Grundfos NK Series User manual

NK, NKG
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

English (GB)
2
English (GB) Installation and operating instructions
Original installation and operating instructions.
CONTENTS
Page
1. Symbols used in this document
2. General information
NK, NKG are non-self-priming, single stage, centrifugal volute
pumps with axial suction port and radial discharge port.
NK pumps comply with EN 733.
NKG pumps comply with ISO 2858.
3. Receiving the product
3.1 Delivery
The pumps are tested 100 % before leaving the factory. The test
includes a function test where the pump performance is
measured to ensure that the pump meets the requirements of
relevant standards. Test certificates are available from Grundfos.
After the installation, the alignment of pump and motor must be
checked again. See section 7.3 Alignment.
3.2 Transporting the product
Always transport the pump in the specified position. During
transport, the pump must be fastened securely to prevent
damage to the shaft and shaft seal caused by excessive
vibrations and knocks. The pump must not be lifted by the shaft.
1. Symbols used in this document 2
2. General information 2
3. Receiving the product 2
3.1 Delivery 2
3.2 Transporting the product 2
3.3 Handling 3
3.4 Storing the product 3
4. Identification 3
4.1 Nameplate 3
4.2 Type key 4
5. Applications 6
5.1 Pumped liquids 6
6. Operating conditions 7
6.1 Ambient temperature and altitude 7
6.2 Liquid temperature 7
6.3 Maximum operating pressure 7
6.4 Minimum inlet pressure 7
6.5 Maximum inlet pressure 7
6.6 Minimum flow rate 7
6.7 Maximum flow rate 7
6.8 Shaft seals 8
7. Mechanical installation 9
7.1 Pump location 9
7.2 Foundation and grouting of horizontally mounted NK,
NKG pumps with base frame 9
7.3 Alignment 12
7.4 Pipework 15
7.5 Vibration damping 15
7.6 Expansion joints 16
7.7 Stuffing box piping 16
7.8 Bearing bracket 17
7.9 Bearing monitoring 18
7.10 Pressure gauge and mano-vacuum gauge 18
7.11 Ammeter 18
8. Flange forces and torques 19
9. Electrical connection 20
9.1 Motor protection 20
9.2 Frequency converter operation 20
10. Commissioning and startup 20
10.1 General information 20
10.2 Commissioning 20
10.3 Priming 21
10.4 Checking the direction of rotation 21
10.5 Startup 21
10.6 Shaft seal run-in period 22
10.7 Motor start/stop 22
10.8 Reference readings of monitoring equipment 22
11. Maintenance 22
11.1 Pump 22
11.2 Lubrication of bearings in bearing bracket 23
11.3 Monitoring equipment 25
11.4 Motor 25
12. Periods of inactivity and frost protection 25
13. Service 26
13.1 Service kits 26
14. Technical data 26
14.1 Electrical data 26
14.2 Sound pressure level 26
14.3 Belt drive 26
14.4 Operation with combustion engine 26
15. Fault finding 27
16. Disposal 28
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.
Warning
Pay attention to the pump weight, and take
precautions to prevent personal injury if the
pump should topple or fall by accident.

English (GB)
3
3.3 Handling
Lift the pumps by means of nylon straps and shackles.
Fig. 1 Correct lifting of pump
Fig. 2 Incorrect lifting of pump
3.4 Storing the product
The contractor must inspect the equipment on delivery and make
sure that it is stored in such a way that corrosion and damage are
avoided.
If more than six months will pass before the equipment is put into
operation, please consider applying a suitable corrosion inhibitor
to the internal pump parts.
Make sure that the corrosion inhibitor used does not affect the
rubber parts with which it comes into contact.
Make sure that the corrosion inhibitor can be easily removed.
To prevent water, dust, etc. from entering the pump, all openings
must be kept covered until the pipes are fitted. The cost of having
to dismantle the pump during startup to remove foreign objects
can be very high.
4. Identification
4.1 Nameplate
Fig. 3 Example of NKG nameplate
Legend
Warning
Motors from 4 kW and up are supplied with lifting
eyes which must not be used for lifting the entire
pump unit.
TM03 3948 1206TM03 3769 1006
TM05 6007 1215
Pos. Description
1 Type designation
2 Model
3 Rated flow
4 Pressure rating or maximum temperature
5 Country of origin
6 Rated speed
7 Pump head
8 Minimum efficiency index
9Hydraulic pump efficiency at optimum efficiency
point
bar/°C MAX
m /h
3H
Q
p/t
mnmin-1
Model
96145329
Type
Made in Hungary
6
7
1
2
3
4
5
%
DK-8850 Bjerringbro, Denmark
89
0(, p
Ș
NKG 200-150-200/210-170 H2 F 3 N KE O 2926
B 98051910 P2 0512 0001
225.5 2.8 960
25/120 0.70 77.1

