Grundfos NBG 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 suction port and
radial discharge 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. Delivery and handling 3
3.1 Delivery 3
3.2 Handling 3
4. Identification 4
4.1 Nameplate 4
4.2 Type key 5
5. Applications 7
5.1 Pumped liquids 7
6. Operating conditions 7
6.1 Ambient temperature and altitude 7
6.2 Liquid temperature 7
6.3 Max. operating pressure 8
6.4 Min. inlet pressure 8
6.5 Max. inlet pressure 8
6.6 Min. flow rate 8
6.7 Max. flow rate 8
6.8 Shaft seals 9
7. Pump without motor 10
7.1 Mounting of motor on pump housing
without feet 10
7.2 Mounting of motor on pump housing with
feet 12
8. Mechanical installation 14
8.1 Preparations before installation 14
8.2 Pump location 14
8.3 Connection 15
8.4 Foundation of NB, NBG pump without
base frame 15
8.5 Foundation of NB, NBG pump with base
frame 16
8.6 Pipework 19
8.7 Vibration dampening 20
8.8 Expansion joints 20
8.9 Measuring instruments 21
9. Flange forces and torques 22
10. Electrical connection 24
10.1 Motor protection 24
10.2 Frequency converter operation 24
11. Commissioning and startup 25
11.1 General information 25
11.2 Commissioning 25
11.3 Priming 25
11.4 Checking the direction of rotation 25
11.5 Startup 26
11.6 Shaft seal run-in period 26
11.7 Start/stop 26
11.8 Reference readings of monitoring
equipment 26
12. Maintenance 27
12.1 Pump 27
12.2 Mechanical shaft seals 27
12.3 Motor 27
12.4 Lubrication 27
13. Periods of inactivity and frost
protection 27
14. Service 27
14.1 Service kits 27
15. Technical data 27
15.1 Electrical data 27
15.2 Sound pressure level 27
16. Fault finding 28
17. Disposal 29
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. Delivery and handling
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 Handling
Weight: See label on the packing.
Pumps should be lifted 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
Pump motors as from 4 kW 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
4. Identification
4.1 Nameplate
Fig. 5 Example of nameplate for NB
Legend
TM05 6006 4512
Pos. Description
1 Type designation
2 Model
3 Flow rate
4 Max. pressure/temperature
5 Country of origin
6 Pump speed
7 Pump head
8 Minimum efficiency index
9Hydraulic pump efficiency at best
efficiency point
bar/°CMAX
m /h
3
H
Q
p/t
mnmin
-1
Model
96145329
Type
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
NB 32-125.1/142 AE-F-1-A-E-S-BAQE

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 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)
A Basic version
B Oversize motor
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 (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 - nominal pressure)
110bar
216bar
325bar
440bar
5 Other pressure rating
Materials
Pump
housing Impeller Wear ring Shaft
A EN-GJL-250 EN-GJL-200 Bronze/brass 1.4301
BEN-GJL-250
Bronze
CuSn10 Bronze/brass 1.4301
C EN-GJL-250 EN-GJL-200 Bronze/brass 1.4401
DEN-GJL-250
Bronze
CuSn10 Bronze/brass 1.4401
E EN-GJL-250 EN-GJL-200 EN-GJL-250 1.4301
FEN-GJL-250
Bronze
CuSn10 EN-GJL-250 1.4301
G EN-GJL-250 EN-GJL-200 EN-GJL-250 1.4401
HEN-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

English (GB)
6
Example 1 shows an NB 32-125.1 pump with these
characteristics:
Example 2 shows an NBG 125-100-160 pump with
these characteristics:
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
EEPDM
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
• reduced performance
• 142 mm impeller
• basic version
• ATEX approval, certificate or test report
• 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 1.4301
• 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 pipework 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.

English (GB)
7
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".
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 °C to +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.
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
GBellows seal, type B, with reduced
seal faces
H Cartridge seal, balanced
Material, rotating seal face
A
Carbon, metal-impregnated
(antimony (not approved for potable
water))
B Carbon, resin-impregnated
Q Silicon carbide
Material, stationary seat
A
Carbon, metal-impregnated
(antimony (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®)
XHNBR
UDynamic O-rings in FFKM and static O-rings
in PTFE
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

English (GB)
8
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 (p)
stated on the pump nameplate. Operation against a
closed discharge valve gives the highest operating
pressure.
6.4 Min. 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 Max. inlet pressure
The inlet pressure + the pump pressure must be
lower than the maximum operating pressure (p)
stated on the pump nameplate. Operation against a
closed discharge valve gives the highest operating
pressure.
6.6 Min. 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 Max. 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. 8 Example from Grundfos Product Center
showing minimum and maximum flow
rate
TM04 0062 4907
Inlet pressure
Pump pressure
Maximum operating pressure, i.e.
pressure above atmospheric pressure
TM05 2444 5111
Minimum flow rate
Maximum flow rate

