Grundfos NBS Operating instructions

NBS, NBSE
Service instructions
GRUNDFOS INSTRUCTIONS

NBS, NBSE
English (GB)
Service instructions ........................................................................4
3
Table of contents

English (GB) Service instructions
Original service instructions
Table of contents
1. General information ........................4
1.1 Hazard statements..........................4
1.2 Notes ..................................4
1.3 Target group..............................4
2. Identification .............................5
2.1 Nameplate...............................5
2.2 Type key ................................6
3. Service tools ............................10
4. Disassembly and assembly ..................11
4.1 Disassembling the pump .....................11
4.2 Checking gap between impeller and pump housing/
cover (wear rings) .........................14
4.3 Removing the impeller ......................14
4.4 Assembling the pump .......................15
5. High pressure seal replacement ...............22
5.1 Dismantling old seal ........................22
5.2 Assembling new seal .......................23
6. Reference information......................26
6.1 Torque table .............................26
6.2 Recommended lubricants ....................26
6.3 Gap between impeller and pump housing/cover (wear
rings) .................................27
6.4 Related documents ........................28
6.5 Service videos ...........................28
7. Fault finding ............................29
8. Exploded drawings........................31
1. General information
Read this document before you start service work on the
product. Service work must comply with local regulations
and accepted codes of good practice.
Observe the safety instructions in the installation and op-
erating instructions for the product.
1.1 Hazard statements
The symbols and hazard statements below may appear in Grundfos
installation and operating instructions, safety instructions and
service instructions.
DANGER
Indicates a hazardous situation which, if not avoided, will
result in death or serious personal injury.
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious personal injury.
CAUTION
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate personal injury.
The hazard statements are structured in the following way:
SIGNAL WORD
Description of the hazard
Consequence of ignoring the warning
• Action to avoid the hazard.
1.2 Notes
The symbols and notes below may appear in Grundfos installation
and operating instructions, safety instructions and service
instructions.
Observe these instructions for explosion-proof products.
A blue or grey circle with a white graphical symbol indi-
cates that an action must be taken.
A red or grey circle with a diagonal bar, possibly with a
black graphical symbol, indicates that an action must not
be taken or must be stopped.
If these instructions are not observed, it may result in mal-
function or damage to the equipment.
Tips and advice that make the work easier.
1.3 Target group
These service instructions are intended for professional installers,
operators and service technicians of the product.
We recommend that service and maintenance be carried out by
skilled persons with technical qualifications required by the specific
legislation in force.
4
English (GB)

2. Identification
2.1 Nameplate
DK-8850 Bjerringbro, Denmark
99616313
n 1750 RPM
PN-SN 99931992-10000546 PC P9-2048
Assembled In Brookshire, TX
PEI CL 0.88
Q 2022.6 GPM H 101.5 ft p/t 175/248
Model NBS 060-110/10.75AAG6S2ESBQQETW4
Imp.Dia 10.75 (in.)
11
10 8
4 7 9
6
5
3
1
2
TM075296
Example of NBS nameplate
Pos. Description
1 Type designation
2 Product number and production serial number
3 Flow
4 Head
5 Production code
6 Pressure and temperature
7 Pump speed
8 Impeller diameter
9PEI CL: Pump Energy Index, constant load
PEI VL: Pump Energy Index, variable load
10 Place of production
11 Field for approval marks and associated texts
2.1.1 Looking up service parts in Grundfos Product Center
• Always check the production code (PC code) on the nameplate
before looking up service parts in Grundfos Product Center.
• Different codes are created if the modified service parts are not
backwards interchangeable.
TM080702
5
English (GB)