English (GB)
4
4.2 Type key
Model B
Example 1, pump design according to EN 733 NK 32 -125 .1 /142 A1 F 1 A E S BAQE
Example 2, pump design according to ISO 2858 NKG 200 -150 -200 /210-170 H2 F 3 N KE O2926
Type range
Nominal diameter of suction port (DN)
Nominal diameter of discharge port (DN)
Nominal impeller diameter [mm]
Reduced performance: .1
Actual impeller diameter [mm]
Code for pump version; the codes may be combined
A1 Basic version, grease-lubricated standard bearing design, standard coupling
A2 Basic version, grease-lubricated standard bearing design, spacer coupling
BOversizemotor
EWithATEX approval, certificate or test report, the second character of the pump version code is an E
G1 Grease-lubricated heavy-duty bearing design, standard coupling
G2 Grease-lubricated heavy-duty bearing design, spacer coupling
H1 Oil-lubricated heavy-duty bearing design, standard coupling
H2 Oil-lubricated heavy-duty bearing design, spacer coupling
I1 Pump without motor, grease-lubricated standard bearing design, standard coupling
I2 Pump without motor, grease-lubricated standard bearing design, spacer coupling
J1 Pump without motor, grease-lubricated heavy-duty bearing design, standard coupling
J2 Pump without motor, grease-lubricated heavy-duty bearing design, spacer coupling
K1 Pump without motor, oil-lubricated heavy-duty bearing design, standard coupling
K2 Pump without motor, oil-lubricated heavy-duty bearing design, spacer coupling
Y1 Bare shaft pump, grease-lubricated standard bearing design
W1 Bare shaft pump, grease-lubricated heavy-duty bearing design
Z1 Bare shaft pump, oil-lubricated heavy-duty bearing design
X Special version; used in case of further customisation than already listed
Pipe connection
E Table E flange
F DIN flange
G ANSI flange
J JIS flange
Flange pressure rating (PN - rated pressure)
1 10 bar
2 16 bar
3 25 bar
4 40 bar
5 Other pressure rating
Materials
Pump housing Impeller Wear ring Shaft
A EN-GJL-250 EN-GJL-200 Bronze/brass 1.4021/1.4034
B EN-GJL-250 Bronze CuSn10 Bronze/brass 1.4021/1.4034
C EN-GJL-250 EN-GJL-200 Bronze/brass 1.4401
D EN-GJL-250 Bronze CuSn10 Bronze/brass 1.4401
E EN-GJL-250 EN-GJL-200 EN-GJL-250 1.4021/1.4034
F EN-GJL-250 Bronze CuSn10 EN-GJL-250 1.4021/1.4034
G EN-GJL-250 EN-GJL-200 EN-GJL-250 1.4401
H EN-GJL-250 Bronze CuSn10 EN-GJL-250 1.4401
I 1.4408 1.4408 1.4517 1.4462
J 1.4408 1.4408 Carbon-graphite-filled
PTFE (Graflon®)1.4462
K 1.4408 1.4408 1.4517 1.4401
L 1.4517 1.4517 1.4517 1.4462
M 1.4408 1.4517 1.4517 1.4401
N 1.4408 1.4408 Carbon-graphite-filled
PTFE (Graflon®)1.4401

English (GB)
5
Example 1 shows an NK 32-125.1 pump with these
characteristics:
Example 2 shows an NKG 200-150-200 pump with these
characteristics:
P 1.4408 1.4517 Carbon-graphite-filled
PTFE (Graflon®)1.4401
R 1.4517 1.4517 Carbon-graphite-filled
PTFE (Graflon®)1.4462
S EN-GJL-250 1.4408 Bronze/brass 1.4401
T EN-GJL-250 1.4517 Bronze/brass 1.4462
U 1.4408 1.4517 1.4517 1.4462
W 1.4408 1.4517 Carbon-graphite-filled
PTFE (Graflon®)1.4462
X Special version
Rubber parts in pump
The first letter indicates material of O-rings for pump cover and seal cover. O-ring for seal cover is only for double seal
arrangements
The second letter indicates material of O-ring for seal housing. O-ring for seal housing is only for double seal arrangements
EEPDM
F FXM (Fluoraz®)
K FFKM (Kalrez®)
M FEPS (PTFE-sheathed silicone O-ring)
VFKM(Viton
®)
XHNBR
Shaft seal arrangement
B Stuffing box
C Cartridge seal, single
D Cartridge seal, double
O Back-to-back, double seal
P Tandem, double seal
S Single seal
Shaft seal(s) in pump
Letter or digit code for mechanical shaft seal and shaft seal rubber parts
4 letters: Single mechanical shaft seal, such as BQQE, or single cartridge seal, such as HBQV
4 digits: Double seal solution; example 2716, where 27 is DQQV, primary seal, and 16 is BQQV, secondary seal;
double cartridge seal; example 5150, where 51 is HQQU, primary seal, and 50 is HBQV, secondary seal
The relation between letters and digits of the shaft seals is described on page 6.
Example 1, pump design according to EN 733 NK 32 -125 .1 /142 A1 F 1 A E S BAQE
Example 2, pump design according to ISO 2858 NKG 200 -150 -200 /210-170 H2 F 3 N KE O2926
• reduced performance
• 142 mm impeller
• grease-lubricated standard bearing design
• standard coupling
• DIN flange to EN 1092-2 pipework connection
• 10 bar flange pressure rating
• cast iron pump housing, EN-GJL-250
• cast iron impeller, EN-GJL-200
• bronze/brass wear ring
• stainless steel shaft, EN 1.4021/1.4034
• EPDM O-ring for pump cover
• single shaft seal arrangement
• BAQE shaft seal
• 210-170 mm conical impeller
• grease-lubricated heavy-duty bearing design
• spacer coupling
• DIN flange to EN 1092-2 pipework connection
• 25 bar flange pressure rating
• stainless steel pump housing, EN 1.4408
• stainless steel impeller, EN 1.4408
• carbon-graphite-filled PTFE (Graflon®) wear ring
• stainless steel shaft, EN 1.4401
• FFKM O-rings for pump cover and seal cover
• EPDM O-ring for seal housing
• back-to-back double shaft seal arrangement
• primary shaft seal: DQQK
• secondary shaft seal: DQQE

