Flowserve CPXV fitted with Mark 3 ASME hydraulics - Manual (Page 14)

CPXV with Mark 3 ASME hydraulics ENGLISH 71569291 12-14
Page 14 of 44
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4.3.2 Packing pieces
Where the sole plate and its counter-face do not each
have a machined face, packing pieces (metallic shims)
will need to be placed evenly adjacent to the foundation
(holding down) bolts to avoid
“soft-foot” distortion. Turn
shaft clockwise by hand to ensure it is free to turn.
Soft-foot distortion may significantly increase vibration
and damage equipment by causing distortion and
should normally be inspected. If high vibration occurs
when pump is run (see Section 5, Commissioning, start-
up, operation and shutdown) place a vibration meter at
the side of the motor as soft-foot is most effectively
reduced when the vibration is reduced to a minimum.
Overall vibration measurement can be used - it is not
necessary to use a vibration spectrum to pick up soft-
foot which occurs at 1x running speed and should be
the first issue to check.
To adjust for soft-foot use a dial gauge on the sole
plate top face near to the holding down bolt, zero it,
record the soft-foot spring in the sole plate and undo
one holding down bolt at a time.
Soft-foot is removed by inserting packing pieces
(metallic shims) equal to or slightly less than the soft-
foot spring amount recorded at the individual holding
down point locations. Re-torque the holding down bolt.
Continue this procedure for each holding down bolt
position in turn, one at a time. The thickness of
packing pieces (metallic shims) adjacent to an
individual holding down bolt should not exceed 3 mm
(0.12 in.); ie soft-foot spring is not to exceed 3 mm
(0.12 in.) at any individual location.
4.4 Grouting
Where applicable, grout in the foundation bolts.
Grouting provides solid contact between the pump unit
and foundation, prevents lateral movement of vibrating
equipment and dampens resonant vibrations.
4.5 Piping
Protective covers are fitted to the pipe
connections to prevent foreign bodies entering during
transportation and installation. Ensure that these
covers are removed from the pump before connecting
any pipes.
If sludge and debris can build up in the sump it
is recommended to use a strainer with a maximum
opening size of 6 mm (0.024 in.) and a free surface
area greater than three times the pump suction area.
Category 1/2 and 1/3 pumps must be fitted with a
strainer.
Maximum forces and moments allowed on the pump
flanges vary with the pump size and type. To minimize
these forces and moments that may, if excessive, cause
misalignment, hot bearings, worn couplings, vibration
and the possible failure of the pump casing, the
following points should be strictly followed:
 Prevent excessive external pipe load
 Never draw piping into place by applying force to
pump flange connections
 Do not mount expansion joints so that their force,
due to internal pressure, acts on the pump flange
4.5.1 Discharge pipework
In order to minimize friction losses and hydraulic
noise in the pipework it is good practice to choose
pipework that is one or two sizes larger than the
pump discharge. Typically main pipework velocities
should not exceed 3 m/s (9 ft/sec) on the discharge.
Never use the pump as a support for
piping.
Ensure piping and fittings are flushed
before use.
Ensure piping for hazardous liquids is arranged
to allow pump flushing before removal of the pump.
4.5.2 Discharge piping
A non-return valve should be located in the discharge
pipework to protect the pump from excessive back
pressure and hence reverse rotation when the unit is
stopped.
Fitting an isolation valve will allow easier maintenance.
4.5.3 Maximum forces and moments allowed on
the main sole plate discharge flange
The table below uses the sign convention shown for the
pump sole plate discharge flange maximum forces and
moments. These are valid for a pump end up to 100 ºC
(212 ºF) and the sole plate on a rigid foundation.