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Horizontal End Suction Pump for Chemical Process, ASME B73.1-2001
Installation, Operation, and Maintenance Manual – CPP21
SECTION ELEVEN - TROUBLESHOOTING CHART
TROUBLE PROBABLE CAUSES SUGGESTED SOLUTION
HOT BEARINGS
a. Insufficient Oil
b. Contaminated Oil
c. Misalignment
d. Too much oil
e. Pump is under tension
stress
f. Excessive axial thrust
g. The given half-coupling
spacing is not set
h. Bearings are damaged
a. Add Oil.
b. Drain and clean reservoir. Refill with clean oil.
c. Check alignment of pump and driver.
d. Drain to proper level.
e. Check the piping for tension free connections
f. Clean balance holes in the impeller and change the seal
rings.
g. Reset and give the correct spacing.
h. Change damaged bearings.
LEAKAGE
UNDER SHAFT
SLEEVE
b. Pump unit is not properly
aligned
c. The given half-coupling
spacing is not set
b. Realign the pump
c. Reset and give the correct spacing.
PUMP DOES
NOT DELIVER
LIQUID
a. Inner pump parts are
worn
b. Density or viscosity of
pumped fluid is not same as
designed.
c. The motor voltage is
incorrect
d. Motor runs only in two
phase mode
e. Pump not primed
f. Speed too low
g. Feed pipe or impeller
plugged
h. Clogged suction
i. Damaged impeller
j. Wrong rotation
k. Pump or piping are not
properly vented
l. Formation of air pockets
in the piping
m. The counter pressure of
the system is greater than
the design point of the
pump
n. NPSHa too low
a. Change worn parts
b. Consult a Ruhrpumpen dealer.
c. Apply correct voltage to the motor
d. Check the cables, connections and fuses
e. Prime pump.
f. Check driver input.
g. Clean pipe and impeller.
h. Clean out suction line.
i. Replace impeller.
j. Check driver rotation.
k. Vent or top up.
l. Install vent valve or lay piping elsewhere.
m. Open discharge valve as wide as necessary to reach the
operating point.
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.
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