Flowserve CPXS - Manual (Page 16)

CPXS, CPXNS and CPXPS USER INSTRUCTIONS ENGLISH 71569250 07-11
Page 16 of 48 flowserve.com
f) Never throttle pump on suction side and never
place a valve directly on the pump inlet nozzle.
g) The pump is fitted with silicon carbide bearings
therefore small non-abrasive solids less than
0.3 mm (0.012 in.) in diameter can be handled
providing they constitute no more than 2.5% by
volume of liquid handled.
h) Solids must be non-magnetic, must not have a
tendency to coagulate and must not be fibrous.
They should also be non-abrasive and must
not scale wetted surfaces. For services other
than above you are recommended to contact
Flowserve for advice.
4.6.3
Discharge piping
4.6.3.1
CPXS and CPXNS 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.
4.6.3.2
CPXPS discharge piping
a) 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. Pipework explanders should have
a maximum angle of divergence of 9 degrees.
b) If a non-return valve is located in the discharge
pipework then a vent/bleed pipe should be fitted
from the discharge pipe back to the sump or
source tank.
c) A regulating valve should be fitted in the
discharge pipework unless pump flow is
controlled by the delivery system design.
4.6.4
Allowable Nozzle loads
The pump complies with ISO 5199 shaft deflection
limits for the following flange loads. The values are
presented in the ISO 5199/ISO 13709 (API 610)
format. Please note that the values permitted may
be higher or lower than those in ISO 5199; see
those specified for the actual pump size.
The values permitted for the pump with nozzle
(50mm and above) meet ISO 13709 (API610)
Table 4 values with grouted metallic baseplates.
Individual forces and moments up to twice ISO
13709 (API610) Table 4 values may be permitted
but only when applied in accordance with the
conditions in ISO 13709 (API610) Annex F.
Values are presented in compliance with the ISO
1503 sign convention.
All individual values which are greater than the
following values must be referred to Flowserve for
approval.
The values in the table on next page must be
multiplied by the following factors.
Liquid Temperature °C (°F)
Casing Material -20 to 100
(-4 to 212)
101 to 200
(213 to 392)
201 to 250
(393 to 482)
Nickel 0.5 0.475 0.45
Austentic DCI,
Alloy 20,
Titanium &
Titanium Pd
0.8 0.76 0.72
All other CPX
materials
1 0.95 0.9