Flowserve CPXV fitted with Mark 3 ASME hydraulics - Manual (Page 22)

CPXV with Mark 3 ASME hydraulics ENGLISH 71569291 12-14
Page 22 of 44
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When the pump is re-started, check to ensure leakage
is taking place at the packed gland.
Care must be taken when adjusting the gland
on an operating pump. Safety gloves are essential.
Loose clothing must not be worn to avoid being
caught up by the pump shaft. Shaft guards must be
replaced after the gland adjustment is complete.
5.8.2 Pumps fitted with mechanical seals
Mechanical seals require no adjustment. Any slight
initial leakage will stop when the seal is run in.
Before pumping dirty liquids it is advisable, if
possible, to run the pump in using clean liquid to
safeguard the seal face.
External flush or quench shall be started
before the pump is run and allowed to flow for a period
after the pump has stopped.
5.8.3 Thrust bearings
If the pumps are working in a potentially explosive
atmosphere without regular monitoring, temperature
monitoring of the thrust bearing is recommended. For
temperature classes T5 and T6 thrust bearing
monitoring must be fitted.
If the thrust 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) º C (t+tb-ta+10 ºF)
and the trip at 100 ºC (212 ºF) for oil lubrication
and 105 ºC (220 ºF) for grease lubrication.
Ensure that the ATEX temperature class limit is
not exceeded if the pump is operating in a
hazardous area. The normal bearing
temperature T
n
is = t+t
b
-t
a
where T
n
<T
c
. In the
case of T5 and T6, the critical bearing
temperature T
c
= 65
o
C (T6) or 80
o
C (T5)
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 5.2.5
for further information.)
5.8.4 Line bearing temperature
When pump are equipped for
monitoring of line bearing temperature the normal
and shut off levels must be set to:

The normal bearing temperature T
n
is the flush
line maximum liquid temperature +5 °C (+9 °F)

The critical bearing temperature T
c
is set to
applicable ATEX class limit -10 °C (-18 °F).
(See table in section 1.6.4.3.)
If the measured bearing temperature exceeds the T
c
value the system must give an alarm to the pump
operator or the pump must be automatically stopped
and the cause investigated before restarting the pump.
5.8.5 Line bearing lubrication
For pumps equipped with flow
monitor for the individual line bearings, the bearing
flush to each line bearing shall be controlled
according the following table:
Pump frame size
Normal flow Q
n
l/min (USgpm)
Critical flow Q
c
l/min (USgpm
1 4.2 (1.2) 3.6 (1)
2 5 (1.4) 4.3 (1.2)
3 5.9 (1.6) 5 (1.4)
4 6.7 (1.8) 5.7 (1.5)
For bearing frame size see section 8.7 first column.
If either line bearing flush is reduced to below the Q
c
values the pump must be stopped and the cause
investigated.
5.8.6 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.
Regular monitoring of the pump
vibration is recommended to show any deterioration in
pump or system operating conditions. The vibration is
measured adjacent to the pump thrust bearing.
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.
For remote installations continuous monitoring and
automatic alert and shutdown is recommended.
Vibration velocity – unfiltered mm/s (in./sec) r.m.s.
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)