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Subject to change without prior notice
INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS
VERTICAL TURBINE PUMP - NVT SERIES
Ref. No. NVT-IOM/2020/V.01
Pum
p doesn’t start.
Pum
p runs w
itho
ut discharge.
Flo
w ra
te is insuff
icient.
Insuff
icient discharge pressure.
Pum
p ceases after running for a whil
e.
Pum
p requires ex
cessi
ve po
w
er
.
A
bn
ormal n
oise l
ev
el.
Ex
cessi
ve v
ibra
tions
Ex
cessi
ve l
eak a
t stuff
ing bo
x.
Stuff
ing bo
x is o
verhea
ting
Packing w
ears o
ut too fast.
Fault
Remedy
?
Break suction.
Check dynamic water level in the
well. Lower bowl assembly by
adding column.
? ? ?
Static lift too high.
Consult factory for adding stages
or increase impeller diameter.
? ? ?
Field head requirement
greater than design head.
Check system friction loss, increase
discharge piping size. Consult
factory for adding stages or
increase impeller diameter.
?
Damaged bowl assembly;
broken or disconnected shaft.
Pull pump and repair all damaged
components.
? ?
Excessive pump wear.
Pull pump and repair as required.
? ?
?
Damaged impeller.
Inspect, replace if damaged.
? ?
Bent shaft.
Straighten as required.
?
Rotating parts binding loose
or broken.
Replace as required.
? ? ? ?
Bearings are worn out /
damaged / defective.
Replace bearings.
?
Shaft or shaft sleeve worn.
Pull pump and re-machine, or
replace shaft and/or sleeve.
? ?
Air or gas in the water.
If successive start and stop does not
remedy, lower pump if possible, or
close discharge valve to maintain
well pumping level at a lower gpm.