English (GB)
6
4.2.1 Codes for shaft seals
The digits are only used for double shaft seal solutions.
4.2.2 Letter codes for shaft seals
For a thorough description of shaft seal types and materials, see
the data booklet "NB, NBG, NK, NKG, NBE, NBGE, NKE, NKGE -
Custom-built pumps according to EN 733 and ISO 2858".
4.2.3 Letter codes for stuffing boxes
For a thorough description of stuffing boxes and materials, see
the data booklet "NB, NBG, NK, NKG, NBE, NBGE, NKE, NKGE -
Custom-built pumps according to EN 733 and ISO 2858".
5. Applications
5.1 Pumped liquids
Clean, thin, non-explosive liquids without solid particles or fibres.
The pumped liquid must not attack the pump materials
chemically.
Digits Letters Description
10 BAQE Single mechanical shaft seal
11 BAQV Single mechanical shaft seal
12 BBQE Single mechanical shaft seal
13 BBQV Single mechanical shaft seal
14 BQBE Single mechanical shaft seal
15 BQQE Single mechanical shaft seal
16 BQQV Single mechanical shaft seal
17 GQQE Single mechanical shaft seal
18 GQQV Single mechanical shaft seal
19 AQAE Single mechanical shaft seal
20 AQAV Single mechanical shaft seal
21 AQQE Single mechanical shaft seal
22 AQQV Single mechanical shaft seal
23 AQQX Single mechanical shaft seal
24 AQQK Single mechanical shaft seal
25 DAQF Single mechanical shaft seal
26 DQQE Single mechanical shaft seal
27 DQQV Single mechanical shaft seal
28 DQQX Single mechanical shaft seal
29 DQQK Single mechanical shaft seal
50 HBQV Cartridge seal
51 HQQU Cartridge seal
52 HAQK Cartridge seal
SNEA Stuffing box
SNEB Stuffing box
SNEC Stuffing box
SNED Stuffing box
SNOA Stuffing box
SNOB Stuffing box
SNOC Stuffing box
SNOD Stuffing box
SNFA Stuffing box
SNFB Stuffing box
SNFC Stuffing box
SNFD Stuffing box
Example: 10 is BAQE B A Q E
Shaft seal type
A O-ring seal with fixed driver
B Rubber bellows seal
D O-ring seal, balanced
GBellows seal, type B, with reduced
seal faces
H Cartridge seal, balanced
Material, rotating seal face
ACarbon, metal-impregnated with antimony
which is not approved for potable water
B Carbon, resin-impregnated
Q Silicon carbide
Material, stationary seat
ACarbon, metal-impregnated with antimony which
is not approved for potable water
B Carbon, resin-impregnated
Q Silicon carbide
Material, secondary seal and other rubber and
composite parts, except the wear ring
EEPDM
VFKM(Viton
®)
F FXM (Fluoraz®)
K FFKM (Kalrez®)
X HNBR
U Dynamic O-rings in FFKM and static O-rings in PTFE
Example: S N E A
Stuffing box type
S Packing type stuffing box
Cooling method
N Uncooled stuffing box
Barrier liquid
E With internal barrier liquid
F With external barrier liquid
O Without barrier liquid
Material
APTFE-impregnated fibre packing rings (Buraflon®) and
EPDM O-rings in the pump housing
BGraphite-PTFE compound packing rings
(Thermoflon®) and EPDM O-ring in the pump housing
CPTFE-impregnated fibre packing rings (Buraflon®) and
FKM O-ring in the pump housing
DGraphite-PTFE compound packing rings
(Thermoflon®) and FKM O-ring in the pump housing
Example: 10 is BAQE B A Q E

English (GB)
7
6. Operating conditions
6.1 Ambient temperature and altitude
The ambient temperature and the installation altitude are
important factors for the motor life as they affect the life of the
bearings and the insulation system.
If the ambient temperature exceeds the recommended maximum
ambient temperature or the installation altitude exceeds the
recommended maximum altitude above sea level, see fig. 4, the
motor must not be fully loaded due to the low density and
consequently low cooling effect of the air. In such cases, it may
be necessary to use a motor with a higher output.
Fig. 4 The maximum motor output depends on the ambient
temperature and altitude
Legend
Example: A pump with a 1.1 kW IE2 MG motor: If this pump is
installed 4750 m above sea level, the motor must not be loaded
more than 88 % of the rated output. At an ambient temperature of
75 °C, the motor must not be loaded more than 78 % of the rated
output. If the pump is installed 4750 m above sea level at an
ambient temperature of 75 °C, the motor must not be loaded
more than 88 % x 78 % equal to 68.6 % of the rated output.
6.2 Liquid temperature
-40 - +140 °C.
The maximum liquid temperature is stated on the pump
nameplate. It depends on the shaft seal chosen.
For EN-GJL-250 cast iron pump housings, local regulations may
not allow liquid temperatures above +120 °C.
6.3 Maximum operating pressure
Fig. 5 Pressures in the pump
The inlet pressure + the pump pressure must be lower than the
maximum operating pressure stated on the pump nameplate.
Operation against a closed discharge valve gives the highest
operating pressure.
6.4 Minimum inlet pressure
Pay attention to the minimum inlet pressure to avoid cavitation.
The risk of cavitation is higher in the following situations:
• The liquid temperature is high.
• The flow rate is considerably higher than the pump's rated flow
rate.
• The pump is operating in an open system with suction lift.
• The liquid is sucked through long pipes.
• The inlet conditions are poor.
• The operating pressure is low.
6.5 Maximum inlet pressure
The inlet pressure + the pump pressure must be lower than the
maximum operating pressure stated on the pump nameplate.
Operation against a closed discharge valve gives the highest
operating pressure.
6.6 Minimum flow rate
The pump must not run against a closed discharge valve as this
will cause an increase in temperature/formation of steam in the
pump. This may cause shaft damage, impeller erosion, short life
of bearings and damage to stuffing boxes or mechanical shaft
seals due to stress or vibration. The continuous flow rate must be
at least 10 % of the rated flow rate. The rated flow rate is stated
on the pump nameplate.
6.7 Maximum flow rate
The maximum flow rate must not be exceeded as otherwise there
is a risk of for instance cavitation and overload.
The minimum and maximum flow rates can be read either from
the performance curve pages in the relevant data booklets or
from a curve for a specific pump when selecting it in Grundfos
Product Center.
Fig. 6 Example from Grundfos Product Center showing
minimum and maximum flow rate
TM04 4914 2209
Pos. Description
1 0.25 - 0.55 kW MG motors
20.75 - 22 kW MG motors, IE2/IE3
0.75 - 450 kW MMG-H motors, IE2
3 0.75 - 462 kW Siemens motors, IE2
TM04 0062 4907
20 25 30 35 40 45 50 55 60 65 70 75 80
50
60
70
80
90
100
[%]
P2
1
2
3
t[°C]
1000 2250 3500 4750 m
Inlet pressure
Pump pressure
Maximum operating pressure, i.e. pressure
above atmospheric pressure
TM05 2444 5111
Minimum flow rate
Maximum flow rate

