8 Trouble-shooting
64 of 72
HPK
A B C D E F G H Possible cause
Remedy
14)
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- Density or viscosity of fluid handled
higher than stated in purchase order
Contact KSB.
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- Gland follower over-tightened or cocked Correct.
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- Speed is too high.
Reduce speed.
15)
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- Defective gasket
Fit new gasket between volute casing and
casing cover.
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- Worn shaft seal
Fit new shaft seal.
Check flushing liquid/barrier fluid.
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- Score marks or roughness on shaft
protecting sleeve / shaft sleeve
Replace shaft protecting sleeve/shaft sleeve.
Fit new shaft seal.
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- Vibrations during pump operation
Correct suction conditions.
Re-align the pump.
Re-balance the impeller.
Increase pressure at the pump suction nozzle.
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- The pump set is misaligned.
Re-align.
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- Pump is warped or sympathetic
vibrations in the piping.
Check the piping connections and secure
fixing of pump; if required, reduce distances
between the pipe clamps.
Fix the pipelines using anti-vibration material.
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- Insufficient or excessive quantity of
lubricant or unsuitable lubricant.
Top up, reduce or change lubricant.
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- Non-compliance with specified coupling
distance
Correct the distance according to general
arrangement drawing.
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- Motor is running on two phases only.
Replace the defective fuse.
Check the electric cable connections.
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- Rotor out of balance
Clean the impeller.
Re-balance the impeller.
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- Defective bearing(s)
Replace.
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Flow rate is too low.
Increase the minimum flow rate.
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- Incorrect inflow of circulation liquid
Increase the free cross-section.