
aligned
d. Pump is under tension
e. The motor voltage is
incorrect
f. Motor connected only in
two-phase mode
g. Bearings are damaged
h. System head lower than
rating
a. Consult a Ruhrpumpen dealer.
b. Decrease driver speed.
c. Realign the pump
d. Check the piping for tension free connections
e. Apply correct voltage to the motor
f. Check the cables, connections and fuses
g. Change damaged bearings.
h. Check suction and discharge pressure.
Set operating point with the discharge valve
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