English (GB)
8
6.8 Shaft seals
Mechanical shaft seals
Stuffing box
The operating range of the seals is described for two main
applications: pumping of water or pumping of coolants.
Seals with a temperature range of 0 °C and up are mainly used for
pumping water, while seals for temperatures below 0 °C are mainly
intended for coolants.
Note: We do not recommend operation at maximum temperature
and maximum pressure at the same time as the seal life will be
reduced and periodical noise will occur.
Shaft seal diameter [mm] 28, 38 48 55 60
d5 [mm] 24, 32 42 48 60
Shaft seal type Seal
faces Rubber Code Temperature
range Max. pressure [bar]
Bellows seal, type B, unbalanced
AQ1EPDM BAQE 0-120 °C 16 16 16 16
AQ1FKM BAQV 0-90 °C 16 16 16 16
BQ1EPDM BBQE 0-120 °C 16 16 16 16
BQ1FKM BBQV 0-90 °C 16 16 16 16
Q1B EPDM BQBE 0-100 °C 16 - - -
Q7Q7EPDM BQQE -25 - +110 °C 16 16 16 16
Q7Q7FKM BQQV -10 - +90 °C 16 16 16 16
Bellow seal, type B, unbalanced
with reduced seal faces
Q1Q1EPDM GQQE -25 - +60 °C 16 16 16 16
Q1Q1FKM GQQV -10 - +60 °C 16 16 16 16
O-ring seal, type A, unbalanced
Q1A EPDM AQAE 0-120 °C 16 16 16 16
Q1A FKM AQAV 0-90 °C 16 16 16 16
Q1Q1EPDM AQQE -25 - +90 °C 16 16 16 16
Q1Q1FKM AQQV -10 - +90 °C 16 16 16 16
Q1Q1HNBR AQQX -15 - +90 °C 16 16 16 16
Q1Q1FFKM AQQK 0-90 °C 16 16 16 16
O-ring seal, type D, balanced
AQ1FXM DAQF 0-140 °C 25 25 25 25
Q6Q6EPDM DQQE -20 - +120 °C 25 25 25 25
Q6Q6FKM DQQV -10 - +90 °C 25 25 25 25
Q6Q6HNBR DQQX -15 - +120 °C 25 25 25 25
Q6Q6FFKM DQQK 0-120 °C 25 25 25 25
Code Temperature range Max. pressure [bar]
Stuffing box without cooling, with internal barrier liquid
Stuffing box without cooling, without barrier liquid
Stuffing box without cooling, with external barrier liquid
SNE
SNO
SNF
-30 - +120 °C 16

English (GB)
9
7. Mechanical installation
7.1 Pump location
The pump must be sited in a well-ventilated, but frost-free
location.
For inspection and repair, allow suitable clearances for pump or
motor removal.
• Pumps fitted with motors up to and including 4 kW require a
0.3 m clearance behind the motor.
• Pumps fitted with motors of 5.5 kW and up require a 0.3 m
clearance behind the motor and at least a 1 m clearance
above the motor to allow the use of lifting equipment.
Fig. 7 Clearance behind the motor
7.2 Foundation and grouting of horizontally mounted
NK, NKG pumps with base frame
We recommend that you install the pump on a plane and rigid
concrete foundation which is heavy enough to provide permanent
support for the entire pump. The foundation must be capable of
absorbing any vibration, normal strain or shock. As a rule of
thumb, the weight of the concrete foundation must be 1.5 times
the weight of the pump.
The foundation must be 100 mm larger than the base frame on all
four sides. See fig. 8.
Fig. 8 Foundation, X equal to minimum 100 mm
The minimum height of the foundation, hf, can then be calculated:
The density, δ, of concrete is usually taken as 2,200 kg/m3.
Place the pump on the foundation, and fasten it. The base frame
must be supported under its entire area. See fig. 9.
Fig. 9 Correct foundation
Fig. 10 Incorrect foundation
Fig. 11 Base frame with pouring holes
It is important to prepare a good foundation prior to the
installation of the pump.
NK, NKG pumps with base frame are always prepared for
grouting.
For NK, NKG pumps with 2-pole motors equal to or bigger than
55 kW, grouting of the base frame is mandatory in order to
prevent vibration energy from the rotating motor and liquid flow to
evolve.
Warning
When pumping hot or cold liquids, make sure that
persons cannot accidentally come into contact
with hot or cold surfaces.
TM05 3727 1612TM03 3771 1206
0.3 m
0.25 - 4 kW
5.5 kW and up
1 m
0.3 m
hf=mpump ×1.5
Lf×Bf×δconcrete
TM03 3950 1206TM03 4324 1206TM03 4587 2206
P2 lower than or
equal to 45 kW P2 equal to or higher than 55 kW
2-pole Grouting optional Grouting mandatory
4-pole Grouting optional
6-pole Grouting optional

English (GB)
10
7.2.1 Procedure
1. Preparing the foundation
2. Levelling of the base frame
3. Preliminary alignment
4. Grouting
5. Final alignment according to section 7.3 Alignment.
1: Preparing the foundation
We recommend the following procedure to ensure a good foundation.
2: Levelling of the base frame
Step Action Illustration
1
Use an approved, non-shrinking concrete. Contact your
concrete supplier for advice if any doubts.
Pour the foundation without interruptions to within 19 to
32 mm of the final level. Use vibrators to ensure that the
concrete is evenly distributed. The top surface must be
well scored and grooved before the concrete sets. This
provides a bonding surface for the grout.
2
Embed foundation bolts in the concrete. Allow enough
bolt length to reach through grout, shims, lower base
frame, nuts and washers.
TM03 0190 4707
3Let the foundation cure for several days before the base
frame is levelled and grouted.
5-10 mm
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Bolt length
above base
frame
Thickness of
base frame
19-32 mm
allowance for
grout
Base frame
Top of foundation
left rough
Pipe sleeve
Lug
Washer
Wedges and
shims left in
place
Step Action Illustration
1
Lift/jack up the base frame to the final level 19-32 mm
above the concrete foundation, and support the base
frame by means of blocks and shims both at the
foundation bolts and midway between bolts.
TM04 0489 0708
2Level the base frame by adding or removing shims under
the base frame.
TM04 0489 0708
3
Tighten the foundation bolt nuts against the base frame.
Make sure the piping can be aligned to the pump flanges
without putting strain on pipes or flanges.

