Grundfos NB Series User manual

NB, NBG
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
NB, NBG are non-self-priming, single stage,
centrifugal volute pumps with axial inlet port and
radial outlet port.
NB pumps comply with EN 733.
NBG pumps comply with ISO 2858.
1. Symbols used in this document 2
2. General information 2
3. Receiving the product 3
3.1 Delivery 3
3.2 Transporting the product 3
3.3 Handling the product 3
3.4 Storing the product 4
4. Identification 4
4.1 Nameplate 4
4.2 Type key 5
5. Applications 8
5.1 Pumped liquids 8
6. Operating conditions 8
6.1 Ambient temperature and altitude 8
6.2 Liquid temperature 8
6.3 Max. operating pressure 8
6.4 Minimum inlet pressure 9
6.5 Maximum inlet pressure 9
6.6 Minimum flow rate 9
6.7 Maximum flow rate 9
6.8 Shaft seals 10
7. Mounting of motor on bare shaft pumps11
7.1 Mounting of motor on pump housing
without feet 11
7.2 Mounting of motor on pump housing with
feet 13
8. Mechanical installation 15
8.1 Pump location 15
8.2 Installation positions 16
8.3 Foundation of NB, NBG pump without
base frame 16
8.4 Foundation of NB, NBG pump with base
frame 17
8.5 Pipework 20
8.6 Vibration damping 21
8.7 Expansion joints 21
8.8 Measuring instruments 22
9. Flange forces and torques 23
10. Electrical connection 25
10.1 Motor protection 25
10.2 Frequency converter operation 25
11. Startup 26
11.1 General information 26
11.2 Priming 26
11.3 Checking the direction of rotation 26
11.4 Starting up the pump 27
11.5 Shaft seal run-in period 27
11.6 Start/stop 27
11.7 Reference readings of monitoring
equipment 27
12. Maintenance 28
12.1 Pump 28
12.2 Mechanical shaft seals 28
12.3 Motor 28
12.4 Lubrication 28
13. Periods of inactivity and frost
protection 28
14. Service 28
14.1 Service kits 28
15. Technical data 28
15.1 Electrical data 28
15.2 Sound pressure level 29
16. Fault finding 30
17. Disposal 31
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.

English (GB)
3
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.
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. Do
not lift the pump by means of the shaft.
3.3 Handling the product
Weight: See label on the packing.
Lift the pumps by means of nylon straps and
shackles or a hook as shown on figs 1to 3.
Fig. 1 Correct lifting of pump without base
frame
Fig. 2 Correct lifting of pump with base frame
Fig. 3 Correct lifting of pump without motor
Fig. 4 Incorrect lifting of pump
Warning
Pay attention to the pump weight, and take
precautions to prevent personal injury if
the pump should topple or fall by accident.
Warning
Motors from 4 kW and up are supplied with
lifting eyes which must not be used for
lifting the entire pump unit. See fig. 4.
TM03 3973 1306
TM04 5179 2809TM05 3309 1112TM03 3972 1306

English (GB)
4
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 easily be
removed.
To prevent water, dust, etc. from entering the pump,
keep all openings covered until the pipes are to be
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. 5 Example of nameplate for NB
Legend
TM05 6006 4512
Pos. Description
1 Type designation
2 Model
3 Rated flow rate
4 Pressure rating or maximum temperature
5 Country of origin
6 Rated speed
7 Head
8 Minimum efficiency index
9Hydraulic efficiency at optimum efficiency
point
bar/°CMAX
m /h
3H
Q
p/t
mnmin-1
Model
96145329
Type
NB 32-125.1/142 AE-F-1-A-E-S-BAQE
B 96126252 P2 0612 0001
23.4 22.6 2900
16/120
Made in Hungary
6
7
1
2
3
4
5
%
DK-8850 Bjerringbro, Denmark
89
0(, p
Ș
0.70 68.8

English (GB)
5
4.2 Type key
Model B
Example 1, pump design according to EN 733 NB 32 -125 .1 /142 AE F 1 A E S BAQE
Example 2, pump design according to ISO 2858 NBG 125 -100 -160 /160-142 A F 2 N K S DQQK
Type range
Nominal diameter of inlet port (DN)
Nominal diameter of outlet port (DN)
Nominal impeller diameter [mm]
Reduced performance: .1
Actual impeller diameter [mm]
Code for pump version; the codes may be combined
A Basic version
BOversizemotor
C Without motor
D Pump housing with feet
EWith ATEX approval, certificate or test report, the second character of the pump
version code is an E
F Version with base frame
S With support blocks
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 1.4301
B EN-GJL-250 Bronze
CuSn10 Bronze/brass 1.4301
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 1.4301
F EN-GJL-250 Bronze
CuSn10 EN-GJL-250 1.4301
G EN-GJL-250 EN-GJL-200 EN-GJL-250 1.4401

