39
of
46
Subject to change without prior notice
INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS
FIRE PUMPS - NF-VTP SERIES
Ref. No. NFVTP-IOM/
2016
/V.
02
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
? ?
Pumping higher viscosity or
specific gravity liquid than
designed for.
Test liquid for viscosity and specific
gravity and re-evaluate the system.
?
?
Misalignment.
Realign pump and driver.
?
Motor or gear drive hollow
shaft end play maladjustment.
Adjust the end play as given in the
driver IOM manual.
?
Foreign object lodged
between impeller and bowl.
Remove object as required.
?
?
Packing is too tight.
Release gland pressure. Retighten.
Keep the leak flowing. If no leak
then check packing, sleeve or shaft.
?
Defective packing.
Replace worn packing.
? ? ?
Wrongly installed packing
Replace / re-pack the packing not
properly installed.
? ?
Insufficient or no lubrication
for packing.
Release gland pressure and replace
all packing if burnt or damaged.
Re-grease packing as required.
? ? ?
Wrong grade of packing.
Replace improper packing with
correct grade as recommended by
factory.
? ?
Resonance.
Check piping strain and alter
resonant piping. Stiffen or weaken
the pump or structure.
