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)
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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)
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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