Operating instructions

Breakdown,
Reasons,
Remedies
Ausgabe
issue
A / 05.01.1995
Dokument
document
OM.REC.01e
Blatt
sheet
1 (1)
Breakdown
pump has no suction pump conveys irregularly the conveying capacity is not achieved pressure is not achieved pump does not start pump has seized or has stopped conveying pump operates noisily motor becomes too warm the stator wears out early shaft sealing leaks
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.
24