English (GB)
11
3: Preliminary alignment
The pump and motor are pre-aligned on the base frame from the
factory. Some deformation of the base frame may occur during
transport and it is therefore essential to check the alignment at
the installation site prior to final grouting.
A flexible coupling will only compensate for minor misalignments
and must not be used to compensate for excessive misalignment
of the pump and motor shafts. Inaccurate alignment results in
vibration and excessive wear on the bearings, shaft or wear rings.
Carry out alignment of the motor by placing shims of different
thickness under the motor. If possible, replace several thin shims
with one thick shim.
See section 7.3 Alignment.
4: Grouting
Grouting compensates for an uneven foundation, distributes the
weight of the unit, dampens vibrations and prevents shifting. Use
an approved, non-shrinking grout. If you have questions or
doubts about the grouting, please contact an expert on grouting.
Warning
Before starting work on the pump, make sure that
the power supply has been switched off and
cannot be accidentally switched on again.
Warning
Carry out alignment of the motor only, as pipe
strain will occur if the pump is shifted.
Step Action Illustration
1
Embed reinforcing steel bars into the foundation by means
of 2K anchor adhesive glue.
The number of steel bars depends on the size of the base
frame, but it is advisable to distribute a minimum of 20 bars
evenly over the whole area of the base frame. The free end
of the steel bar must be 2/3 the height of the base frame to
ensure a proper grouting.
TM04 0490 0708 - TM04 0491 0708
2Soak top of concrete foundation thoroughly, then remove
surface water.
3 Ensure proper shuttering at both ends of the base frame.
TM03 4590 2206
4
If necessary, check the levelling of the base frame again
before grouting. Pour non-shrinking grout through the
openings of the base frame until the space underneath the
base frame has been filled completely.
Fill the formwork with grout up to the base frame top level.
Allow the grout to dry thoroughly before attaching piping to
the pump. 24 hours is sufficient time with approved
grouting procedure.
When the grout has thoroughly hardened, check the
foundation bolt nuts, and tighten, if necessary.
Approximately two weeks after the grout has been poured,
or when the grout has thoroughly dried, apply an oil-based
paint to the exposed edges of the grout to prevent the grout
from getting into contact with air and moisture.
TM03 2946 4707
Minimum 20 bars
Shuttering
5-10 mm
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Base frame
Grout
Levelling
wedges or shims
left in place
Top of foundation
- rough
19-32 mm
grout
Formwork

English (GB)
12
7.3 Alignment
7.3.1 General information
When a complete unit is supplied assembled from the factory, the
coupling halves have been accurately aligned by means of foil
inserted under the pump and motor mounting surfaces as
required.
As the pump/motor alignment may be affected during transport
and installation, it must always be checked again before starting
the pump.
It is important to check the final alignment when the pump has
obtained its operating temperature under normal operating
conditions.
7.3.2 How to align the unit
It is very important that the pump/motor alignment is carried out
correctly. Follow the procedure below.
The values for ∅and S2 can be found in the following table. The
value for S1 is 0.2 mm.
Fig. 12 Alignment
Aligning the pump and motor with a straight-edge ruler
TM01 8753 0800
90 °
90 °
90 °
90 °
∅
S2
S1
Step Action
1
TM03 8340 1007
Make a rough alignment
of pump and motor, and
tighten the screws in the
base frame to the
correct torque. See the
table Tightening torques
on page 15.
2
TM03 8301 1007
Make a mark on the
coupling, for instance
with a marker pen.
3
TM03 8300 1007
Hold a straight-edge
ruler against the
coupling, and determine
the inaccuracy, if any,
with a feeler gauge.
4
TM03 8302 1007
Turn the coupling 90 °,
and repeat the
measurement with
straight-edge and feeler
gauge. If the measured
values are less than 0.2
mm, the alignment is
complete. Go to step 8.
5
TM03 8321 1007
Adjust the position of
the motor. Loosen the
screws that hold the
motor in place.
6
TM03 8322 1007
Insert shims with the
required thickness.
7
TM03 8324 1007
Tighten the screws to
the correct torque. Go to
step 3, and check the
alignment once more.
8
TM03 8325 1007
Check the gap S2 both
vertically and
horizontally. See the
table Air-gap width S2
on page 15. If the air-
gap width is within the
tolerances, the
alignment is complete. If
not, go to step 6.
Step Action

English (GB)
13
Aligning the pump and motor with laser equipment
Step Action
9
TM03 8340 1007
Make a rough alignment
of pump and motor, and
tighten the screws in the
base frame to the
correct torque. See the
table Tightening torques
on page 15.
10
TM03 8303 1007
Fasten one laser
bracket to the pump
coupling.
11
TM03 8304 1007
Fasten the other laser
bracket to the motor
coupling.
12
TM03 8305 1007
Place laser unit S,
stationary, on the
stationary part and laser
unit M, movable, on the
movable part.
13
TM03 8306 1007
Interconnect the laser
units, and connect one
laser unit to the control
box.
14
TM03 8307 1007
Make sure that the laser
units are at the same
height.
15
TM03 8309 1007
Measure the distance
between the white lines
on the laser units.
16
TM03 8308 1007
Enter the distance.
17
TM03 8310 1007
Measure the distance
between the S unit and
the centre of the gap
between the couplings.
18
TM03 8311 1007
Enter the distance.
19
TM03 8312 1007
Measure the distance
from the S unit to the
first screw on the motor.
20
TM03 8313 1007
Enter the distance.
Step Action

