Flowserve FRBHJC - Manual (Page 26)

FRBHJC USER INSTRUCTIONS ENGLISH 71569179 11-04
Page 26 of 42
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i) If NO pressure, or LOW pressure, STOP the pump.
Refer to section 7, Faults; causes and remedies,
for fault diagnosis.
5.7 Running the pump
5.7.1 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.
5.7.4 Bearings
If the pumps are working in a potentially
explosive atmosphere temperature or vibration
monitoring at the bearings is recommended
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)
°
C [(t+tb-ta+10)
°
F] and the
trip at 100
°
C (212
°
F) for oil lubrication and 105
°
C
(220
°
F) for grease lubrication.
It is important, particularly with grease lubrication, 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 rise should then remain constant or
marginally reduce with time. Refer to section 6.2.3.1
for further information.
5.7.5 Normal vibration levels, alarm and trip
For guidance, pumps generally fall under a
classification for rigid support machines within the
International rotating machinery standards and the
recommended maximum levels below are based on
those standards.
Alarm and trip values for installed
pumps should be based on the actual measurements
(N) taken on the pump in the fully commissioned as
new condition. Measuring vibration at regular intervals
will then show any deterioration in pump or system
operating conditions.
Vibration velocity – unfiltered
mm/s (in./s) r.m.s.
FRBHJC
Normal N ≤
7.1 (0.28)
Alarm N x 1.25 ≤
9.0 (0.35)
Shutdown trip N x 2.0 ≤
14.2 (0.56)
5.7.6 Stop/start frequency
Pump sets are normally suitable for the number of
equally spaced stop/starts per hour shown in the table
below. Check actual capability of the driver and
control/starting system before commissioning.
Motor rating kW (hp)
Maximum stop/starts
per hour
Up to 15 (20) 15
Between 15 (20) and 90 (120) 10
Above 90 (120) 6
Where duty and standby pumps are installed it is
recommended that they are run alternately every week.
5.8 Stopping and shutdown
a) Close the outlet valve, but ensure
that the pump runs in this condition for no more
than a few seconds.
b) Stop the pump.
c) Switch off flushing and/or cooling/heating liquid
supplies at a time appropriate to the process.
d) For prolonged shut-downs and
especially when ambient temperatures are likely to
drop below freezing point, the pump and any
cooling and flushing arrangements must be drained
or otherwise protected.
5.9 Hydraulic, mechanical and electrical
duty
This product has been supplied to meet the
performance specifications of your purchase order,
however it is understood that during the life of the
product these may change. The following notes may
help the user decide how to evaluate the implications of
any change. If in doubt contact your nearest Flowserve
office.
5.9.1 Specific gravity (SG)
Pump capacity and total head in metres (feet) do not
change with SG, however pressure displayed on a
pressure gauge is directly proportional to SG. Power
absorbed is also directly proportional to SG. It is
therefore important to check that any change in SG will
not overload the pump driver or over-pressurize the
pump.