Troubleshooting - Victor Pumps R-Serie Betriebs- Und Wartungsanleitung

R
3. STARTING
3.1 Before starting for the first time, pour a little of
the liquid to be pumped into the casing to help
self-priming. Check by hand that the pump can
rotate freely.
3.2 Check that all the valves in the suction and
delivery lines are open.
Figure 1 - Direction of rotation
3.3 Start the motor and check the direction of
rotation. Looking from the shaft end if the right
hand port is chosen as the suction port, the
pump shaft must rotate clockwise.
: If the pump is fitted with a by-pass
A
TTENTION
relief valve, the cover with the adjusting screw
must be on the suction port side.
If the direction of pump rotation is to be
reversed, the by-pass must also be inverted or a
double by-pass must be mounted.
3.4 Engine-driven pumps are generally fitted with
industrial clutches. Start the engine with the
clutch disengaged and bring gradually up to
near running speed. Carefully engage the clutch
and accelerate the engine until the required
speed is reached.
4. SHAFT SEAL
4.1 Packing Seal. If leakage along the shaft is
excessive, gradually tighten the gland nuts.
: Do not overtight the gland nuts.
A
TTENTION
During operation, liquid must leak through the
packing for lubrication and cooling. If this loss of
liquid is dangerous due to corrosion or fire
hazard, a mechanical seal must be fitted.
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Operating Instructions
»R« Pumps
4.2 Mechanical shaft seal with external quench
liquid. Before starting pour the quench liquid into
the reservoir. This liquid must be compatible
with the liquid to be pumped. The shaft seal
gaskets are all made of PTFE unless otherwise
specified.
5. TROUBLE SHOOTING
5.1 PUMP DOES NOT PRIME
a) Wrong direction of rotation (see section
3.3).
b) No liquid in pump casing to create a seal
(see section 3.1). The vacuum gauge needle
hardly moves.
Should the pump self-prime at every start and
has difficulty in priming it is recommended to fit
either a goose neck (curve upwards and reverse
curve) or a foot valve in the suction line to
ensure that there be always liquid in the pump.
c) Closed valve in the suction line, suction
line or filter clogged. Vacuum gauge reading is
high. Check the suction line thoroughly.
d) Air leaks in the suction line. Check that all
flange screw threads and gaskets are airtight.
e) Trapped air in the delivery line (see section
2.8). Check that all valves are fully open. If
necessary, let the air out by venting the delivery
line.
f) Excessive suction lift. Reduce static
suction lift.
g) Rotation speed too low. If the liquid has a
viscosity less than 20 mm²/s (cSt), do not run at
a speed less than ⅓ of the nominal speed.
h) By-pass blocked in open position by
impurities. Clean the relief valve and its seat.
5.2 LOW CAPACITY
a) Rotation speed too low. Check that the
speed corresponds to that necessary to obtain
the required capacity.
b) Suction line or filter are obstructed. The
vacuum gauge reading is high. Metallic
cavitation noise.
c) Air leaks in the suction line. The vacuum
gauge and the pressure gauge oscillate. Check
connections, threads, gaskets, welds etc.
: Air leaks in the suction line are very
N
OTE
difficult to detect. But there is no leakage if there
is vacuum in the suction line.
d) Pressure of by-pass relief valve is set too
low causing some liquid to recycle. Tighten
R-404021-2E
29/03/98