Table 2.
Torque Specifications - Raised Face Flange, Steel only
NOMINAL PIPE DIAMETER
# BOLTS
BOLT DIAMETER, IN.
TORQUE, FT-LBS.
4
8
0.63
43
8
8
0.75
109
10
12
0.88
101
12
12
0.88
135
16
16
1.00
159
18
16
1.13
244
20
20
1.13
214
24
24
1.25
253
Assumptions:
Use of SAE grade 5 bolts or studs or stronger
No lubricant
Compressed mineral fiber material or similar
Notes:
If lubricant is used on bolts, apply torque reduction factor listed in Lubricant Table.
For best results hardened steel washers should be used on all cast flange bolted connections.
Table 3.
Torque Specifications - Flat Face Flange, Steel or Aluminum
NOMINAL PIPE DIAMETER
# BOLTS
BOLT DIAMETER, IN.
TORQUE, FT-LBS.
4
8
0.63
32
8
8
0.75
68
10
12
0.88
69
12
12
0.88
98
16
16
1.00
125
18
16
1.13
142
20
20
1.13
135
24
24
1.25
156
8 API
16
0.50
20
20 API
16
0.63
75
24 API
20
0.63
75
Assumptions:
Use of SAE grade 5 bolts or studs or stronger
No lubricant
Elastomer <70 Durometer Shore A
Notes:
Flat faced flanges should never be mated to a raised face flange for installation.
If lubricant is used on bolts, apply torque reduction factor listed in Lubricant Table.
For best results hardened steel washers should be used on all cast flange bolted connections.
Table 4.
Torque Reduction Factor per Lubricant
DESCRIPTION
COEFFICIENT OF FRICTION
MULTIPLY TORQUE VALUE IN TABLE BY
Machine Oil
f = 0.15
0.75
API SA2 Grease
f = 0.12
0.60
Nickel-based Lubricant
f = 0.11
0.55
Copper-based Lubricant
f = 0.10
0.50
Heavy-duty Lubricating Past
f = 0.06
0.30
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