English (GB)
14
21
TM03 8314 1007
Measure the distance
from the S unit to the
rear screw on the motor.
22
TM03 8315 1007
The control box shows
that the laser units must
be turned to position 9
o'clock.
23
TM03 8316 1007
Turn the laser units to
position 9 o'clock.
24
TM03 8319 1007
Confirm on the control
box.
25
TM03 8317 1007
Turn the laser units to
position 12 o'clock.
Confirm on the control
box.
26
TM03 8318 1007
Turn the laser units to
position 3 o'clock.
Confirm on the control
box.
Step Action
27
TM03 8320 1007
If the measured values
are less than 0.1 mm,
the alignment is
complete. Go to step 32.
28
TM03 8321 1007
Adjust the position of
the motor. Loosen the
screws that hold the
motor in place.
29
TM03 8322 1007
Insert shims with the
required thickness.
30
TM03 8324 1007
Tighten the screws to
the correct torque again.
31
TM03 8320 1007
Repeat the alignment
until the values are
within the tolerances.
Go to step 22.
32
TM03 8325 1007
Check the gap S2. See
the table Air-gap width
S2 on page 15.
Step Action

English (GB)
15
Tightening torques
Air-gap width S2
If the coupling and motor are not supplied by Grundfos, make
sure to follow the coupling manufacturer's instructions.
7.4 Pipework
7.4.1 Piping
When installing the pipes, make sure that the pump housing is
not stressed by the pipework.
The suction and discharge pipes must be of an adequate size,
taking the pump inlet pressure into account.
Install the pipes so that air locks are avoided, especially on the
suction side of the pump.
Fig. 13 Pipelines
Fit isolating valves on either side of the pump to avoid having to
drain the system if the pump needs to be cleaned or repaired.
Make sure the pipes are adequately supported as close to the
pump as possible, both on the suction and the discharge side.
The counter-flanges must lie true against the pump flanges
without being stressed as stress would cause damage to the
pump.
Fig. 14 Pipeline mounting
7.4.2 Bypass
If there is any danger of the pump running against a closed
discharge valve, ensure a minimum liquid flow through the pump
by connecting a bypass or drain to the discharge pipe. The
minimum flow rate must be at least 10 % of the maximum flow
rate. The flow rate and head are stated on the pump nameplate.
7.5 Vibration damping
7.5.1 Elimination of noise and vibrations
In order to achieve optimum operation and minimum noise and
vibration, consider vibration damping of the pump. Generally,
always consider this for pumps with motors of 11 kW and up.
Vibration damping is mandatory for motors of 90 kW and up.
Smaller motor sizes, however, may also cause undesirable noise
and vibration.
Noise and vibration are generated by the revolutions of the motor
and pump and by the flow in pipes and fittings. The effect on the
environment is subjective and depends on correct installation and
the state of the rest of the system.
Elimination of noise and vibrations is best achieved by means of
a concrete foundation, vibration dampers and expansion joints.
See fig. 14.
7.5.2 Vibration dampers
To prevent the transmission of vibrations to buildings, we
recommend isolating the pump foundation from building parts by
means of vibration dampers.
The selection of the right vibration damper requires the following
data:
• forces transmitted through the damper
• motor speed, taking speed control, if any, into consideration
• required damping in % - suggested value is 70 %.
The selection of vibration damper differs from installation to
installation. In certain cases, a wrong damper may increase the
vibration level. Vibration dampers must therefore be sized by the
supplier of the vibration dampers.
If you install the pump on a foundation with vibration dampers,
always fit expansion joints on the pump flanges. This is important
to prevent the pump from "hanging" in the flanges.
Description Dimensions Tightening torque
[Nm]
Hexagon head
screw
M6 10 ± 2
M8 12 ± 2.4
M10 23 ± 4.6
M12 40 ± 8
M16 80 ± 16
M20 120 ± 24
M24 120 ± 24
Outside
coupling
diameter
[mm]
Air-gap width S2
[mm]
Standard coupling Spacer coupling
Nominal Tolerance Nominal Tolerance
80 - - 4 0/-1
95 - - 4 0/-1
110 - - 4 0/-1
125 4 0/-1 4 0/-1
140 4 0/-1 4 0/-1
160 4 0/-1 4 0/-1
200 4 0/-1 6 0/-1
225 4 0/-1 6 0/-1
250 4 0/-1 8 0/-1
Note
Measure S2 all the way around the coupling. The
maximum permissible deviation between the
largest and the smallest measurement is 0.2 mm.
Warning
The coupling guard must always be fitted during
operation.
TM00 2263 3393
TM05 3488 1412.
Warning
The pump is not allowed to run against a closed
valve as this will cause an increase in
temperature/formation of steam in the pump
which may cause damage to the pump.
ttttttt tttt tttttttt ttttt tttt tttt tttt tttt tttt tttt tttt tttt tttt ttttt tttt tttt tttt tttt tttt tttt tttt tttt tttt ttttt tttt tttt tttt tttt tttt tttt tttt tttt tttt tttt ttttt tttt tttt