2.2 Type key
Example 1: NBS 025-095/08.43AAEG6S3ESBQQETX2
Example 2: NBS 040-150/16.77AFEG7TBESDQQE1X4
Example 3: NBS 060-135/1291-1276AAEG7TBESDQQEWX4
Example 4: NBSE 025-110/11.02ASFEG6S2ESBQQENDA
Example 5: NBSE 030-110/1094-1063ACAEG7S7FSDAQFODA
Pos. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Example 1 NBS 025 -095 /8.43 A AE G 6 S3 E S BQQE T X 2
Example 2 NBS 040 -150 /16.77 A FE G 7 TB E S DQQE 1 X 4
Example 3 NBS 060 -135 /1291-1276 A AE G 7 TB E S DQQE W X 4
Example 4 NBSE 025 -110 /11.02 A S FE G 6 S2 E S BQQE N D A
Example 5 NBSE 030 -110 /1094-1063 A C AE G 7 S7 F S DAQF O D A
Pos. Explanation
1 Type range
2 Nominal diameter of outlet port (DN)
3 Nominal impeller diameter [inch]
4 Actual impeller diameter [inch]
5
Impeller type
'blank': Closed impeller, cylindrical trim. If one dimension is shown the impeller has a cylindrical trim, for example 11.02
'blank': Closed impeller, conical trim. If two dimensions are shown the impeller has a conical trim, for example 1094-1063
S: Semi-open impeller
V: Super vortex impeller
6
Hydraulic version
A: 1st version
B: 2nd version
C: 3rd version
D: 4th version
7
Sensor version
'blank': Pump without sensor
C: Without built-in sensor, one cable and one pressure sensor are supplied with the pump
S: Pump with built-in differential-pressure sensor, Series 2000
8
Code for pump version; the codes may be combined
A: Basic version
B: Oversize motor
C: Without motor
(+E): With ATEX approval, certificate or test report, the second character of the code for pump version is an E
F: Design with base frame
(+S): With support rails, the second character of the pump version code is an S
X: Special version; used in case of further customisationcustomization than already listed
9Pipe connection
G: ANSI flange
10
Flange pressure rating (PN - rated pressure)
5: Other pressure rating
6: Class 125, 175 PSI
7: Class 300, 363 PSI
6
English (GB)

Pos. Explanation
11
Code for materials
Code Pump housing Impeller Wear ring Shaft
S2 A48 Class 35 304 No wear ring 420
S3 A48 Class 35 304 No wear ring 304
S4 A48 Class 35 304 No wear ring 316
S5 A48 Class 35 304 No wear ring SAF 2205
S6 A48 Class 35 316 No wear ring 420
S7 A48 Class 35 316 No wear ring 304
S8 A48 Class 35 316 No wear ring 316
S9 A48 Class 35 316 No wear ring SAF 2205
SA 70-50-05 304 No wear ring 420
SB 70-50-05 304 No wear ring 304
SC 70-50-05 304 No wear ring 316
SD 70-50-05 304 No wear ring SAF 2205
SE 70-50-05 316 No wear ring 420
SF 70-50-05 316 No wear ring 304
SG 70-50-05 316 No wear ring 316
SH 70-50-05 316 No wear ring SAF 2205
T2 A48 Class 35 CD4MCuN/A890 No wear ring SAF 2205
TA 70-50-05 CD4MCuN/A890 No wear ring SAF 2205
X Special version
12
Rubber parts in pump
E: EPDM
F: FXM (Fluoraz®)
K: FFKM (Kalrez®)
M: FEPS (PTFE-sheathed silicone O-ring)
O: HNBR
V: FKM (Viton®)
13 Shaft seal arrangement
S: Single seal
14 Shaft seal in pump
Letter code for mechanical shaft seal and shaft seal rubber parts. See section Letter codes for shaft seals.
15 Code for rated motor power [kW]. See section Codes for rated motor power.
16 Code for phase and voltage [V] or other information. See section Codes for phase and voltage or other information.
17 Code for speed variant [rpm]. See section Codes for speed variant.
7
English (GB)

2.2.1 Letter codes for shaft seals
Pos. 14 in NBS type key example.
Code
example Description Code explanation
B Shaft seal type
A: O-ring seal with fixed driver
B: Rubber bellows seal D: O-ring seal, balanced
H: Cartridge seal, balanced
Q Material of rotating seal face
A: Carbon, metal-impregnated with antimony which is not approved for potable water
B: Carbon, resin-impregnated
Q: Silicon carbide
Q Material of stationary seal A: Carbon, metal-impregnated with antimony which is not approved for potable water
Q: Silicon carbide
E
Material of secondary seal and other
rubber and composite parts, except
the wear ring
E: EPDM
V: FKM (Viton®)
F: FXM (Fluoraz®)
K: FFKM (Kalrez®)
X: HNBR
U: Dynamic O-rings in FFKM and static O-rings in PTFE
8
English (GB)

