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C-46
Bolt Stress
Minimum Recommended
Nom.
30,000 psi
60,000 psi
75,000 psi
Assembly Stress
Pipe Number Size
Bolt
Gasket
Bolt
Gasket
Bolt
Gasket
1/32"
1/16"
1/8"
Size
of
of Bolts Torque
Stress
Torque
Stress
Torque
Stress
Thick Thick
Thick
(inches) Bolts (inches) (ft. lbs.)
(psi)
(ft. lbs.)
(psi)
(ft. lbs.)
(psi)
(psi)
(psi)
(psi)
0.5
4
0.50
30
1,929
60
3,857
75
4,821
2,500
3,600
4,800
0.75
4
0.50
30
1,557
60
3,114
75
3,893
2,500
3,600
4,800
1
4
0.50
30
1,302
60
2,605
75
3,256
2,500
3,600
4,800
1.25
4
0.50
30
1,125
60
2,250
75
2,813
2,500
3,600
4,800
1.5
4
0.50
30
973
60
1,946
75
2,432
2,500
3,600
4,800
2
4
0.63
60
1,100
120
2,201
150
2,751
2,500
3,600
4,800
2.5
4
0.63
60
803
120
1,606
150
2,008
2,500
3,600
4,800
3
4
0.63
60
740
120
1,479
150
1,849
2,500
3,600
4,800
3.5
8
0.63
60
1,194
120
2,388
150
2,985
2,500
3,600
4,800
4
8
0.63
60
1,099
120
2,197
150
2,746
2,500
3,600
4,800
5
8
0.75
100
1,466
200
2,931
250
3,664
2,500
3,600
4,800
6
8
0.75
100
1,299
200
2,598
250
3,247
2,500
3,600
4,800
8
8
0.75
100
906
200
1,813
250
2,266
2,500
3,600
4,800
10
12
0.88
160
1,497
320
2,993
400
3,742
2,500
3,600
4,800
12
12
0.88
160
1,031
320
2,062
400
2,577
2,500
3,600
4,800
14
12
1.00
245
1,099
490
2,198
613
2,748
2,500
3,600
4,800
16
16
1.00
245
1,220
490
2,440
613
3,050
2,500
3,600
4,800
18
16
1.13
355
1,613
710
3,226
888
4,033
2,500
3,600
4,800
20
20
1.13
355
1,713
710
3,425
888
4,282
2,500
3,600
4,800
24
20
1.25
500
1,730
1,000
3,460
1,250
4,326
2,500
3,600
4,800
26
24
1.25
500
1,886
1,000
3,771
1,250
4,714
—
4,049
5,249
28
28
1.25
500
2,006
1,000
4,012
1,250
5,015
—
4,075
5,275
30
28
1.25
500
1,811
1,000
3,622
1,250
4,528
—
4,092
5,292
32
28
1.50
800
2,329
1,600
4,659
2,000
5,823
—
4,076
5,276
34
32
1.50
800
2,550
1,600
5,099
2,000
6,374
—
4,115
5,315
36
32
1.50
800
2,335
1,600
4,670
2,000
5,838
—
4,129
5,329
38
32
1.50
800
2,025
1,600
4,050
2,000
5,063
—
4,111
5,311
40
36
1.50
800
2,194
1,600
4,389
2,000
5,486
—
4,145
5,345
42
36
1.50
800
2,034
1,600
4,068
2,000
5,085
—
4,157
5,357
44
40
1.50
800
2,124
1,600
4,247
2,000
5,309
—
4,175
5,375
46
40
1.50
800
2,033
1,600
4,066
2,000
5,083
—
4,201
5,401
48
44
1.50
800
2,108
1,600
4,217
2,000
5,271
—
4,217
5,417
50
44
1.75
1,500
2,873
3,000
5,746
3,750
7,182
—
4,247
5,447
52
44
1.75
1,500
2,690
3,000
5,379
3,750
6,724
—
4,256
5,456
54
44
1.75
1,500
2,525
3,000
5,050
3,750
6,313
—
4,264
5,464
56
48
1.75
1,500
2,553
3,000
5,105
3,750
6,381
—
4,262
5,462
58
48
1.75
1,500
2,406
3,000
4,812
3,750
6,015
—
4,269
5,469
60
52
1.75
1,500
2,544
3,000
5,089
3,750
6,361
—
4,299
5,499
Available Gasket Stress vs. Bolt Stress
150# Flat Face Flanges
This table is for information purposes only; see notes below.
Notes:
1
The values shown are not recommended values. The intent of this
table is to illustrate the relationship between bolt torque, bolt stress,
gasket stress, and how these three factors relate to the contact area of
ASME B16.5 & B16.47 Series A flat face flanges.
2
Full face gaskets will typically seal at stresses well below the minimum
recommended values shown. See also “Flanges” on page C-50.
3
Contact Garlock Applications Engineering at 1-800-448-6688 for
further discussions regarding the use of compressed non-asbestos,
GYLON
®
or GRAPH-LOCK
®
products in flat face flanges.
WARNING:
Properties/applications shown throughout this brochure are typical. Your specific applica-
tion should not be undertaken without independent study and evaluation for suitability.
For specific application recommendations consult Garlock. Failure to select the proper
sealing products could result in property damage and/or serious personal injury.
Performance data published in this brochure has been developed from field testing,
customer field reports and/or in-house testing.
While the utmost care has been used in compiling this brochure, we assume no respon-
sibility for errors. Specifications subject to change without notice. This edition cancels
all previous issues. Subject to change without notice.
GARLOCK is a registered trademark for packings, seals, gaskets, and other products
of Garlock.