Flowserve WR - Manual (Page 14)

WR and CR USER INSTRUCTIONS ENGLISH 26999968 10-12
Page 14 of 28 flowserve.com
5.3 Guarding
Guarding is supplied fitted to the pump set.
In member countries of the EU and EFTA, it is a legal
requirement that fasteners for guards must remain
captive in the guard to comply with the Machinery
Directive 2006/42/EC. When releasing such guards,
the fasteners must be unscrewed in an appropriate
way to ensure that the fasteners remain captive.
Whenever guarding is removed or disturbed ensure
that all the protective guards are securely refitted
prior to start-up.
5.4 Priming and auxiliary supplies
5.4.1 Filling and priming
Ensure inlet pipe and pump casing is
completely full of liquid before starting continuous
duty operation.
Priming may be carried out with an ejector, vacuum
pump interceptor or other equipment, or by flooding
from the inlet source.
When in service, pumps using inlet pipes with foot
valves may be primed by passing liquid back from the
outlet pipe through the pump.
5.5 Starting the pump
a) Ensure flushing and/or cooling/
heating liquid supplies are turned ON, before
starting pump.
b) CLOSE the outlet valve.
c) OPEN all inlet valves.
d) Prime the pump.
e) Start motor and check the outlet pressure.
f) If the pressure is satisfactory, SLOWLY open the
outlet valve.
g) Do not run the pump against a
closed valve for more than 10 seconds.
h) If NO pressure, or LOW pressure, STOP the
pump. Refer to section 7, Faults; causes and
remedies, for fault diagnosis.
5.6 Running the pump
5.6.1 Pumps fitted with packed glands
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 pressurised.
If no leakage takes place stop the unit, take out the
packing and repack to avoid the packing overheating. If
overheating takes place the pump should be stopped
and allowed to cool. before being re-packing. When
the pump is re-started it should be checked to ensure
leakage is taking place at the packed gland.
If hot liquids are being pumped it may be necessary
to slacken the gland nuts to achieve leakage.
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, normally 30 to 120 drops per minute. Bedding
in of the packing may take another 15 minutes.
5.6.2 Pumps fitted with mechanical seal
Mechanical seals require no adjustment. Any slight
initial leakage will stop when the seal is run in. Seals
will always have leakage emission from the boundary
film edge in operation.
Before pumping dirty liquids it is advisable, if possible,
to run the pump in using clean liquid to safeguard the
seal face.
For external flush or quench, this
should be started before the pump is run and allowed
to flow for a period after the pump has stopped.
Never run a mechanical seal dry, even
for a short time.
5.6.3 Bearings
If the pumps are working in a potentially
explosive atmosphere monitor temperature and/or
vibration at the bearings.
If bearing temperatures are to be monitored it is
essential that a benchmark temperature is recorded
at the commissioning stage and after the bearing
temperature has stabilized.
•
Record the bearing temperature (t) and the
ambient temperature (ta)
•
Estimate the likely maximum ambient
temperature (tb)
•
Set the alarm at (t+tb-ta+5) ºC (t+tb-ta+10) ºF
and the trip at 100 ºC (212 ºF) for oil lubrication
and 105 ºC (220 ºF) for grease lubrication
It is important, to keep a check on bearing
temperatures. After start up the temperature rise
should be gradual, reaching a maximum after
approximately 1.5 to 2 hours. This temperature should
then remain constant or marginally reduce with time.