Flowserve IDP CPXV - Manual (Page 21)

CPXV and CPXRV USER INSTRUCTIONS ENGLISH 71569193 09-14
Page 21 of 48
flowserve.com
5.8 Running the pump
5.8.1
Pumps fitted with packed gland
Never run gland packing dry, even for
a short time.
5.8.1.1 Nitrogen lubricated packed gland
(e.g. molten salt pumps)
Pumps for high temperature molten salt utilize special
metal gland packing rings cooled and lubricated only
by nitrogen gas. The nitrogen injection flow rate should
be monitored periodically after initial stuffing box
adjustment to maintain the flow rate advised on the
general arrangement drawing.
On molten salt service that uses metal gland
packing rings, the packing is not to be adjusted while
the pump is in operation.
5.8.1.2 Grease lubricated packed gland
(e.g. molten sulphur pumps)
The gland must be adjusted evenly bringing both
nuts down evenly in small steps until the lubricant leakage
is reduced as required. If no grease leakage takes place
the packing will overheat.
Grease lubricated packed gland units will be fitted with
packing greased on initial assembly. Gland nuts should
initially be finger-tight only prior to heat up. Leakage
of the lubricant should take place soon after the
stuffing box is pressurised. If no grease leakage takes
place the packing will overheat. It is important that
adjustment of the packing is even to maintain concentric
alignment of the gland ring to avoid excess temperature.
If no visible leakage takes place the packing will begin to
overheat when the pump is turning. If overheating takes
place the pump should be stopped in a controlled manner
and allowed to cool before being re-started. 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.
5.8.1.3 Liquid lubricated packed gland
The gland must be adjusted evenly bringing both
nuts down evenly in small steps until the lubricant leakage
is reduced as required. If no grease leakage takes place
the packing will overheat.
Where liquid is permitted for a low temperature pump
gland packing lubricant, the liquid must be a safe
liquid, in which case there must be some visible
leakage from the gland. Gland nuts should initially be
finger-tight only prior to heat up. Leakage of the
lubricant should take place soon after the stuffing box
is pressurised. The pump should be run for 30
minutes with steady leakage and the gland nuts
tightened by 10 degrees at a time until leakage is
reduced to an acceptable level. Bedding in of the
packing may take another 30 minutes.
It may be
necessary to slacken the gland nuts to achieve leakage
on this type of non-metal packing arrangement. It is
important that adjustment of the packing is even to
maintain concentric alignment of the gland ring to avoid
excess temperature.
If no visible leakage takes place the
packing will begin to overheat when the pump is turning.
If overheating takes place the pump should be stopped in
a controlled manner and allowed to cool before being re-
started. 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)