Grundfos NB Installation And Operating Instructions Manual page 12
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Also See for NB:
- Installation and operating instructions manual (240 pages) ,
- Instructions manual (108 pages) ,
- Safety instructions (36 pages)
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2.2.2.1 Letter codes for shaft seals
Pos. 15 in NB, NBG type key example.
Code Description
B
Shaft seal type
Material of
Q
rotating seal
face
Material of
Q
stationary seal
Material of
secondary seal
and other rubber
E
and composite
parts, except the
wear ring
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".
2.2.2.2 Codes for rated motor power
Pos. 16 in NB, NBG type key example.
Code
[hp]
A
0.16
B
0.25
C
0.33
D
0.5
E
0.75
F
G
1.5
H
12
Explanation
A: O-ring seal with fixed
driver
B: Rubber bellows seal
D: O-ring seal, balanced
H: Cartridge seal,
balanced
A: Carbon, metal-
impregnated with antimony
which is not approved for
potable water
B: Carbon, resin-
impregnated
Q: Silicon carbide
A: Carbon, metal-
impregnated with antimony
which is not approved for
potable water
Q: Silicon carbide
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
Description
[kW]
0.12
0.18
0.25
0.37
0.55
1
0.75
1.1
2
1.5
Code
[hp]
I
J
K
5 (5.5
L
7.5
M
N
O
P
Q
R
S
T
U
V
100
W
125
Bare shaft
X
pump
Y
> 200
1
150
2
175
3
200
4
215
5
250
6
Value in bracket is for the standard IEC motor size. Value
1)
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.
Description
[kW]
3
2.2
4
3
1)
1)
)
3.7 (4
)
5.5
10
7.5
15
11
20
15
25
18.5
30
22
40
30
50
37
60
45
75
55
75
90
2)
2)
> 150
110
132
150
3)
3)
160
3)
3)
185
26
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