Grundfos NK Series User manual

GRUNDFOS INSTRUCTIONS
NK, NKG
ATEX-approved pumps
Installation and operating instructions

NK, NKG
Table of contents
3
English (GB)
Installation and operating instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Български (BG)
Упътване за монтаж иексплоатация . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Čeština (CZ)
Montážní a provozní návod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Dansk (DK)
Monterings- og driftsinstruktion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Deutsch (DE)
Montage- und Betriebsanleitung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Eesti (EE)
Paigaldus- ja kasutusjuhend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Ελληνικά (GR)
Οδηγίες εγκατάστασης και λειτουργίας . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Español (ES)
Instrucciones de instalación y funcionamiento. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Français (FR)
Notice d'installation et de fonctionnement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Hrvatski (HR)
Montažne i pogonske upute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Italiano (IT)
Istruzioni di installazione e funzionamento. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Қазақша (KZ)
Орнату жəне пайдалану нұсқаулықтары . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Latviešu (LV)
Uzstādīšanas un ekspluatācijas instrukcija . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Lietuviškai (LT)
Įrengimo ir naudojimo instrukcija . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Magyar (HU)
Szerelési és üzemeltetési utasítás. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Nederlands (NL)
Installatie- en bedieningsinstructies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Українська (UA)
Інструкції змонтажу та експлуатації . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Polski (PL)
Instrukcja montażu i eksploatacji . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Português (PT)
Instruções de instalação e funcionamento. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Русский (RU)
Руководство по монтажу иэксплуатации . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Română(RO)
Instrucţiuni de instalare şi utilizare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Slovenčina (SK)
Návod na montáž a prevádzku . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Slovensko (SI)
Navodila za montažo in obratovanje . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Srpski (RS)
Uputstvo za instalaciju i rad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Table of contents
4
Suomi (FI)
Asennus- ja käyttöohjeet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Svenska (SE)
Monterings- och driftsinstruktion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Appendix 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

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 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:
•NK,NKG
product number 96646512.
For special versions of the pumps, observe the relevant
installation and operating instructions:
• NKG - Double seal (back-to-back)
product number 97527932
• NKG - Double seal (tandem)
product number 97527931.
4. NK, NKG bare shaft pumps
ATEX-approved NK, NKG bare shaft pumps are supplied with an
ATEX marking similar to that of the ATEX-approved NK, NKG
pump. See section 6. Identification.
Installation and operating instructions mentioned in section 3.
also apply to ATEX-approved NK, NKG bare shaft pumps.
5. Explosion protection document
The combination of NK, NKG pump and all monitoring equipment
must be described in the explosion protection document
according to the directive 1999/92/EC. The responsibility rests
with the installer/owner.
6. Identification
The nameplate on the pump head gives the following details:
• data for the standard pump
• data for the ATEX marking, pos. 1 and 2.
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:
1. Symbols used in this document 5
2. General information 5
3. Related installation and operating instructions 5
4. NK, NKG bare shaft pumps 5
5. Explosion protection document 5
6. Identification 5
7. Scope of ATEX categories for NK, NKG pumps 6
8. Installation 6
8.1 Pump with single seal 6
8.2 Pump with double seal (back-to-back or tandem) 6
8.3 Barrier or flushing liquid connections of dead-end
solutions 7
8.4 Checking the direction of rotation 7
8.5 Pit installation 7
8.6 Bypass with pressure-relief valve 7
8.7 Monitoring of bearing condition 7
8.8 Earthing of pump housing 7
9. Operating conditions 7
9.1 Maximum liquid temperature 7
9.2 Vacuum operation or suction lift 8
10. Before starting an ATEX-approved pump 8
11. Maintenance/inspection 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.
Warning
If these instructions are not observed, it may lead
to electric shock with consequent risk of serious
personal injury or death.
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.
TM05 1666 3411
Pos. Description
1ATEX rating
II Group II
2G Category 2, gas
T3-T5
Temperature class of the pump.
The temperature class indicates the
maximum surface temperature of the
pump during normal operation.
2Technical file number
96564262 Number of technical file stored at KEMA
(CE 0344).
X
The letter X indicates that the equipment
is subject to special conditions for safe
use. The conditions are mentioned in this
document.
bar/°CMAX
m /h
3H
Q
p/t
mnmin -1
Model
96561896
Made in
Tech.file
Type
300 21 1460
- / -
96564262 XII 2G c T3-T5
NK 125-250/269 AE-F2-A-E-SBAQE
B 96029550 P2 0514 0001
HUNGARY
2
1