English (GB)
16
7.6 Expansion joints
Expansion joints provide these advantages:
• absorption of thermal expansion and contraction of pipework
caused by variations in liquid temperature
• reduction of mechanical influences in connection with
pressure surges in the pipework
• isolation of structure-borne noise in the pipework; this applies
only to rubber bellows expansion joints.
The expansion joints must be fitted at a minimum distance of 1 to
1 1/2 pipe diameters away from the pump on the suction and the
discharge side. This prevents turbulence in the joints, thus
ensuring optimum suction conditions and minimum pressure loss
on the discharge side. At flow velocities greater than 5 m/s, we
recommend fitting larger expansion joints matching the pipework.
Figures 15 and 16 show examples of rubber bellows expansion
joints with or without limiting rods.
Fig. 15 Rubber bellows expansion joint with limiting rods
Fig. 16 Rubber bellows expansion joint without limiting rods
Expansion joints with limiting rods can be used to reduce the
effects of the expansion/contraction forces on the pipework. We
always recommend expansion joints with limiting rods for flanges
larger than DN 100.
Anchor the pipes in such a way that they do not stress the
expansion joints and the pump. Follow the supplier's instructions
and pass them on to advisers or pipe installers.
Figure 17 shows an example of a metal bellows expansion joint
with limiting rods.
Fig. 17 Metal bellows expansion joint with limiting rods
Due to the risk of rupture of the rubber bellows, metal bellows
expansion joints may be preferred at temperatures above +100
°C combined with high pressure.
7.7 Stuffing box piping
Pumps with stuffing box will always have a continuous leakage
during normal operation. We recommend to connect a drainage
pipe to the drain hole of the bearing bracket, pos. A, G1/2, to
collect the leaking liquid.
For pumps with stuffing box, type SNF, and external barrier liquid,
connect the drain pipe to the hole, pos. B, G1/8, before starting
the pump. The outlet hole for the external flushing pipe, pos. C, is
∅10.
Fig. 18 Pipe connections for stuffing box operation
Note
Do not install expansion joints to make up for
inaccuracies in the pipework, such as centre
displacement or misalignment of flanges.
TM02 4979 1902TM02 4981 1902
TM02 4980 1902TM06 3413 0315 - TM06 3414 0315
B
A
C

English (GB)
17
7.8 Bearing bracket
7.8.1 Bearing bracket with grease lubrication
Fig. 19 Bearing bracket with grease nipples
Relubricate the bearings by means of a grease gun. See section
11.2.1 Grease-lubricated bearings to get recommended re-
lubricating intervals.
Fig. 20 Bearing bracket with automatic grease lubricators
The lubricators are supplied separately. Remove the grease
nipples, fit the grease lubricators on top of the bearing bracket
and set them to empty within 12 months according to the
instructions supplied with the lubricators.
7.8.2 Bearing bracket with constant-level oiler
Fig. 21 Bearing bracket with constant-level oiler
Filling of oil
Fig. 22 Filling of oil
Fig. 23 Filling of oil
Checking the oil level
The oil level in the bearing bracket will be correct as long as the
function of the constant-level oiler is correct. To check the
function of the constant-level oiler, slowly drain oil through the
drain plug until the constant-level oiler starts to operate, i.e. until
air bubbles can be seen in the reservoir.
TM06 1826 3014TM04 5173 3014TM04 5174 2709
Caution
There is no oil in bearing bracket when it is
delivered.
Note
Fit the constant-level oiler on the bearing bracket
before filling oil into the bearing bracket. See
instructions on the label on the reservoir.
TM05 3612 1612
Step Action
1 Remove the filling plug.
2
Hinge down the constant-level oiler, and pour the oil
through the filling hole until the oil reaches level in the
connection elbow. See 1 in fig. 22.
3
Fill the reservoir of the constant-level oiler with oil, and
snap it back into operating position. Now oil will be filled
into the bearing bracket. Air bubbles can be seen in the
reservoir during this process. Continue until the correct
oil level is reached. See 2 in fig. 22.
4
When no bubbles appear in the reservoir, refill the
reservoir, and snap it back into operating position. See
3 in fig. 22.
5 Fit the filling plug.
TM04 4773 2009
Caution
The oil level in the bearing bracket must always
be as shown in fig. 23.
Check the oil level regularly during operation,
and add oil, if necessary. The oil level must
always be visible in the sight glass.
Filling plug
Drain plug
Full constant-
level oiler
Correct oil level in
bearing bracket
with constant-level
oiler during
operation
Oil level in
constant-level oiler
when being filled
with oil
Oil level when
filling

English (GB)
18
7.9 Bearing monitoring
7.9.1 Vibration level
The vibration level gives an indication of the condition of the
bearings.
Bearing brackets with constant-level oiler are prepared for
vibration measurement by means of the shock pulse method
(SPM). See fig. 24.
Fig. 24 Bearing bracket with SPM measuring points
Bearing brackets with automatic grease lubricators or grease
nipples are prepared for retrofitting of SPM fittings. Holes are
plugged from factory. See fig. 25.
Fig. 25 Bearing bracket for retrofitting of SPM measuring
equipment
7.9.2 Temperature
Bearing brackets with automatic grease lubricators, grease
nipples or constant-level oiler have tappings for Pt100 sensors for
monitoring the temperature of the bearings.
These sensors can be factory-fitted, but can also be retrofitted. A
Grundfos sensor is available.
Fig. 26 Pt100 sensors fitted in bearing bracket
7.10 Pressure gauge and mano-vacuum gauge
To ensure continuous monitoring of the operation, we recommend
installing a pressure gauge on the discharge side and a mano-
vacuum gauge on the suction side. Open the pressure gauge
tappings only for test purposes. The measuring range of the
gauges must be 20 % above the maximum pump discharge
pressure.
When measuring with pressure gauges on the pump flanges, it
must be noted that a pressure gauge does not register dynamic
pressure. On all NK and NKG pumps, the diameters of the
suction and discharge flanges are different which results in
different flow velocities at the two flanges. Consequently, the
pressure gauge on the discharge flange will not show the
pressure stated in the technical documentation, but a value which
may be up to 1.5 bar or approx. 15 m lower.
7.11 Ammeter
To check the motor load, we recommend connecting an ammeter.
TM04 4925 4309TM06 3500 0415TM04 4925 4309
Plugged holes for SPM fitting
1/4" tapping for
Pt100 sensor

