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Trouble
(D)
Reduced pump flow
rate or unstable rate.
(E)
Reduced pump flow
rate.
Unstable flow rate.
Flow rate does not
increase as stroke
length is increased.
Cavitation noise may
be apparent.
MP3000PR 001 to 010 Plunger PumpUpdated January 2017
Cause
Micrometer out of
adjustment
Valve clogged.
Worn valve seat.
Flow meter incorrect.
Leakage from relief valve.
Air leaking into suction
piping
Change in pump RPM.
Insufficient NPSH
available:
(a)
Suction pipe
diameter too small.
(b)
Suction lift too great.
Viscosity of liquid too
high.
Vapour pressure high.
Suction piping and/or
valve clogged
Suction strainer clogged
or too small
Corrections
Re Zero.
Clean.
Replace seat or valve.
Inspect meter, repair or
change.
Inspect, repair or change.
Check for leak source and
repair.
Correct electric power
sources, speed control etc.
Enlarge suction pipe, or
install accumulator in the
line close to pump or raise
level of tank.
Raise liquid level.
1. Heat or lower viscosity
by other means.
2. Increase suction pipe
diameter.
3. Increase suction
pressure.
1. Lower liquid
temperature at inlet
port.
2. Raise liquid level.
Clean
Clean or replace with larger
unit.
Series 3000PR
Page 10
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