Inhaltsverzeichnis; Symbols Used In This Document; General Information; Product Description - Grundfos CR 1s Montage- Und Betriebsanleitung

CONTENTS
1. Symbols used in this document
2. General information
3. Product description
4. Applications
5. Maximum liquid pressure and temperature
6. Barrier fluid connections
7. Pump with pressure intensifier
7.1 Components of pressure intensifier
7.2 Dimensions of pump with pressure intensifier
8. Pump with dosing pump
9. Start-up
9.1 Pump with pressure intensifier
9.2 Pump with dosing pump
10. Maintenance
11. Operation
11.1 Frost protection
12. Disposal
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 result in malfunction or damage to the
Caution
equipment!
Notes or instructions that make the job easier
Note
and ensure safe operation.

2. General information

These installation and operating instructions are a supplement to
installation and operating instructions for standard CR, CRI, CRN
pumps, publication No 96462123, and for CRN-SF pumps,
publication No 96530119.

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 pressure intensifier (section 9.1)
• by means of a dosing pump (section 9.2)
• by means of an already existing system.
4

4. Applications

Page The shaft seal is available for the following Grundfos pumps:
4
Pump CR CR CR
4
type 1s 1 3
4
CR
4
CRI
4
CRN
4
6 This type of shaft seal is the optimum solution when handling
6 abrasive or sticky liquids which would either wear out, damage or
6 block a mechanical shaft seal.
6 Recommended for applications involving toxic, aggressive or
flammable liquids, the seal shaft protects the surrounding
7
environment and the people working in the vicinity of the pump.
7
8
If the shaft seal is used in applications where
9
special safety precautions must be observed due
Caution
9
to hazardous liquids, the customer bears full
9
responsibility!
9

5. Maximum 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 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
EPDM
FKM
FFKM
FXM

6. Barrier fluid connections

Key to the letters in the drawings:
Pos. A = pumped liquid.
Pos. C/D and E = barrier fluid.
Figures 1, 2, 3 and 4 show where to fit a sensor (pos. A),
if retrofitted.
C/D
Sensor
A
Fig. 1 Seal chamber CR, CRI, CRN 1s, 1, 3, 5
CR CR CR CR CR CR CR
5 10 15 20 32 45 64
Maximum temperature [ºC]
+120
+90
+120
+120
C/D
Outlet 3/8"
A
E
Inlet 1/2"
E
CR CR CR
90 120 150