Grundfos NBS Serie Instrucciones De Instalación Y Operación página 8

Letter codes for shaft seals
Pos. 14 in NBS type key example.
Code
Description
example
B Shaft seal type
Material of rotating
Q
seal face
Material of stationary
Q
seal
Material of
secondary seal and
E other rubber 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".
8
Code 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
Codes for rated motor power
Pos. 15 in NBS 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
I
J
K
5 (5.5
L 7.5
M
N
O
P
Q
R
S
T
U
V 100
W 125
X Bare shaft pump
Y
> 200
1 150
2 175
3 200
4
215
5
250
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.
Description
[kW]
0.12
0.18
0.25
0.37
0.55
1 0.75
1.1
2 1.5
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