Operating Range Of The Shaft Seal - Grundfos CR 95 Data Booklet

3

Operating range of the shaft seal

All pumps will be delivered with a HQQE/V cartridge
shaft seal as standard.
The operating range of the shaft seal depends on
operating pressure, pump type, type of shaft seal and
liquid temperature. The range shown in figs 5 and 6
applies to clean water and water with anti-freeze
liquids. For selection of the right shaft seal, see List of
pumped liquids, page 31. If the operating range is
exceeded, the life of the shaft seal may be reduced.
CR, CRN 95-155
Shaft seals for ∅22 mm shafts (15 to 75 Hp (55 kW))
p [psi (bar)]
725 (50)
580 (40)
435 (30)
(20)
290
145 (10)
0
-40 -4 32
(-40) (-20) (0) (20) (40) (60) (80) (100) (120)(140)
Fig. 5 Operating range of standard shaft seals for CR,
CRN 95-155
Standard Motor size
shaft seal [Hp (kW)]
HQQE
HQQV
15-75
(11-55)
HQBE
HQBV
12
HQQE/V
HQQE/V HQQE
HQBE/V HQBE
t
[°F (°C)]
68 104 140 176 212 248 284
Liquid
Description temperature
[°F (°C)]
O-ring (cartridge) (balanced
-40 - +248
seal), Silicon carbide/Silicon
(-40 - +120)
carbide, EPDM
O-ring (cartridge) (balanced
-4 - +194
seal), Silicon carbide/Silicon
(-20 - +90)
carbide, FKM
O-ring (cartridge) (balanced
32 - +248
seal), Silicon
(0 - +120)
carbide/carbon, EPDM
O-ring (cartridge) (balanced
32 - +194
seal), Silicon
(0 - +90)
carbide/carbon, FKM
Shaft seals for ∅28 mm (100-150 Hp (75-110 kW))
and ∅36 mm (200-300 Hp (132-200 kW)) shaft ends
p [psi (bar)]
725 (50)
580 (40)
HQQE/V
435 (30)
(20)
290
HQQE/V
HQBE/V
145 (10)
0
-40 -4 32 68 104
(-40) (-20) (0) (20) (40) (60) (80) (100) (120)(140)
Operating range of standard shaft seals for ∅28
Fig. 6
mm shaft ends (100-150 Hp (75-110 kW)) and ∅36
mm shaft ends (200-300 Hp) 132-200 kW))
Motor
Standard
size Description
shaft seal
[Hp (kW)]
O-ring (cartridge) (balanced
HQQE seal), Silicon carbide/Silicon
carbide, EPDM
O-ring (cartridge) (balanced
HQQV seal), Silicon carbide/Silicon
carbide, FKM
100-300
(75-200)
O-ring (cartridge) (balanced
HQBE seal), Silicon carbide/carbon,
EPDM
O-ring (cartridge) (balanced
HQBV seal), Silicon carbide/carbon,
FKM
CR, CRN 95-155
HQQE
HQBE
t
[°F (°C)]
140 176 212 248 284
Liquid
temperature
[°F (°C)]
-40 - +248
(-40 - +120)
-4 - +194
(-20 - +90)
32 - +248
(0 - +120)
32 - +194
(0 - +90)