Flowserve CPXS - Manual (Page 22)

CPXS, CPXNS and CPXPS USER INSTRUCTIONS ENGLISH 71569250 07-11
Page 22 of 48 flowserve.com
g) Do not run the pump with the
outlet valve closed for a period longer than 30
seconds.
h) If NO pressure, or LOW pressure, STOP the
pump. Refer to section 7, Faults; causes and
remedies for fault diagnosis.
5.7.2 Starting the CPXPS 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. (See section
5.6.1.) The pump casing must initially be filled
with compatible liquid before starting the unit.
e) Damage will occur if the pump is
run dry or for prolonged periods with no
incoming liquid.
f) Subsequent filling should not be necessary
unless the pump has been emptied or drained of
fluid.
g) Start the motor and, if no specific provision has
been made in the delivery pipework for
evacuating the primed air, open the delivery valve
by approximately 10% to allow priming air to
escape.
h) Check outlet pressure.
i)
If the pressure is satisfactory, SLOWLY open
the outlet valve.
j) It is recommended that the priming time is
noted. Priming times in excess of 5 minutes
will indicate a pump or system fault. Any
noticeable increases in priming time on
subsequent starts will also indicate a fault.
Irregular use could lead to the risk of
'evaporation' of the priming fluid.
k) Do not run the pump with the
outlet valve closed for a period longer than 30
seconds.
l) If the pump has to self prime the system it may
take a short time before the outlet is
pressurized.
m) If NO pressure, or LOW pressure, STOP the
pump. Refer to section 7, Faults; causes and
remedies for fault diagnosis.
5.8 Running the pump
5.8.1
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) 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, 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.
5.8.2
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
Horizontal pumps
≤≤≤≤
15 kW mm/sec
(in./sec) r.m.s.
> 15 kW
mm/sec (in./sec)
r.m.s.
Normal N ≤
3.0 (0.12)
≤
4.5 (0.18)
Alarm N x 1.25 ≤ 3.8 (0.15) ≤ 5.6 (0.22)
Shutdown trip N x 2.0 ≤ 6.0 (0.24) ≤ 9.0 (0.35)
5.8.3
Stop/start frequency
Pump sets are normally suitable for a number of
equally spaced stop/starts per hour. Generally six
stop/starts per hour may be satisfactory. Refer
frequent stop/starting to the motor manufacturer.