Flowserve MEN - Manual (Page 23)

MEN USER INSTRUCTIONS ENGLISH 71576288 - 02/13
Page 23 of 36 flowserve.com
5.4 Starting the pump
5.4.1 Bring controls and preparation before the
first starting and after each service call
Necessarily:
a) Check the tightening of the different plugs.
b) Check that the gland lightly tightens the packing
rings.
c) Risk of seal ring overheating.
d) Check the direction of rotation of the motor.
Refer to the rotation arrow of the pump.
e) Install all protection systems and more
particularly the coupling guard and the shield
grid (reference [9331]) of the bearing.
f) Open all suction valves (if existing).
g) Close the outlet valve and the bypass valve.
h) Ensure inlet pipe and pump casing are
completely full of liquid.
5.4.2 First pump start-up
Suction valves must be fully open
when pump is running. Never run the pump dry, it
will cause damage.
a) Start motor and check outlet pressure.
b) If pressure is satisfactory, slowly OPEN outlet
valve.Do not run the pump with the outlet valve
closed for a period longer than 30 seconds.
d) If NO pressure, or LOW pressure, STOP the
pump. Refer to faultfinding chart for fault
diagnosis.
The pump should run smoothly and without
vibration.
The pump must never run at a capacity of less than
40 % of that at the best efficiency.
Never remove a plug when the pump is
running.
5.5 Running the pump
5.5.1 Venting the pump
Vent the pump to enable all trapped air to
escape taking due care with hot or hazardous
liquids.
Under normal operating conditions, after the pump
has been fully primed and vented, it should be
unnecessary to re-vent the pump.
5.5.2 Pump fitted with a stuffing box
If the pump has a packed gland there must be some
leakage from the gland. Gland nuts should initially
be finger tight only. Leakage should take place soon
after the stuffing box is pressurized. If no leakage
takes place the packing will begin to overheat. If
overheating takes place the pump should be
stopped and allowed to cool before being restarted.
When the pump is restarted it should be checked to
ensure leakage is taking place at the packed gland.
The pump should be run for ten minutes with steady
leakage and the gland nuts tightened by 10 degrees
at a time until leakage is reduced to an acceptable
level. The temperature of the gland should be
checked after each round of tightening. If the
temperature starts to climb rapidly then back off the
gland nuts until the temperature drops down. Wait
for the temperature to stabilize before tightening
again. The leakage must not be reduced below a
rate of 20 drops per minute. Bedding in of the
packing may take several hours.
Shield grids being removed during installation
of the gland packing, it must be ensured that they
are replaced as soon as this operation is completed.
5.5.3 Pump fitted with mechanical seal
A mechanical seal ensures a seal without leakage
and does not need any adjustment. Nevertheless if a
light leakage occurs during start-up, it should
disappear after the initial running in of the friction
faces.
NEVER RUN A MECHANICAL SEAL
DRY, EVEN FOR A SHORT WHILE.