Flowserve CPXS - Manual (Page 12)

CPXS, CPXNS and CPXPS USER INSTRUCTIONS ENGLISH 71569250 07-11
Page 12 of 48 flowserve.com
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. For ultimate safety
the pump has been fitted with a magnetic drive.
(See 3.2 and 3.3 below.)
3.2 Name nomenclature
The pump size will be engraved on the nameplate
typically as below:
80-50CPXS200
Nominal suction size in mm
Nominal discharge size in mm
Configuration – see 3.3.1
Nominal ISO maximum impeller diameter
The typical nomenclature above is the general
guide to the CPXS 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 [1100] is designed with a
horizontal centreline end inlet and a vertical
centreline top outlet which makes it self venting.
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 CPXS and CPXPS the casing feet pads are
underneath the casing. On the CPXNS they are on
the shaft centreline.
In addition, the CPXPS pump casing [1100] is
designed with a self priming action which works on
the reflux principle for suction lifts up to 7 m (23 ft).
3.3.2
Impeller
An open impeller is fitted.
3.3.3
Shaft
The large diameter stiff shaft, mounted on
bearings, has a keyed drive end. The pump shaft
is fitted with a magnetic rotor and product
lubricated bearings.
3.3.4 Bearing housing
For oil lubricated bearings, a sight glass enables
the oil level to be viewed. Additional lubrication and
cooling options may be fitted.
3.3.5
Pump bearings and lubrication
The ball bearings fitted in the bearing housing may
be oil or grease lubricated. The magnetic drive
journal bearings may be lubricated by product or
from an external source.
3.3.6
Shaft seal
The magnetic drive design utilizes the shell
between the magnets to prevent leakage of the
pumped fluid.
3.3.7
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.
3.3.8
Accessories
Accessories may be fitted when specified by the
customer.
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 and
materials may influence this data. If required, a
definitive statement for your particular application
can be obtained from Flowserve.
3.4.1
Temperature limits
The pump materials and construction have been
selected for your application, however, the following
fundamental limits should not be exceeded:
Neodymium magnets -40 to +120 ºC
(-40 to +248 ºF)
Samarium cobalt magnets -40 to +250 ºC
(-40 to +482 ºF)
PEEK shell (depending on pressure)-40 to +120 ºC
(-40 to +248 ºF)
3.4.2 Ambient temperature
These pumps are generally fitted with TEFC motors
with an ambient temperature limit of +40 ºC
(104 ºF).
Specific pumps may be fitted with motors to suit
client's requirements with other ambient
temperature limits - see motor nameplate for
details.