Grundfos CR 125, Installation And Operating Instructions Manual

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English (GB)
5
English (GB) Installation and operating instructions
Original installation and operating instructions
CONTENTS
Page
1. Symbols used in this document
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
"back-to-back" arrangement in a separate seal chamber.
The pressure in the seal chamber is higher than the pump
pressure.
The double seal arrangement with pressurised seal chamber
prevents the pumped liquid from leaking to the environment via
the shaft seal.
The pressure in the seal chamber can be generated in three
ways:
• by means of a dosing pump (section
8.1 )
• by means of an already existing system.
4. Applications
The shaft seal is available for the following Grundfos pumps:
This type of shaft seal is the optimum solution when handling
abrasive or sticky liquids which would either wear out, damage or
block a mechanical shaft seal.
Recommended for applications involving toxic, aggressive or
flammable liquids, the seal shaft protects the surrounding
environment and the people working in the vicinity of the pump.
5. Maximum liquid pressure and temperature
Due to the shaft seal design, the pressure in the seal chamber
must not exceed 30 bar. The pressure of the barrier fluid must
always be higher than the pressure of the pumped liquid.
The maximum temperature of the barrier fluid depends on the
rubber material of the shaft seal.
1. Symbols used in this document
5
2. General information 5
3. Product description 5
4. Applications
5
5. Maximum liquid pressure and temperature 5
6. Barrier fluid connections 6
7. Pump with dosing pump
6
7.1 Dimensions of pump with dosing pump 6
8. Startup 7
8.1 Pump with dosing pump 7
9. Maintenance
8
10. Operation 8
10.1 Frost protection 8
11. Disposal
8
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.
Pump type CR 95 CR 125 CR 155
CR ● ● ●
CRN ● ● ●
Caution
If the shaft seal is used in applications where special
safety precautions must be observed due to
hazardous liquids, the customer bears full
responsibility!
Shaft seal Maximum temperature [°C]
EPDM +120
FKM +90
FFKM +120
FXM +120