Breakdown,
Reasons,
Remedies
Ausgabe
issue
B / 02.01.2006
Dokument
document
OM.REC.01e
Blatt
sheet
1 (1)
Breakdown
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seepex progressive cavity pumps will operate trouble-free if they are
used in accordance with our data sheet (see item 9) and our
operating and maintenance instructions:
1
2
3
4
5
6
7
8
9
10
Reasons / Remedies
X
X
a
Adhesion between rotor and stator excessive (as delivered). Lubricate
(soft soap, genuine soap) between stator and rotor.
Then turn the pump by means of the tool W2 .
X
b
Check rotational direction of the pump per data sheet and nameplate. In
case of wrong direction, change wiring of motor.
X X
X
X
X
c
Suction pipe or shaft sealing leak. Eliminate the leakage.
X X
X
X
d
Suction head too high (item 6.5.3.1). Check suction head with vacuum
gauge. Increase the suction pipe diameter and fit larger filters. Open the
suction valve fully.
X X
X
e
Viscosity of the liquid too high.
Check and accommodate per data sheet.
X
X
X
f
Wrong pump speed. Correct pump speed per data sheet.
X
X
g
Avoid inclusions of air in the conveying liquid.
X
X
X
X
X
h
Pressure head too high (point 6.5.3.2). Check pressure head with
manometer. Reduce the pressure head by increasing the pressure pipe
diameter or by shortening the pressure pipe.
X X
X
X
X
i
Pump runs partially or completely dry (point 6.5.2). Check flow in the
suction chamber. Install dry running protection TSE.
X
X
j
Check coupling, possibly pump shaft is misaligned to drive. Check
whether coupling gear is worn. Realign coupling. The coupling gear has
perhaps to be replaced.
X
X
k
Speed too low. Increase the speed when high suction performances are
required and when the liquid is very thin.
X X
X
l
Speed too high. Reduce the speed when pumping products with high
viscosities - danger of cavitation.
X
m
Check the axial play in the coupling rod linkage. Check that the bush
has been installed correctly see document OM.PJT.__.
X
X
X
X
X
n
Check for foreign substances in the pump. Dismantle the pump, remove
foreign substances and replace worn parts.
X
X
X
X
o
Stator or rotor worn. Dismantle the pump and replace defective parts.
X
X
X
X
p
Joint parts worn. Replace worn parts and fill with special pin joint grease
.
X
X
X
X
q
Suction pipework partially or completely blocked. Clean suction
pipework.
X
X
X
X
X
r
Temperature of the pumping liquid too high. Excessive expansion of the
stator. Check temperature and install rotor with diameter smaller than
specified.
X
X
X
X
X
s
Gland packing too strongly tightened or worn. Ease or tighten stuffing
box. Replace defective packing rings.
X
X
X
X
t
Solid contents and/or size of solids too large. Reduce pump speed and
install perhaps a screen with suitable meshes. Increase fluid share.
X
X
X
X
u
When the pump is non operational the solids settle out and become
hard. Clear and flush the pump immediately.
X
X
X
X
X
v
The liquid becomes hard when temperature falls below a certain limit.
Heat the pump.
X
X
X
X
w
Stator swollen and unsuitable for the pumped liquid. Select a suitable
stator material. Use perhaps rotor with diameter smaller than specified.
X
X
x
The bearing in the drive casing of the pump or in the drive engine is
defective. Replace bearing.
X
y
Mechanical seal defective. Check seal faces and O-rings. If necessary
replace corresponding defective parts.
Page 23
Summary of Contents for BN 5-12 Series
Page 13: ...TAB 1 DEVICE DATA SHEETS ...
Page 18: ...TAB 2 APPROVED SUBMITTAL ...
Page 23: ...All data subject to change without notice 1 800 ASK 4WEG www weg net 14 ...
Page 26: ...Your advantages our pumps ...
Page 45: ...ADV 2 13E And what can we get flowing for you Your nearest contact Or visit www seepex com ...
Page 117: ...TAB 3 INSTALLATION OPERATIONS AND MAINTENANCE ...
Page 133: ...Page 37 ...
Page 233: ...www weg net Manual of Electric Motors 64 ENGLISH Figure 2 1 IEC motor nameplate Page 135 ...
Page 234: ...www weg net Manual of Electric Motors 65 ENGLISH Figure 2 2 NEMA motor nameplate Page 136 ...
Page 306: ...TAB 4 AS BUILTS AND SUPPLEMENTAL INFORMATION ...
Page 307: ...R Page 29 ...
Page 308: ...R Page 30 ...