Flowserve IDP CPXV - Manual (Page 14)

CPXV and CPXRV USER INSTRUCTIONS ENGLISH 71569193 09-14
Page 14 of 48
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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.
Discharge
flange size
mm (in.)
Maximum forces (F) in kN (lbf) and moments (M) in Nm (lbf •ft)
Fx Fy Fz Fr Mx My Mz Mr
40 (1.5) 0.71 (160) 0.58 (130) 0.89 (200) 1.28 (290) 0.46 (340) 0.23 (170) 0.35 (260) 0.62 (460)
50 (2.0) 0.71 (160) 0.58 (130) 0.89 (200) 1.28 (290) 0.46 (340) 0.23 (170) 0.35 (260) 0.62 (460)
80 (3.0) 1.07 (240) 0.89 (200) 1.33 (300) 1.93 (430) 0.95 (700) 0.47 (350) 0.72 (530) 1.28 (950)
100 (4.0) 1.42 (320) 1.16 (260) 1.78 (400) 2.56 (570) 1.33 (980) 0.68 (500) 1.00 (740) 1.80 (1 330)
125 (5.0) 1.95 (440) 1.58 (355) 2.45 (550) 3.50 (790) 1.93 (1 420) 0.98 (720) 1.36 (1 000) 2.56 (1 880)
150 (6.0) 2.49 (560) 2.05 (460) 3.11 (700) 4.48 (1010) 2.30 (1 700) 1.18 (870) 1.76 (1 300) 3.13 (2 310)
200 (8.0) 3.78 (850) 3.11 (700) 4.89 (1 100) 6.92 (1560) 3.53 (2 600) 1.76 (1 300) 2.58 (1 900) 4.71 (3 500)
250 (10.0) 5.34 (1 200) 4.45 (1 000) 6.67 (1 500) 9.63 (2 200) 5.02 (3 700) 2.44 (1 800) 3.80 (2 800) 6.75 (5 000)
4.5.4
Auxiliary piping
4.5.4.1 Pumps fitted with a sole plate packed
gland
Ensure lubrication is supplied to the
gland packing. High temperature molten salt builds
require a Nitrogen gas injection at 3.4 m
3
/h (2 ft
3
/min)
to the gland packing and this must be operating
whenever adjusting the packing.
4.5.4.2 Pumps fitted with mechanical seals
Double seals require a barrier liquid between the
seals, compatible with the pumped liquid.
With back-to-back double seals, the barrier liquid
should be at a minimum pressure of 1 bar (15 psi)
above the maximum pressure on the pump side of
the inner seal. The barrier liquid pressure must not
exceed limitations of the seal on the atmospheric
side.
For toxic service the barrier liquid supply and
discharge must be handled safely and in line with
local legislation.
Special seals may require modification to auxiliary
piping described above. Seal on pumps in potentially
explosive atmospheres shall comply with section
1.6.4.3. Consult Flowserve if unsure of correct method
or arrangement.