Grundfos CRN 125-7, Installation And Operating Instructions Manual

Page: 18 / 38

5.8 Tightening torques
WARNING
Flange gasket blowout
Death or serious personal injury
‐
Tighten flange bolts according to
the specified torque values.
WARNING
Falling objects
Death or serious personal injury
‐
Tighten the base plate anchor bolts
according to the specified torque
values.
The tables show the recommended torques for
base plate anchor bolts and flange bolts.
The bolt quality must be minimum class 5.8
except for CR, CRN 95 with optional small base
plate which must be minimum class 8.8.
Base plate anchor bolts
UNC bolts:
CR, CRN
Base plate anchor bolts
Bolt size Torque
[
∅
inch] [lbf-ft] [Nm]
95 with
optional
small base
plate
UNC 1/2-13
(
⌀
9/16" free hole)
52 71
95
UNC 5/8-11
(
⌀
11/16" free hole)
74 100
125-155
UNC 3/4-10
(
⌀
7/8" free hole)
66 1)
140
2)
90 1)
190
2)
185-255
UNC 7/8-9
(
⌀
1" free hole)
100 136
1) Applies for pumps fitted with motors up to and including
75 HP.
2) Applies for pumps fitted with motors of 100 HP and up.
Metric bolts:
CR, CRN
Base plate anchor bolts
Bolt size Torque
[
∅
mm] [Nm] [lbf-ft]
95 with
optional
small base
plate
M12
(
⌀
14 free hole)
65 48
95
M16
(
⌀
18 free hole)
100 75
125-155
M20
(
⌀
22 free hole)
90
1)
190
2)
66
1)
140
2)
185-255
M24
(
⌀
26 free hole)
130 96
Flange bolts
UNC bolts and ANSI flanges:
CR, CRN
Flange bolts
ANSI
Bolt size
Torque
[lbf-ft] [Nm]
95
UNC 5/8-11 25 34
UNC 3/4-10 60 81
125-155
UNC 3/4-10 60 81
UNC 1-8 66 90
185-255
UNC 3/4-10 110 149
UNC 7/8-9 185 251
Metric bolts and DIN/EN, JIS flanges:
CR, CRN
Flange bolts
DIN/EN, JIS
Bolt size
Torque
[Nm] [lbf-ft]
95
M16 30 22
M20 90 66
125-155
M20 90 66
M24 230 170
185-255
M20 90 66
M24 230 170
M27 300 222
18
English (US)