English (GB)
9
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: Operation at maximum temperature and
maximum pressure at the same time is not
recommended as the seal life will be reduced
and periodical 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)
10
7. Pump without motor
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)
11
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 3909 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)
12
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)
13
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)
14
8. Mechanical installation
8.1 Preparations before installation
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.
Ensure that the corrosion inhibitor used does not
affect the rubber parts with which it comes into
contact.
Ensure that the corrosion inhibitor can easily be
removed.
To prevent water, dust, etc. from entering the pump,
all openings must be kept covered until the pipes are
fitted. The cost of dismantling the pump during
startup to remove a foreign object can be very high.
Mechanical shaft seals are precision components. If
the mechanical shaft seal of a recently installed
pump fails, this will normally happen within the first
few hours of operation. The main cause of such
failures is improper installation of the shaft seals
and/or mishandling of the pump during installation.
During transport, the pump must be fastened
securely to prevent damage to the shaft and seal
caused by excessive vibrations and knocks. The
pump must not be lifted by means of the shaft.
8.2 Pump location
The pump should 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 metre 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 metre 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 liquids, care should be
taken to ensure that persons cannot
accidentally come into contact with hot
surfaces.
TM03 4128 1706TM03 4127 1706
0.3 m 1 m
0.25 - 4 kW 5.5 - 37 kW
0.3 m
0.25 - 4 kW
5.5 - 200 kW
1 m
0.3 m

English (GB)
15
8.3 Connection
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
It is advisable to 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.
8.4 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 should be 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 should always be
200 mm larger than the length and width of the
pump. See fig. 12.
The mass of the foundation must be at least 1.5
times the total mass of the pump. The minimum
height of the foundation (hf) can then be calculated:
The density () of concrete is usually taken as 2,200
kg/m3.
In installations where noise-less operation is
particularly important, a foundation with a mass up to
5 times that of the pump is recommended. See also
8.7 Vibration dampening on page 20.
TM03 4126 1706
Caution
The foundation/installation must be carried
out 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×concrete

English (GB)
16
8.5 Foundation of NB, NBG pump with base
frame
This section applies only to 50 Hz pumps as base
frames are not supplied for 60 Hz pumps.
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 should be 1.5
times the weight of the pump.
The foundation should 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 () 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 welded onto
the base frame).
For NB, NBG pumps with 2-pole motors ≥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.
TM05 1558 2709
hf=mpump ×1.5
Lf×Bf×concrete
TM05 1559 2709
TM05 1560 2709TM05 1561 2709
P2 ≤45 kW P2 ≥55 kW
2-pole Grouting optional Grouting mandatory
4-pole Grouting optional
6-pole Grouting optional

English (GB)
17
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 should
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.
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.
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

English (GB)
18
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 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 should 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 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)
19
8.6 Pipework
8.6.1 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. 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 suction
and the discharge side. The counter flanges should
lie true against the pump flanges without being
stressed as stress would cause damage to the
pump.
Fig. 18 NB, NBG pump installation
8.6.2 Direct mounting in pipework
Pumps fitted with motors up to and including frame
size 132 are suitable for direct mounting in
supported pipework.
Fig. 19 Direct mounting in pipework
This type of installation does not allow the use of
expansion joints.
8.6.3 Bypass
If there is any danger of the pump running against a
closed discharge valve, a minimum liquid flow
through the pump should be ensured 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.
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, the pipes
should be suspended from suitable pipe
hangers.
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.

English (GB)
20
8.7 Vibration dampening
8.7.1 Elimination of noise and vibrations
In order to achieve optimum operation and minimum
noise and vibration, consider vibration dampening of
the pump. Generally, always consider this for pumps
with motors of 11 kW and up. For motors of 90 kW
and up vibration dampening should be considered
mandatory. 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. 18.
8.7.2 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 dampening 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 should 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.
8.8 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
(only rubber bellows expansion joints).
The expansion joints should be fitted at a minimum
distance of 1 to 1 1/2 pipe diameters (DN) 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 > 5 m/s,
we recommend fitting larger expansion joints
matching the pipework.
Figures 20 and 21 show examples of rubber bellows
expansion joints with or without limiting rods.
Fig. 20 Rubber bellows expansion joint with
limiting rods
Note
Do not install expansion joints to make up
for inaccuracies in the pipework, such as
centre displacement or misalignment of
flanges.
TM02 4979 1902