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Free Vent Flame Arrestor
NOMINAL PIPE DIAMETER
1
1-1/4
1-1/2
2
2-1/2
3
3-1/2
4
6
8
10
12
14
16
18
20
24
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.
NOMINAL PIPE DIAMETER
1
1-1/4
1-1/2
2
2-1/2
3
3-1/2
4
6
8
10
12
14
16
18
20
24
8 API
20 API
24 API
Assumptions: Use of SAE grade 5 bolts or studs or stronger
No lubricant
Elastomer < 70 Durometer Shore A
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.
4
Table 3. Torque Values for Raised Face Flange (Steel Only)
NUMBER OF BOLTS
4
4
4
4
4
4
8
8
8
8
12
12
12
16
16
20
24
Table 4. Torque Values for Flat Face Flange (Steel or Aluminum)
NUMBER OF BOLTS
4
4
4
4
4
4
8
8
8
8
12
12
12
16
16
20
24
16
16
20
BOLT DIAMETER
In.
mm
0.50
12.70
0.50
12.70
0.50
12.70
0.63
16.00
0.63
16.00
0.63
16.00
0.63
16.00
0.63
16.00
0.75
19.05
0.75
19.05
0.88
22.4
0.88
22.4
1.00
25.0
1.00
25.0
1.13
28.7
1.13
28.7
1.25
31.8
BOLT DIAMETER
In.
mm
0.50
12.70
0.50
12.70
0.50
12.70
0.63
16.00
0.63
16.00
0.63
16.00
0.63
16.00
0.63
16.00
0.75
19.05
0.75
19.05
0.88
22.4
0.88
22.4
1.00
25.0
1.00
25.0
1.13
28.7
1.13
28.7
1.25
31.8
0.50
12.70
0.63
16.00
0.63
16.00
TORQUE
Ft-lbs
N•m
9
12.20
13
17.63
18
24.40
35
47.45
41
55.59
60
81.35
34
46.10
43
58.30
80
108.5
109
147.8
101
136.9
135
183.0
168
227.8
159
215.6
244
330.8
214
290.2
253
343.0
TORQUE
Ft-lbs
N•m
14
18.98
16
21.69
18
24.41
32
43.39
43
58.30
47
63.72
26
35.25
32
43.39
49
66.44
68
92.20
69
93.55
98
132.9
138
187.1
125
169.5
142
192.5
135
183.0
156
211.5
20
27.12
75
101.7
75
101.7
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