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English (GB) Installation and operating instructions
Original installation and operating instructions
CONTENTS
1.
2.
3.
4.
5.
5.1
6.
7.
8.
8.1
9.
10.
Prior to installation, read these installation and
operating instructions. Installation and operation
must comply with local regulations and accepted
codes of good practice.
1. Symbols used in this document
Warning
If these safety instructions are not observed, it may
result in personal injury.
If these safety instructions are not observed, it may
Caution
result in malfunction or damage to the equipment.
Notes or instructions that make the job easier and
Note
ensure safe operation.
2. General information
These installation and operating instructions are a supplement to
installation and operating instructions for standard CR, CRN
pumps, publication No 99078486.
3. Product description
This type of double seal consists of two shaft seals mounted in a
tandem arrangement in a separate seal chamber.
Page
The seal can be used in these cases:
•
The pump is operating with a negative pressure (vacuum).
5
•
The pump is pumping crystallised liquids, for instance sugar.
5
•
The pump is pumping hardening liquids (oil products).
5
•
The liquid temperature is up to 150 °C.
5
5
Only Grundfos cartridge seals can be used.
Note
5
6
If the primary seal is leaking, the pumped liquid will be flushed
away by the flushing liquid.
6
7
4. Applications
7
The seal shaft is available for the following Grundfos pumps:
7
7
5. Flushing liquid
Select the flushing liquid according to the application and must
not chemically attack the material of the pump and the shaft seal.
The flushing-liquid flow must also be matched to the application
(recommended flow rate 25-200 l/h).
Warning
Never connect the flushing-liquid supply directly to
the public water supply system. Observe local
regulations.
It is possible to connect the seal chamber to a separate flushing-
liquid tank. In such cases, the manufacturer's installation and
operating instructions must be observed.
5.1 Maximum flushing-liquid pressure and
temperature
Due to the shaft seal design, the pressure in the seal chamber
must not exceed 25 bar. The pressure of the flushing liquid must
always be lower than the pressure of the pumped liquid.
The maximum temperature of the flushing liquid depends on the
rubber material of the shaft seal.
Shaft seal
CR 95
CR 125
●
●
●
●
Maximum temperature
[°C]
120
90
120
120
CR 155
●
●
5
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