Symbols Used In This Document; General Information; Product Description; Applications - Grundfos CR 95 Installation And Operating Instructions Manual
Double shaft seal (back-to-back)
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Also See for CR 95:
- Installation and operating instructions manual (92 pages) ,
- Data booklet (36 pages) ,
- Service instructions manual (32 pages)
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English (GB) Installation and operating instructions
Original installation and operating instructions
CONTENTS
1.
2.
3.
4.
5.
6.
7.
7.1
8.
8.1
9.
10.
11.
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
ensure safe operation.
2. General information
These installation and operating instructions are a supplement to
installation and operating instructions for standard CR, CRN
Page
pumps, publication No 99078486.
5
3. Product description
5
This type of double seal consists of two shaft seals mounted in a
5
"back-to-back" arrangement in a separate seal chamber.
5
The pressure in the seal chamber is higher than the pump
5
pressure.
6
The double seal arrangement with pressurised seal chamber
6
prevents the pumped liquid from leaking to the environment via
6
the shaft seal.
7
The pressure in the seal chamber can be generated in three
7
ways:
8
•
by means of a dosing pump (section 8.1)
8
•
by means of an already existing system.
8
4. Applications
8
The shaft seal is available for the following Grundfos pumps:
Pump type
CR
CRN
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.
If the shaft seal is used in applications where special
safety precautions must be observed due to
Caution
hazardous liquids, the customer bears full
responsibility!
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.
Shaft seal
CR 95
CR 125
●
●
●
●
Maximum temperature [°C]
+120
+90
+120
+120
CR 155
●
●
5
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