2.2.2 Codes for rated motor power
Pos. 15 in NBSE, NBS type key example.
Code Description
[hp] [kW]
A 0.16 0.12
B 0.25 0.18
C 0.33 0.25
D 0.5 0.37
E 0.75 0.55
F 1 0.75
G 1.5 1.1
H 2 1.5
I 3 2.2
J 4 3
K5 (5.51) 3.7 (41)
L 7.5 5.5
M 10 7.5
N 15 11
O 20 15
P 25 18.5
Q 30 22
R 40 30
S 50 37
T 60 45
U 75 55
V 100 75
W 125 90
X Bare pump
Y> 2002> 1502
1 150 110
2 175 132
3 200 150
42153160
52503185
1 Value in bracket is for the standard IEC motor size. Value outside
bracket is for the motor size according to NEMA standards.
2 Used for pumps where the pump shaft input power exceeds 200
hp (150 kW) and is not regulated under the DOE pump rule.
3 Special cases with power sizes above 200 hp (150 kW) which are
still regulated under the DOE pump rule. For example: Pump has a
P2 value of 198 hp (147.6 kW) in its duty point (in DOE scope) but
customer wants the 215 hp (160 kW) motor instead of the 200 hp
(150 kW). The pump is in scope of the DOE regulation and requires
a PEI value and a motor code.
2.2.3 Codes for phase and voltage or other information
Pos. 16 in NBSE, NBS type key example.
Code Description
AE-motor (ECM1), 1 x 200-240 V
BE-motor (ECM1), 3 x 200-240 V
CE-motor (ECM1), 3 x 440-480 V
DE-motor (ECM1), 3 x 380-500 V
VIntended for use with external VFD only, asynchronous
motor
W Not for sale in North America
XNo motor or US DOE regulated motor (CC marked mo-
tor)
Y Out of DOE scope
Z E-motor, asynchronous motor
1 ECM: Electronically Commutated Motor.
2.2.4 Codes for speed variant
Pos. 17 in NBSE, NBS type key example.
Code Description
A1450-2200 RPM, E-motor (ECM1)
B2900-4000 RPM, E-motor (ECM1)
C4000-5900 RPM, E-motor (ECM1)
1 2-pole, 50 Hz (Asynchronous motor)
2 2-pole, 60 Hz (Asynchronous motor)
3 4-pole, 50 Hz (Asynchronous motor)
4 4-pole, 60 Hz (Asynchronous motor)
5 6-pole, 50 Hz (Asynchronous motor)
6 6-pole, 60 Hz (Asynchronous motor)
7 8-pole, 50 Hz (Asynchronous motor)
8 8-pole, 60 Hz (Asynchronous motor)
1 ECM: Electronically Commutated Motor.
9
English (GB)

3. Service tools
Ring/open-end spanner Hexagon T-key Cross-recess screwdriver Reversible-bit screwdriver
Bits kit Hexagon key Plastic hammer Pry bar
1234 56
cm Tension
Tester
Torque wrench Punch for shaft seal Gauge for inner diameter meas-
urement of wear ring Soft jaws
Pinch bar Sliding gauge Ratchet spanner with socket Hexagon key set
Steel brush Safety shoes Safety helmet Safety gloves
Screwdriver, Torx Sprayer
10
English (GB)

4. Disassembly and assembly
WARNING
Overhead load
Death or serious personal injury
‐Pay attention to the pump weight, and take precau-
tions to prevent personal injury if the pump topples or
falls by accident.
CAUTION
Crushing of feet
Minor or moderate personal injury
‐Do not drop pump components when servicing the
product.
Check also the following service videos in association with this task:
How to dismantle and assemble Grundfos NBS
single-stage pump
How to replace low pressure shaft seal on Grund-
fos NBS single-stage pump
4.1 Disassembling the pump
1. Remove coupling guard.
TM080356
2. Remove fork tool to access the split coupling.
TM080357
3. Loosen coupling screws.
TM080358
4. Remove split coupling pieces.
TM080359
5. Loosen set screws which fixate motor and pump keys.
TM080360TM080361
11
English (GB)

6. Remove pump and motor keys.
TM080362
7. Loosen seal cover screws.
TM080363
8. Remove seal cover.
TM080364
9. If seal cover is stuck to the pump housing cover use two seal
cover screws as jacking bolts.
10. Remove stationary part of the shaft seal from seal cover.
TM080367
11. Note O-ring condition on shaft seal and on seal cover (surface
cracks, stiffness, swelling).
12. Remove rotating part of the shaft seal.
TM080369TM080370
12
English (GB)

