Installation And Operating Instructions; Symbols Used In This Document; General Information; Related Installation And Operating Instructions - Grundfos NK Serie Instrucciones De Instalación Y Mantenimiento

English (GB) Installation and operating instructions
Original installation and operating instructions.
CONTENTS
1. Symbols used in this document
2. General information
3. Related installation and operating instructions
4. NK, NKG bare shaft pumps
5. Explosion protection document
6. Identification
7. Scope of ATEX categories for NK, NKG pumps
8. Installation
8.1 Pump with single seal
8.2 Pump with double seal (back-to-back or tandem)
8.3 Barrier or flushing liquid connections of dead-end
solutions
8.4 Checking the direction of rotation
8.5 Pit installation
8.6 Bypass with pressure-relief valve
8.7 Monitoring of bearing condition
8.8 Earthing of pump housing
9. Operating conditions
9.1 Maximum liquid temperature
9.2 Vacuum operation or suction lift
10. Before starting an ATEX-approved pump
11. Maintenance/inspection
Warning
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.
Warning
If these instructions are not observed, it may lead
to electric shock with consequent risk of serious
personal injury or death.
If these safety instructions are not observed,
Caution
it may result in malfunction or damage to the
equipment.
Notes or instructions that make the job easier
Note
and ensure safe operation.

2. General information

These supplementary installation and operating instructions apply
to ATEX-approved Grundfos NK, NKG pumps and NK, NKG bare
shaft pumps. The pumps comply with ATEX Directive 94/9/EC.
The pumps are suitable for use in areas (zones) classified
according to the directive 1999/92/EC. In case of doubt, please
consult the above-mentioned directives, or contact Grundfos.

3. Related installation and operating instructions

In addition to these instructions, the following installation and
operating instructions must be observed:
Page • NK, NKG
product number 96646512.
5
For special versions of the pumps, observe the relevant
5

installation and operating instructions:

5
• NKG - Double seal (back-to-back)
5
product number 97527932
5
• NKG - Double seal (tandem)
5
product number 97527931.
6

4. NK, NKG bare shaft pumps

6
6
ATEX-approved NK, NKG bare shaft pumps are supplied with an
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ATEX marking similar to that of the ATEX-approved NK, NKG
pump. See section 6. Identification.
7
Installation and operating instructions mentioned in section 3.
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also apply to ATEX-approved NK, NKG bare shaft pumps.
7
7

5. Explosion protection document

7
7 The combination of NK, NKG pump and all monitoring equipment
must be described in the explosion protection document
7
according to the directive 1999/92/EC. The responsibility rests
7
with the installer/owner.
8
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6. Identification

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The nameplate on the pump head gives the following details:
• data for the standard pump
• data for the ATEX marking, pos. 1 and 2.
Type
NK 125-250/269 AE-F2-A-E-SBAQE
B 96029550 P2 0514 0001
Model
Q
300
- / -
p/t
II 2G c T3-T5
Fig. 1 Nameplate of ATEX-approved pump with single seal
Data for the ATEX marking only refers to the pump part including
the coupling. The motor has a separate nameplate.
ATEX-related positions on the pump nameplate:
Pos. Description
1 ATEX rating
II
2G
T3-T5
2 Technical file number
96564262
X
m /h 3 H m n
21 1460
bar/°C Made in HUNGARY
MAX
Tech.file
96564262 X
1
Group II
Category 2, gas
Temperature class of the pump.
The temperature class indicates the
maximum surface temperature of the
pump during normal operation.
Number of technical file stored at KEMA
(CE 0344).
The letter X indicates that the equipment
is subject to special conditions for safe
use. The conditions are mentioned in this
document.
min -1
2
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