English (GB)
6
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
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
Material of O-ring for pump cover
E EPDM
F FXM (Fluoraz®)
K FFKM (Kalrez®)
M FEPS (PTFE-sheathed silicone O-ring)
X HNBR
VFKM(Viton
®)
Shaft seal arrangement
S Single seal
Code for mechanical shaft seal and shaft seal rubber parts
Example 1, pump design according to EN 733 NB 32 -125 .1 /142 AE F 1 A E S BAQE
Example 2, pump design according to ISO 2858 NBG 125 -100 -160 /160-142 A F 2 N K S DQQK

English (GB)
7
Example 1 shows an NB 32-125.1 pump with these
characteristics:
Example 2 shows an NBG 125-100-160 pump with
these characteristics:
4.2.1 Letter codes for shaft seals
For a thorough description of shaft seal types and materials, see the English-language data booklet entitled
"NB, NBG, NK, NKG, NBE, NBGE, NKE, NKGE - Custom-built pumps according to EN 733 and ISO 2858".
• reduced performance
• 142 mm impeller
• basic version
• ATEX approval, certificate or test report
• DIN flange to EN 1092-2 pipe 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 1.4301
• EPDM O-ring for pump cover
• single shaft seal arrangement
• BAQE shaft seal.
• 160-142 mm conical impeller
• basic version
• DIN flange to EN 1092-2 pipe connection
• 16 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-ring for pump cover
• single shaft seal arrangement
• DQQK shaft seal.
Example: 10 = BAQE B A Q E
Shaft seal type
A O-ring seal with fixed driver
B Rubber bellows seal
D O-ring seal, balanced
G Bellows seal, type B, with reduced seal faces
H Cartridge seal, balanced
Material, rotating seal face
A Carbon, metal-impregnated with antimony which is not approved for potable water
B Carbon, resin-impregnated
Q Silicon carbide
Material, stationary seat
A Carbon, 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
E EPDM
VFKM(Viton
®)
FFXM(Fluoraz
®)
K FFKM (Kalrez®)
XHNBR
U Dynamic O-rings in FFKM and static O-rings in PTFE

English (GB)
8
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.
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. 6, 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. 6 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 % = 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 Max. operating pressure
Fig. 7 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
valve gives the highest operating pressure.
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
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
TM04 0062 4907
Inlet pressure
Pump pressure
Maximum operating pressure, i.e.
pressure above atmospheric pressure

English (GB)
9
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
valve gives the highest operating pressure.
6.6 Minimum flow rate
The pump must not run against a closed 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
Do not exceed the maximum flow rate 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.
See www.grundfos.com.
Fig. 8 Example from Grundfos Product Center
in www.grundfos.com showing minimum
and maximum flow rate
TM05 2444 5111
Minimum flow rate
Maximum flow rate

English (GB)
10
6.8 Shaft seals
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 that you operate
the pump at maximum temperature and
maximum pressure at the same time as
the seal life will be reduced and periodic
noise will occur.
Shaft seal diameter [mm] 28, 38 48 55 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 - +120 °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

English (GB)
11
7. Mounting of motor on bare shaft
pumps
7.1 Mounting of motor on pump housing
without feet
The pumps are supplied with a transport bracket
protecting the shaft seal during transport. When you
mount the motor, follow the instructions shown in
these drawings.
TM05 3327 1212 TM03 3906 1212
1. Remove the coupling guard and loosen the
set screws in the shaft.
2. Place the pump on the motor.
TM03 3907 1212 TM03 3908 1212
3. Fit and tighten the motor screws to the
correct torque. See below.
4. Remove the nut, washer and transport
bracket.
M8: 12 ± 2.4 Nm
M10: 25 ± 5 Nm
M12: 40 ± 8 Nm
M16: 100 ± 20 Nm
M20: 150 ± 30 Nm
M24: 200 ± 40 Nm

English (GB)
12
TM03 3909 1212 TM03 3910 1212
5. Press down the threaded pipe to ensure that
the shaft is in bottom position.
6. Remove the threaded pipe.
TM03 3911 1212 TM03 3912 1212
7. Apply Loctite 243 to the threads of the set
screws. Tighten the set screws to the correct
torque. See below.
8. Fit the coupling guard. Tighten the screws to
the correct torque. See below.
M5: 6 ± 2 Nm M5 x 10 mm: 6 ± 2 Nm
M6: 8 ± 2 Nm
M8: 15 ± 3 Nm

English (GB)
13
7.2 Mounting of motor on pump housing
with feet
The pumps are supplied with a transport bracket
protecting the shaft seal during transport. When you
mount the motor, follow the instructions shown in
these drawings.
TM03 3913 1206 TM03 3905 1206
1. Remove the coupling guard and loosen the
set screws in the shaft.
2. Place the pump at the end of the motor and
push the parts together.
TM03 3914 1206 TM03 3915 1206
3. Fit and tighten the motor screws to the
correct torque. See below.
4. Remove the nut, washer and transport
bracket.
M8: 12 ± 2.4 Nm
M10: 25 ± 5 Nm
M12: 40 ± 8 Nm
M16: 100 ± 20 Nm
M20: 150 ± 30 Nm
M24: 200 ± 40 Nm