13. Check condition of spring and seal face.
14. Loosen motor from support rails.
TM080372
15. Loosen motor from motor stool.
TM080373
16. Move motor enough to enable removal of motor stool.
TM080374
17. Loosen and remove motor stool from pump housing.
TM080366
18. Loosen pump cover from pump housing.
TM080376
19. Note 12 o’clock position of pump cover correlating with the
position of seal cover.
20. Remove pump cover and the impeller.
TM080378
13
English (GB)

21. Note condition of cover O-ring (surface cracks, stiffness and
swelling).
4.2 Checking gap between impeller and pump housing/
cover (wear rings)
1. Measure and note the diameter of impeller and pump housing
interfaces.
TM080380
Two measurements must be made (positions 12-6 and
3-9). The wear ring may be worn oval due to different
directions of radial forces.
TM080471
2. Measure and note the bore in cover (wear ring, if fitted).
TM080381
3. Measure and note impeller interface to pump housing.
• For maximum gap values, see the dedicated section for Gap
between impeller and pump housing/cover (wear rings).
TM080382
Related information
6.3 Gap between impeller and pump housing/cover (wear rings)
4.3 Removing the impeller
1. Remove impeller from shaft, always use soft jaws in the vice
TM080383
14
English (GB)

4.4 Assembling the pump
1. Assemble impeller to the shaft.
• Fit impeller key.
• Impeller eye at the same side as where the impeller is
tightened.
TM080384
2. Assembly sequence – washer, spring washer and nut.
TM080385
3. Tighten impeller nut.
For the required torque, see Torques table.
Apply thread lubricant where torque tightening is re-
quired.
Use locally approved thread lubricants, for example,
NEVER-SEEZ.
TM080386
TM080387
4. Check condition and cleanliness for pump cover and O-ring.
Use locally approved lubricants, for example, Rocol
Sapphire Aqua SIL.
TM080388
5. Assemble impeller and pump cover.
Marking on the pump cover must point upwards at 12
o’clock position.
TM080389
15
English (GB)

6. Tighten pump cover nuts.
For the required torque, see Torques table.
TM080390
7. Assemble motor stool and pump housing, and tighten nuts.
For the required torque, see Torques table.
TM080391TM080392
8. Assemble motor stool and motor, and tighten nuts.
For the required torque, see Torques table.
TM080393
9. Fit motor to support rails.
TM080394
10. Clean pump shaft, remove rust and debris.
Use steel brush or emery grinding paper.
TM080395
16
English (GB)

11. Lubricate new shaft seal inside the bellow.
Use locally approved lubricants, for example, Rocol
Sapphire Aqua SIL.
TM080396
Make sure NOT to touch the seal face.
TM080397
12. Hand press the shaft seal into position until it rests against the
impeller.
TM080398
13. Check condition and cleanliness of seal cover.
TM080399
14. Lubricate O-rings.
Use locally approved lubricants, for example, Rocol
Sapphire Aqua SIL.
TM080400TM080401
17
English (GB)

15. Spray soapy water on seal face of stationary shaft seal part.
Lubricate seal faces with soapy water, shaft seal with
seal face combination xQQx (silicon carbide-silicon
carbide) must NEVER run dry.
TM080402
Make sure NOT to touch the seal faces by hand.
TM080403
16. Use a soft tool to position the stationary seal part in seal cover.
TM080404
17. Apply thread lubricant where torque tightening is required.
Use locally approved thread lubricants, for example,
NEVER-SEEZ.
TM080405
18. Make sure that the plug in the seal cover points upwards.
TM080406
19. Tighten the seal cover screws.
For the required torque, see Torques table.
TM080407
18
English (GB)

20. Align shaft key slots to the position of 10 o’clock.
TM080408
21. Assemble keys to motor and pump shaft.
TM080409
22. Use the fork tool to compress the shaft seal spring before
assembling the split coupling.
TM080410TM080411
Use locally approved thread lubricants, for example,
NEVER-SEEZ.
TM080412
19
English (GB)

23. Check condition and cleanliness of the split coupling pieces.
TM080413
24. Make sure that:
• The split coupling pieces engage with shaft keys.
• The coupling rests against the fork tool flap.
TM080414
25. Keep the gap between the coupling pieces equal.
If you do not have an equal gap, loosen the side with
the smaller gap and tighten the side with the larger
gap until both sides are equal.
TM080415
26. Tighten by hand, and check the coupling gap.
TM080416
27. Remove the fork tool.
TM080417
28. Cross-tighten coupling screws.
For the required torque, see Torques table.
TM080418
20
English (GB)