Grundfos NB - Page 8

2.3.2.1 Letter codes for shaft seals
Pos. 14 in NB type key example.
Code Description 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
2.3.2.2 Codes for rated motor power
Pos. 15 in NB 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
K
5 (5.5
1)
) 3.7 (4
1)
)
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 shaft pump
Y
> 200
2)
> 150
2)
1 150 110
2 175 132
3 200 150
4
215
3)
160
3)
5
250
3)
185
3)
6 26
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.
8
English (US)