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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.
MP2500
Cause
Valve clogged.
Worn valve seat.
Flow meter incorrect.
Leakage from relief valve.
Air leaking into suction
piping
Air lock in suction line.
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
Updated January 2017
Corrections
Clean.
Replace seat or valve.
Inspect meter, repair or
change.
Inspect, repair or change.
Check for leak source and
repair.
Review suction pipework
layout to eradicate air
pockets.
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.
Page 11
Series 2500
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