English (GB)
6
7. Scope of ATEX categories for NK, NKG pumps
Note: The link between groups, categories and zones is
explained in the 1999/92/EC directive. Please note that this is a
minimum directive. Some EU countries might therefore have
stricter local rules. The user or installer is always responsible for
checking that the group and category of the pump correspond to
the zone classification of the installation site.
8. Installation
8.1 Pump with single seal
8.1.1 Non-flammable liquids
Category 2G/D
If the operator cannot ensure that the pump is filled with pumped
liquid during operation, appropriate monitoring, e.g. dry-running
protection, is required to stop the pump in case of malfunction.
Category 3G/D
No additional monitoring (dry-running protection) is required for
the pump system.
8.1.2 Flammable liquids
Category 2G and 3G
If the operator cannot ensure that the pump is filled with pumped
liquid during operation, appropriate monitoring, e.g. dry-running
protection, is required to stop the pump in case of malfunction.
Sufficient ventilation around the pump is also required.
The leakage rate of a normally working shaft seal is less than
36 ml for each 24 hours of operation. Ensure proper ventilation to
maintain the zone classification stated.
8.2 Pump with double seal (back-to-back or tandem)
8.2.1 Non-flammable liquids - pump unit
Category 2G/D
If the operator cannot ensure that the pump is filled with pumped
liquid during operation, appropriate monitoring, e.g. dry-running
protection, is required to stop the pump in case of malfunction.
Category 3G/D
No additional monitoring (dry-running protection) is required for
the pump system.
8.2.2 Non-flammable liquids - auxiliary unit
Dead-end solutions - category 2G/D and 3G/D
Ensure correct flow rate, pressure and temperature of the barrier
or flushing liquid. See section 8.3 Barrier or flushing liquid
connections of dead-end solutions for connection of barrier or
flushing liquid. See also installation and operating instructions
mentioned in section 3. Related installation and operating
instructions.
No additional monitoring, e.g. dry-running protection, is required
for the auxiliary unit.
Circulating solutions - category 2G/D and 3G/D
Ensure correct flow rate, pressure and temperature of the barrier
or flushing liquid. See installation and operating instructions
mentioned in section 3. Related installation and operating
instructions.
The auxiliary unit requires additional monitoring, e.g. dry-running
protection, to ensure supply of barrier or flushing liquid.
8.2.3 Flammable liquids - pump unit
Category 2G and 3G
If the operator cannot ensure that the pump is filled with pumped
liquid during operation, appropriate monitoring, e.g. dry-running
protection, is required to stop the pump in case of malfunction.
Sufficient ventilation around the pump is also required.
The leakage rate of a normally working shaft seal is less than
36 ml for each 24 hours of operation. Ensure proper ventilation to
maintain the zone classification stated.
8.2.4 Flammable liquids - auxiliary unit
Dead-end solutions - category 2G and 3G
Ensure correct flow rate, pressure and temperature of the barrier
or flushing liquid. See section 8.3 Barrier or flushing liquid
connections of dead-end solutions for connection of barrier or
flushing liquid. See also installation and operating instructions
mentioned in section 3. Related installation and operating
instructions.
No additional monitoring (dry-running protection) is required for
the auxiliary unit.
Circulating solutions - category 2G and 3G
Ensure correct flow rate, pressure and temperature of the barrier
or flushing liquid. See installation and operating instructions
mentioned in section 3. Related installation and operating
instructions.
Directive ATEX-approved NK, NKG pumps
94/9/EC Group I Group II Category M Category 1 Category 2 Category 3
12GD G D G D
1999/92/EC Zone 0 Zone 20 Zone 1 Zone 21 Zone 2 Zone 22
Pumps NoneNoneNoneNone NK
NKG NK NKG NK NKG NK NKG
Motors None None None None
2G EEx e II T3
2G EEx d IIB T4
2G EEx d IIC T4
2G EEx de IIB T4
2G EEx de IIC T4
2D 125 °C
EExnA 3G T3
2G EEx e II T3
2G EEx d IIB T4
2G EEx d IIC T4
2G EEx de IIB T4
2G EEx de IIC T4
3D 125 °C
Warning
Make sure that the pump is filled with pumped
liquid during operation.

