TapFlo CTM20-7 Manual - 3. Maintenance
3. MAINTENANCE
IOM manual CTM mag drive pumps
14
3.2.
Location of faults
Le
ak
ag
e
for
m
th
e
pu
m
p
Ins
uf
fi
ci
ent
f
lo
w
ra
te
o
r
pre
ss
ur
e i
n
pum
p
No
pr
es
su
re
o
n
th
e
di
sch
ar
ge
sid
e
Ir
re
gu
la
r
di
sch
ar
ge
f
low
/
pr
es
su
re
Nois
e
an
d
vi
br
atio
ns
Th
e
pu
m
p
ge
ts
clo
gg
ed
O
ve
rh
eatin
g
of
th
e
pu
m
p
Ab
nor
m
al
w
ear
Bu
sh
in
g
lif
e
too
s
ho
rt
Possible reason
Solution
X X X
Wrong direction of rotation
Invert the direction of rotation
X X X X
Insufficient suction head (NPSH)
Increase available NPSH:
➢
Raise the suction reservoir
➢
Lower the pump
➢
Reduce the vapour pressure
➢
Increase the diameter of the suction pipe
➢
Make suction pipe short and direct
X
Pump is clogged
Clean the pump
X X X X X
Cavitation
Increase suction pressure
X X X X
The pump sucks air
Make sure all connections are tight
X X X
Suction pipe is blocked
Check pipes / valves and filters on the suction
line
X X
Discharge pressure too high
Reduce the head by increasing pipe diameter
and/or reduce number of valves and bends
X X
Flow rate too high
Reduce the flow:
➢
Partially close the discharge valve
➢
Reduce the impeller diameter (contact us)
➢
Reduce the rotation speed
X X X X X X
Liquid temperature too high
Cool the liquid
X
X
Pump runs dry
Always fill pump before start-up
X
Wrong material of bushings for the liquid
Mount bushings in other material (contact us)
X X
Loads on the pipes
Connect the pipes independent of the pump
X X X X
Foreign objects in the liquid
Use a filter on the suction side
X
Shut-off valve closed on suction side
Check and open the valve
X
Discharge pressure too low
Increase the pressure – install an impeller with
a bigger diameter (contact us)
X X
Pump is not filled with liquid
Fill pump with liquid
X X
Liquid parameters different than calculated Check pumped liquid parameters
X X
Magnetic coupling damaged or insufficient Check and replace magnet assemblies
X
Rotating unit out of balance
Check and replace magnet assemblies
X X
Inner bushes worn or damaged
Check bushing and replace if necessary