CPX, CPXR, CPXN and CPXP USER INSTRUCTIONS ENGLISH 71569117 02-10
Page 11 of 44
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3 DESCRIPTION
3.1 Configurations
The pump is a modular designed centrifugal pump
that can be built to achieve almost all chemical liquid
pumping requirements. (See 3.2 and 3.3 below.)
3.2 Name nomenclature
The pump size will be engraved on the nameplate
typically as below:
80-50CPX200
Nominal suction size in mm
Nominal discharge size in mm
Configuration – see 3.3.1 and 3.3.2 below
Nominal ISO 2858 maximum impeller diameter
The typical nomenclature above is the general guide
to the CPX configuration description. Identify the
actual pump size and serial number from the pump
nameplate. Check that this agrees with the
applicable certification provided.
3.3 Design of major parts
3.3.1 Pump casing
The pump casing is designed with a horizontal
centreline end inlet and a vertical centreline top outlet
which makes it self venting.
In addition, the CPXP pump casing is designed with a
self priming action which works on the reflux principle
for suction lifts up to 7 m (23 ft).
For ease of maintenance, the pump is constructed so
that pipe connectors do not have to be disturbed
when internal maintenance is required.
On the CPX, CPXR and CPXP the casing feet pads
are underneath the casing. On the CPXN they are on
the shaft centreline.
3.3.2 Impeller
An open impeller is fitted. (On the CPXR the impeller
is recessed into the back of the casing.)
3.3.3 Shaft
The large diameter stiff shaft, mounted on bearings,
has a keyed drive end.
3.3.4 Bearing housing
The bearing housing enables adjustment of impeller
face clearance via the bearing carrier jacking screws.
3.3.5 Pump bearings and lubrication
The pump is fitted with ball and or roller type bearings
which may be configured differently dependent on
use. The bearings may be oil or grease lubricated.
3.3.6 Cover
The cover has spigots between the pump casing and
bearing housing for optimum concentricity.
A fully confined gasket forms the seal between the
pump casing and the cover.
The covers designs provide improved performance of
mechanical seals.
The design enables one of a number of sealing
options to be fitted.
3.3.7 Shaft seal
The mechanical seal(s) attached to the drive shaft
seals the pumped liquid from the environment. Gland
packing may be fitted as an option on the CPX, CPXR
and CPXN.
3.3.8 Driver
The driver is normally an electric motor. Different drive
configurations may be fitted such as internal combustion
engines, turbines, hydraulic motors etc driving via
couplings, belts, gearboxes, drive shafts etc.
3.3.9 Accessories
Accessories may be fitted when specified by the
customer.
Fan cooling is available for high temperature operation.
(This is a fan fitted within the coupling guard to blow
cooling air over the bearing housing and shaft.)
3.4 Performance and operating limits
This product has been selected to meet the
specifications of the purchase order. See section 1.5.
The following data is included as additional
information to help with your installation. It is typical,
and factors such as temperature, materials, and seal
type may influence this data. If required, a definitive
statement for your particular application can be
obtained from Flowserve.
3.4.1 Operating limits
Normal maximum ambient temp. +40 ºC (104 ºF).
Maximum pump speed: refer to the nameplate.