English (GB)
7
The auxiliary unit requires additional monitoring, e.g. dry-running
protection, to ensure supply of barrier or flushing liquid.
8.3 Barrier or flushing liquid connections of dead-end
solutions
Fig. 2 Examples of double seal arrangements with dead-end
solutions
Fig. 3 Pipe connections
8.4 Checking the direction of rotation
8.5 Pit installation
8.6 Bypass with pressure-relief valve
8.7 Monitoring of bearing condition
Heavy-duty bearings are prepared for vibration measurement by
means of the shock pulse method (SPM). The bearing brackets
have also tappings for Pt100 temperature sensors for continuous
monitoring of the bearing condition.
8.8 Earthing of pump housing
Fig. 4 Earthing point of pump housing.
Tighten to 80 ± 16 Nm.
9. Operating conditions
9.1 Maximum liquid temperature
The maximum liquid temperature depends on the temperature
class specified by customer and the shaft seal.
The illustration below shows the maximum surface temperature
of the pump as a result of maximum liquid temperature and
temperature rise in the shaft seal.
Fig. 5 Calculation of maximum surface temperature
The maximum surface temperature of the pump must be at least
5 °C lower than the maximum surface temperature of the
temperature class specified by the customer.
The maximum liquid temperature and the temperature class
specified by the customer are stated on the "key application data
sheet" supplied with the pump. See the example at the end of this
booklet.
A copy is filed by Grundfos and can be traced by means of the
product number and serial numbers on the pump nameplate.
Warning
The responsibility for checking the functions of
the dry-running protection, such as flow rate,
sealing pressure and temperature of the barrier
or flushing liquid rests with the installer/owner.
TM04 9576 4610 TM04 9576 4610
Warning
The barrier or the flushing liquid must be
connected to pipe connection number 2 for the
examples in fig. 2. Pipe connections 1 and 3 must
be plugged. See fig. 3.
TM04 9576 4610
Warning
Never check the direction of rotation by starting
the pump - not even for a short period - unless
the pump and auxiliary unit have been filled with
liquid. This is to prevent temperature rises
resulting from contact between rotating and
stationary components, and to protect the shaft
seal against dry-running.
Warning
Provide adequate ventilation if the pump is
installed in a pit.
Warning
Operation against a closed discharge valve or a
shut-off element may cause overheating and is
not allowed. This can be avoided by installing a
bypass with a pressure-relief valve. Observe the
minimum flow rate. See section 3. Related
installation and operating instructions.
2
1
3
Warning
The pump housing must be earthed.
TM05 2026 4311
Temperature class Maximum surface temperature
[°C]
T1 450
T2 300
T3 200
T4 135
T5 100
T6 85
TM04 0062 4907
Maximum surface temperature of
the pump
Temperature rise in the shaft seal
(calculated by Grundfos)
Maximum liquid temperature
T [°C]