English (GB)
14
TM03 3916 1206 TM03 3917 1206
5. Press down the threaded pipe to ensure that
the shaft is in bottom position.
6. Remove the threaded pipe.
TM03 3918 1206 TM03 3919 1206
7. Apply Loctite 243 to the threads of the set
screws. Tighten the set screws to the correct
torque. See below.
8. Fit the coupling guard. Tighten the screws to
the correct torque. See below.
M5: 6 ± 2 Nm M5 x 10 mm: 6 ± 2 Nm
M6: 8 ± 2 Nm
M8: 15 ± 3 Nm

English (GB)
15
8. Mechanical installation
8.1 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.
Vertical installation
• Pumps fitted with motors up to and including 4
kW require a 0.3 m clearance above the motor.
• Pumps fitted with motors of 5.5 kW and up
require at least a 1 m clearance above the motor
to allow the use of lifting equipment.
Fig. 9 Clearance above the motor
Horizontal installation
• 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.
• NB pumps with base frame must have the same
clearance as pumps with motors from 5.5 to 200
kW.
Fig. 10 Clearance behind the motor
Warning
When pumping hot or cold liquids, take
care to ensure that persons cannot
accidentally come into contact with hot or
cold surfaces.
TM03 4128 1706
0.3 m 1 m
0.25 - 4 kW 5.5 - 37 kW
TM03 4127 1706
0.3 m
0.25 - 4 kW
5.5 - 200 kW
1 m
0.3 m

English (GB)
16
8.2 Installation positions
Arrows on the pump housing show the direction of
flow of liquid through the pump.
The pumps can be installed with the motor/pump
shaft in all positions between vertical and horizontal,
but the motor must never fall below the horizontal
plane.
Horizontal motors with feet must always be
supported.
Fig. 11 Installation positions
Fit isolating valves on either side of the pump as this
makes it unnecessary to drain the system if the
pump needs to be cleaned or repaired.
8.3 Foundation of NB, NBG pump without
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 at
least 1.5 times the weight of the pump. The concrete
foundation must have an absolutely level and even
surface.
Place the pump on the foundation, and fasten it. See
fig. 12.
Fig. 12 Foundation
The foundation length and width must always be 200
mm larger than the length and width of the pump.
See fig. 12.
The minimum height of the foundation, hf, can then
be calculated:
The density, δ, of concrete is usually taken as 2,200
kg/m3.
In installations where noise-less operation is
particularly important, we recommend a foundation
with a mass up to 5 times that of the pump. See also
8.6 Vibration damping on page 21.
TM03 4126 1706
Caution
Carry out the foundation/installation in
accordance with the following instructions.
Non-compliance may result in functional
faults which will damage the pump
components.
0.25 - 37 kW 0.25 - 200 kW
TM03 4130 1706
hf=mpump ×1.5
Lf×Bf×δconcrete

English (GB)
17
8.4 Foundation of NB, NBG pump 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. 13.
Fig. 13 Foundation, X = min. 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. 14.
Fig. 14 Correct foundation
Fig. 15 Incorrect foundation
Fig. 16 Base frame with pouring holes
It is important to prepare a good foundation prior to
the installation of the pump.
NB, NBG pumps with base frame are always
prepared for grouting. Grouting anchors are welded
to the base frame.
For NB, NBG 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.
Procedure
1. Preparing the foundation
2. Levelling of the base frame
3. Grouting.
Note
This section applies only to 50 Hz pumps
as base frames are not supplied for 60 Hz
pumps.
TM05 1558 2709
hf=mpump ×1.5
Lf×Bf×δconcrete
TM05 1559 2709
TM05 1560 2709TM05 1561 2709
Poles 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)
18
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 19-32 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 part of base frame, nuts
and washers.
TM03 0190 4707
3
Let the foundation cure for several days
before levelling and grouting the base
frame.
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
is rough
Pipe sleeve
LugWasher
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 5183 2809
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)
19
3: 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.
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 we recommend
that you 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.
3Ensure proper shuttering at both ends of
the base frame.
TM05 1562 3011
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 pouring the
grout, 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)
20
8.5 Pipework
8.5.1 Piping
When installing the pipes, make sure that the pump
housing is not stressed by the pipes.
The inlet and outlet 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 inlet side of the pump.
Fig. 17 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 inlet and
the outlet side. The counter-flanges must lie true
against the pump flanges without being stressed as
stress would cause damage to the pump.
Fig. 18 NB, NBG pump installation
8.5.2 Direct mounting in pipes
Pumps fitted with motors up to and including frame
size 132 are suitable for direct mounting in
supported pipes.
Fig. 19 Direct mounting in pipes
This type of installation does not allow the use of
expansion joints.
8.5.3 Bypass
If there is any danger of the pump running against a
closed valve, ensure a minimum liquid flow through
the pump by connecting a bypass or drain to the
outlet 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.
TM00 2263 3393TM05 3311 1112
tt
ttttttt tttt tttt tttt tttt 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
TM05 3337 1212
Note
To ensure quiet operation, suspend the
pipes from suitable pipe hangers.
Warning
The pump must not 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.