English (GB)
19
8. Flange forces and torques
Fig. 27 Flange forces and torques
* ΣF and ΣM are the vector sums of the forces and torques.
If not all loads reach the maximum permissible value, one of the values is allowed to exceed the normal limit. Contact Grundfos for further
information.
TM04 5621 3609
Grey cast iron Diameter
DN
Force [N] Torque [Nm]
Fy Fz Fx ΣF* My Mz Mx ΣM*
Horizontal pump, z-
axis, discharge port
32 368 315 298 578 263 298 385 560
40 438 385 350 683 315 368 455 665
50 578 525 473 910 350 403 490 718
65 735 648 595 1155 385 420 525 770
80 875 788 718 1383 403 455 560 823
100 1173 1050 945 1838 438 508 613 910
125 1383 1243 1120 2170 525 665 735 1068
150 1750 1575 1418 2748 613 718 875 1278
200 2100 2095 2600 4055 805 928 1138 1680
250 2980 2700 3340 5220 1260 1460 1780 2620
300 3580 3220 4000 6260 1720 1980 2420 3560
Horizontal pump, x-
axis, suction port
50 473 578 525 910 350 403 490 718
65 595 735 648 1155 385 420 525 770
80 718 875 788 1383 403 455 560 823
100 945 1173 1050 1838 438 508 613 910
125 1120 1383 1243 2170 525 665 735 1068
150 1418 1750 1575 2748 613 718 875 1278
200 1890 2345 2100 3658 805 928 1138 1680
250 3340 2980 2700 5220 1260 1460 1780 2620
300 4000 3580 3220 6260 1720 1980 2420 3560
350 4660 4180 3760 7300 2200 2540 3100 4560
Stainless steel Diameter
DN
Force [N] Torque [Nm]
Fy Fz Fx ΣF* My Mz Mx ΣM*
Horizontal pump, z-
axis, discharge port
32 735 630 595 1155 525 595 770 1120
40 875 770 700 1365 630 735 910 1330
50 1155 1050 945 1820 700 805 980 1435
65 1470 1295 1190 2310 770 840 1050 1540
80 1750 1575 1435 2765 805 910 1120 1645
100 2345 2100 1890 3675 875 1015 1225 1820
125 2765 2485 2240 4340 1050 1330 1470 2135
150 3500 3150 2835 5495 1225 1435 1750 2555
Horizontal pump, x-
axis, suction port
50 945 1155 1050 1820 700 805 980 1435
65 1190 1470 1295 2310 770 840 1050 1540
80 1435 1750 1575 2765 805 910 1120 1645
100 1890 2345 2100 3675 875 1015 1225 1820
125 2240 2765 2485 4340 1050 1330 1470 2135
150 2835 3500 3150 5495 1225 1435 1750 2555
200 3780 4690 4200 7315 1610 1855 2275 3360

English (GB)
20
9. Electrical connection
The electrical connection must be carried out by a qualified
electrician in accordance with local regulations.
The operating voltage and frequency are stated on the
nameplate. Make sure that the motor is suitable for the power
supply of the installation site.
The electrical connection must be carried out as shown in the
wiring diagram inside the terminal box cover.
9.1 Motor protection
Three-phase motors must be connected to a motor-protective
circuit breaker.
All three-phase Grundfos MG and MMG motors of 3 kW and up
incorporate a thermistor. See the instructions in the motor
terminal box.
Carry out the electrical connection as shown in the wiring
diagram on the back side of the terminal box cover.
9.2 Frequency converter operation
All three-phase motors can be connected to a frequency
converter.
Frequency converter operation will often expose the motor
insulation system to a heavier load and cause the motor to be
more noisy than usual due to eddy currents caused by voltage
peaks.
A large motor driven via a frequency converter will be loaded by
bearing currents.
Check these operating conditions if the pump is driven via a
frequency converter:
10. Commissioning and startup
10.1 General information
10.1.1 Pumps with stuffing box
In the case of pumps with stuffing box, check that the stuffing box
gland is correctly fitted. It must be possible to turn the pump shaft
manually. If the pump has been inactive for a long period, turn it
manually to make sure it has not got stuck. Loosen the stuffing
box or remove the packing.
10.2 Commissioning
10.2.1 Flushing the pipe system
Warning
Before removing the terminal box cover and
before removing/dismantling the pump, make
sure that the power supply has been switched off
and that it cannot be accidentally switched on
again.
The pump must be connected to an external
mains switch.
Warning
Whenever powered equipment is used in
explosive surroundings, the rules and
regulations generally or specifically imposed by
the relevant responsible authorities or trade
organisations must be observed.
Warning
Before starting any repair work on motors
incorporating a thermal switch or thermistors,
make sure that the motor cannot restart
automatically after cooling.
Operating
conditions Action
2-, 4- and 6-pole
motors, frame
size 225 and
larger
Check that one of the motor bearings is
electrically isolated. Contact Grundfos.
Noise critical
applications
Fit an output filter between the motor and
the frequency converter; this reduces the
voltage peaks and thus the noise.
Particularly noise
critical
applications
Fit a sinusoidal filter.
Cable length
Fit a cable that meets the specifications laid
down by the frequency converter supplier.
The length of the cable between motor and
frequency converter affects the motor load.
Supply voltage up
to 500 V
Check that the motor is suitable for
frequency converter operation.
Supply voltage
between 500 V
and 690 V
Fit a sinusoidal filter between the motor and
the frequency converter which reduces the
voltage peaks and thus the noise, or check
that the motor has reinforced insulation.
Supply voltage of
690 V and higher
Fit a sinusoidal filter and check that the
motor has reinforced insulation.
Note
Do not start the pump until it has been filled with
liquid and vented.
Warning
When pumping drinking water, the pump must be
flushed through with clean water before startup
in order to remove any foreign matters such as
preservatives, test liquid or grease.
Caution
The pump is not designed to pump liquids
containing solid particles such as pipe debris
and welding slag. Before starting up the pump,
the pipe system must be thoroughly cleaned,
flushed and filled with clean water.
The warranty does not cover any damage caused
by flushing the pipe system by means of the
pump.