English (GB)
8
Fig. 6 Model, product number, production site, week and
year, and serial number
9.2 Vacuum operation or suction lift
Fig. 7 Pumps with double seal arrangements connected to
an elevated vessel
If vacuum operation or suction lift is a continuous or periodic
operating condition for the applications shown in fig. 7, use
appropriate level monitoring equipment to ensure flushing liquid
in the seal chamber. The pump must be stopped if the flushing
liquid reaches a specified low level in the supply vessel.
10. Before starting an ATEX-approved pump
1. Check that the ATEX rating on the order corresponds to the
category specified on the motor and pump nameplates.
2. Check that the rubber parts of the pump are as ordered.
See nameplate.
Example:
The key to the nameplate is shown in the installation and
operating instructions for the standard pump.
3. Check that the pump and/or auxiliary units have been filled
with liquid and vented.
4. Check that the shaft can rotate freely.
There must be no mechanical contact between impeller and
pump housing.
5. Check the direction of rotation. The correct direction of
rotation is shown by an arrow on the pump housing.
6. Follow the special start-up procedures for pumps with double
seal (back-to-back or tandem).
See the installation and operating instructions for the pump in
question.
7. If a pump with double seal (back-to-back) has been chosen,
check that the seal chamber is correctly pressurised.
8. Before start and during operation, make sure that the pump
does not leak or has any malfunction.
9. The pump must be re-vented in these cases:
– The pump has been stopped for a period of time.
– Air/gas has accumulated in the pump.
11. Maintenance/inspection
1. Check on a daily basis that shaft seal and auxiliary units
function correctly.
2. Check the lubricant and bearing noise each week. If the
bearings begin to show signs of wear, they must be replaced.
3. Check coupling rubber parts every four weeks. If they begin to
show signs of wear, they must be replaced.
4. Any standby pump installed must be switched on once a week
to keep it operational.
5. The pressurising or the flushing system must be thoroughly
cleaned once a year. Observe the manufacturers instructions
for the auxiliary unit. Take the pump out of operation for this
purpose.
Subject to alterations.
Warning
Do not operate the pump at temperatures
exceeding those specified on the "key
application data sheet". Damage resulting from
disregarding this warning will not be covered by
the Grundfos warranty.
Note
If the data sheet is missing, contact Grundfos for
information about the maximum liquid
temperature.
If the pump is to be operated at a higher liquid
temperature than the one stated on the data
sheet, contact Grundfos.
TM04 4176 1209 TM04 4189 1009
Note
This check list must be strictly observed.
Model B 96029550 P2 0514 0001
NKG 125-100-160 /160-142 H2 F 2 A KE O 2926
Note
This check list must be strictly observed.
It may be overruled by stricter local maintenance
schedules.

Appendix
111
Appendix 1
Example of key application data
sheet
Dear customer, please fill in the following questionnaire in
cooperation with a Grundfos representative. This will help to
ensure that Grundfos supplies you with a pump solution adapted
to meet exactly your needs in terms of pump type, pump
materials, shaft seal arrangement, shaft seal type, elastomers
and accessories.
Customer information
Quotation made by:
Operating conditions
Pumped liquid
Type of liquid: _________________________________________________
Chemical composition (if available): _________________________________________________
Distilled or demineralised water? Yes _____ No ____
Conductivity of distilled/demineralised water _______________________ [μS/cm]
Minimum liquid temperature: _______________________ [°C]
Maximum liquid temperature: _______________________ [°C]
Vapour pressure of liquid: _______________________ [bar]
Liquid concentration: _______________________ %
Liquid pH value: _______________________
Liquid viscosity: Dynamic viscosity: _______________________ [cP] = [mPa·s]
Kinematic viscosity: _______________________ [cSt] = [mm2/s]
Liquid density: _______________________ [kg/m3]
Specific heat capacity of liquid: _______________________ [kJ/(kg·K)]
Air/gas in liquid? Yes _____ No ____
Solids in liquid? Yes _____ No ____
Contents of solids in liquid (if available): _______________________ % of mass
Additives in liquid? Yes _____ No ____
Does the liquid crystallise? Yes _____ No ____
When does crystallisation happen? ________________________________________________
________________________________________________
Does the liquid get sticky when volatiles evaporate from the pumped liquid?
Yes _____ No ____
Description of ’sticky’ circumstances: ________________________________________________
________________________________________________
Is the liquid hazardous/poisonous? Yes _____ No ____
Special measures to be taken into account when dealing with this hazardous/poisonous liquid:
________________________________________________
________________________________________________
________________________________________________
Special measures for handling this liquid: ________________________________________________
Company name: Project title:
Customer number: Reference number:
Phone number: Customer contact:
Fax number:
E-mail address:
Company name: Prepared by:
Phone number: Date: Page 1 of
Fax number: Quotation number;
E-mail address:

