OPERATIVE INSTRUCTIONS
____________________________________________________________________
8
Trouble – Shooting
Bedu progressive cavity pumps will be operate trouble-free if they are used in accordance with
the offer and with this manual.
If operating problems arise, use this chart as a guide in locating the problem.
Trouble-shooting guide
P
u
m
p
w
il
l
n
ot
st
ar
t
N
o
su
ct
io
n
ca
pa
bi
li
ty
D
is
ch
ar
ge
ou
tp
u
t
lo
w
D
is
ch
ar
ge
pr
es
su
re
lo
w
D
is
ch
ar
ge
ou
tp
u
t
fl
u
ct
u
at
es
P
u
m
p
is
n
oi
sy
P
u
m
p
ja
m
m
ed
D
ri
ve
ov
e
rl
oa
de
d
St
at
or
an
d
R
ot
or
se
rv
ic
e
li
fe
to
o
sh
or
t
Sh
af
t
se
al
le
ak
s
Possible cause and remedies
X
x
Pump or stator is new, to much static friction.
1) Fill the pump and If possible, run the pump in one
way and in the another way till unblock the pump.
2) If necessary lubricate the rotor and the stator.
X
x
x
x
Power supply incorrect.
1) Check motor nameplate data. Test voltage, phase
and frequency.
x
x
x
Discharge pressure too high.
1) Measure actual discharge pressure and compare
to your specification.
X
x
x
Foreign matter or debris in pump.
1) Remove debris and correct any damage.
X
x
x
x
Temperature of pumped liquid too high, stator
swells.
1) Reduce liquid temperature, if liquid temperature
cannot be reduces, use an undersized rotor.
X
x
x
x
Liquid
contains
too
many
solids,
causing
blockages.
1) Check specification, increase liquid-to-solids
ratio.
X
x
x
x
Chemical attack on the stator.
1) Check specification, If necessary change the
stator with a correct one.
X
x
x
x
x
Liquid settles and hardens at pump shut-down.
1) Clean pump and rinse out after each use.
x
x
x
Air in suction piping.
1) Check connections – If necessary increase NPSH.
x
x
x
x
Suction pipe leaks.
1) Check seals and connections.
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