Flowserve CPXPM - Manual (Page 12)

CPXPM USER INSTRUCTIONS ENGLISH 71569160 09-09
Page 12 of 28 flowserve.com
Level with shims between baseplate and packing
pieces.
If the pump is being directly mounted onto a plinth, it
is only necessary to bolt down the pump foot.
Units fitted with 80 or 90 frame size motors require
bolting down at the pump end only. It is recommended
that bolts (not studs) are used to hold down the pump
feet to permit easy removal from the pipework.
Do not distort the pump when tightening the holding
down bolts. Use shims under the motor feet as
necessary.
All units should be securely bolted down at the pump
casing. In addition, the motor (frames 100 and
above) should be supported under its feet with metal
packing strips.
It is not necessary to bolt the motor to the foundation.
However, to simplify maintenance, it is important that
any packing strips are bolted to the motor feet. This
is so that the motor, complete with packing strips, can
be slipped back along its foundation to gain access to
the rotating element. It is important to bolt down the
pump casing first. The motor should then be packed
or shimmed to support its weight, but it should not put
any undue strain onto the pump casing. (It is not
necessary to support frame 80 and 90 motors.)
These close coupled pumps feature a
back pull-out design. This means that when correctly
installed, the rotating element can be withdrawn from
the casing without disturbing the system pipework.
The use of grouted-in studs to secure the motor feet
prevents back pull-out and will make maintenance
more difficult and time consuming. The procedures in
the above paragraphs should be followed in order to
obtain the maximum benefit from the pump design.
4.4 Grouting
Where applicable, grout in the foundation bolts.
After adding pipework connections the baseplate, if used,
should be grouted in accordance with good engineering
practice. Folded steel baseplates should be grouted to
locate their packing pieces. If in any doubt please
contact your nearest Flowserve service centre for advice.
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.
4.5.1 Suction and discharge pipework
Take into account the available NPSH which must be
higher than the required NPSH of the pump.
Never use pump as a support for piping.
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
The delivery pipework must permit priming air to
escape unhindered from the pump during the priming
cycle, without back pressure and prevent excessive
run-back of liquid on shutdown to minimise syphoning.
Priming air may be vented in one of the following ways:
1) The discharge pipework regulating valve, if fitted,
may be partly opened during the priming cycle to
freely vent the air.
2) An automatic air release valve may be fitted to the
discharge pipework, between the pump and any
valves, providing that gases and vapours given off
are environmentally safe and acceptable for
release into the atmosphere.
3) An air bleed pipe may be run from the discharge
pipework, between the pump and any valves,
back to the suction tank or sump. This
arrangement has a disadvantage in that normal
manual/automatic control will be necessary
during operation in order to prevent continuous
re-circulation of the pumped liquid.
Ensure piping and fittings are flushed
before use.