Appendix
112
CIP liquid (cleaning in place)
Type of liquid: ________________________________________________
Chemical composition (if available): ________________________________________________ Liquid
Temperature during operation: _______________________ [°C]
Maximum liquid temperature: _______________________ [°C]
Vapour pressure of liquid: _______________________ [bar]
Liquid concentration: _______________________ %
Liquid pH value: _______________________
Pump sizing
Main duty point Q:_______ [m3/h] H:_______ [m]
Max. duty point Q:_______ [m3/h] H:_______ [m]
Min. duty point Q:_______ [m3/h] H:_______ [m]
Ambient operating conditions
Ambient temperature: _______________________ [°C]
Altitude above sea level: _______________________ [m]
Pressure
Minimum inlet pressure: _______________________ [bar]
Maximum inlet pressure: _______________________ [bar]
Discharge pressure (inlet pressure + head): _______________________ [bar]
ATEX marking
Required marking of the pump
Customer’s equipment group (e.g.: II): _______________________
Customer’s equipment category (e.g.: 2, 3) _______________________
Gas (G) and/or dust (D) Gas (G)____Dust (D)____ Gas and dust (G/D)____
Required marking of the motor
Protection type (e.g.: d, de, e, nA) _______________________
Maximum experimental safe gap (e.g.: B, C) _______________________
Temperature class - gas (e.g.: T3, T4, T5) _______________________
- dust (e.g.: 125 °C) _______________________ [°C]
Description/sketch
Detailed description of ATEX application _________________________________________________
(attach a drawing if possible) _________________________________________________
_________________________________________________
ATEX certificate required Yes _____ No ____
Frequency converter
Frequency converter option wanted? Yes _____ No ____
Control parameter: Pressure ___ Temperature ___ Flow ___ Other ___
Detailed description of requirements: _________________________________________________
(attach a drawing if possible) _________________________________________________
_________________________________________________
System information
Please provide us with some information about your system and
maybe a simple sketch. This will give us hints as to whether you
need accessories or monitoring equipment, or whether you
already have a suitable system which makes it unnecessary to
attach any further equipment.

Appendix
113
Double shaft seal solutions
If you chose a tandem or a back-to-back shaft seal solution, you
must connect either a flushing system or pressurizing system for
barrier liquid to the connection pipes.
Tandem shaft seals
Is a flushing liquid available in the application? Yes ____ No ____
Description of the flushing liquid: _________________________________________________
Chemical composition (if available): _________________________________________________
Pressure of the flushing liquid: ____________ ___ [bar ]
Does the application require flushing/cooling of the primary shaft seal?
Yes ____ No ____
Comments on flushing/cooling for the primary shaft seal:
_________________________________________________
_________________________________________________
More comments/info about your system: _________________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
GrA8480 GrA8610
Fig. 1 Flushing connections of tandem shaft seal
arrangement with standard seals Fig. 2 Flushing connections of tandem shaft seal
arrangement with a cartridge seal
Pipe connection to
primary shaft seal. The
liquid is directed to the
seal faces of the shaft
seal. The primary seal is
placed on the pumped
liquid side.
Pipe connections to
secondary shaft seal. The
liquid is directed to the seal
faces of the secondary
shaft seal. The secondary
seal is placed in the seal
chamber.
Pipe connections to the cartridge seal.
The direction of the flushing flow
depends on the direction of rotation of
the shaft