English
(GB)
4
English (GB)
Installation and operating instructions
Original installation and operating instructions.
CONTENTS
Page
1. Symbols used in this document
2. General information
This document is a supplement to installation and operating
instructions of CR, CRI, CRN standard pumps, publication
number 96462123.
3. Type key
4. Applications
CRN-SF pumps are used for pressure boosting and circulation in
systems operating with high pressures. The pump requires a
minimum inlet pressure of 2 bar and is usually supplied together
with a CRN pump which is installed as a feed pump for the
CRN-SF pump.
5. Technical data
5.1 Minimum inlet pressure
2 bar at +20 °C.
If the liquid temperature is higher than +20 °C, the inlet pressure
must be increased according to
on page 29.
Example
The operating temperature is +80 °C. The total inlet pressure
must thus be 2 bar + 0.5 bar = 2.5 bar.
5.2 Maximum inlet pressure
5.3 Maximum operating pressure
50 bar.
During start-up
If both pumps start at the same time, it is not necessary to take
the inlet pressure to the CRN-SF pump into account.
5.4 Dimensions
See
on page 28.
5.5 Electrical data
See the motor nameplate.
5.3 Maximum operating pressure
Warning
Prior to installation, read these installation and
operating instructions. Installation and operation
must comply with local regulations and accepted
codes of good practice.
Warning
If these safety instructions are not observed,
it may result in personal injury!
Caution
If these safety instructions are not observed,
it may result in malfunction or damage to the
equipment!
Note
Notes or instructions that make the job easier
and ensure safe operation.
Example
CRN- 10 - 21- SF - X - X - X- XXXX
Type range
Rated flow rate in m
3
/h
Number of impellers
Code for pump version
Code for pipe connection
Code for materials
Code for rubber parts
Code for shaft seal
CRN-SF
Static pressure
[bar]
Pressure during
operation
[bar]
3, 5
15
25
10, 15, 20
10
25
32, 45, 64, 90
10
25
Caution
The actual inlet pr the maximum pump
pressure (at no flow) must not exceed 50 bar.
Caution
The pump must not to run against a closed
discharge valve.
Caution
If the pumps cannot start at the same time due to
the total locked-rotor current, the CRN-SF pump
must start first, followed by the feed pump with a
delay of maximum three seconds.
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