Flowserve DS - Manual (Page 22)

DS USER INSTRUCTIONS ENGLISH 71576283 - 02/13
02
Page 22 of 36 flowserve.com
h) Ensure inlet pipe and pump casing are
completely full of liquid.
i) If stuffing box sealing/quenching from a remote
source is required make sure there is liquid
supply.
j) Check for sufficient lube oil.
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.
c) 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.
When adjusting an operating stuffing box
(shield grids removed for this operation) the operator
must be very careful. Safety gloves are compulsory
and loose clothes are not allowed (above all to the
arms) to avoid being caught by the pump shaft.
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.
SAFETY INSTRUCTIONS WHEN THE PUMP IS
RUNNING:
If hot or freezing components of the machine
can present a danger to operators, they must be
shielded to avoid accidental contact. If a 100 %
protection is not possible, the machine access must
be confined to the maintenance staff only.
If the temperature is greater than 80 °C (176
°F), a warning plate must be clearly placed on the
pump.
It is strictly forbidden to open switch
cupboards, switch boxes, or all other live electric
equipment.