ASME Standardised Flanges

ASME Standardised Flanges

ASME B16 standards covers pipes and fittings made from cast or forged materials.

The ASME B16.5 pipe flanges and flange fittings standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings.

Piping flanges are popular in shapes of lapped, reducing, butt or socket welded, threaded or screwed, plate, blind, spectable and so on, among which Slip-on to weld is one of the most popular ways that benefits from low cost of fabrication and easy handling with less requirement of accuracy in operation.

slip on flanges

Slip-On Flanges

Slip-on flanges are one of the most popular types in use. They are the type that slides over to the end of piping and requires less accuracy in positioning to weld thus fits for a much wider ranges of pipes lines. Smaller thickness allows for easier alignment of bolting holes.

welding neck flanges

Welding Neck Flanges

Welding neck flanges are the type that is joined to piping by butt welding end of the long neck, thickness transition along which gives it reinforcement under higher stress.

socket welding flanges

Socket Welding Flanges

Looking alike slip-on flanges, socket welding ones have smooth counterbore to the intended piping maximizing flow capacity. Great pressure understake can be achieved in this type of connection as the fatigue strength is 50% greater than double-weld slip-on flanges.

threaded flanges

Threaded Flanges

Threaded flanges are those with internal threads, being connected by screwing in pipes with matching external threads instead of high-temp welding. It is advisory to weld both rims after threaded though in no cases this type should be used for pressure piping.

lap joint flanges

Lap Joint Flanges

Lap joint flanges are used commonly together with Stub-end fittings which frees flanges from being bolted and fixed in position. When the fitting is welded to piping, lap joint flange is easy to be slipped on, rotated thus can be frequently mounted and dismounted.

blind flanges

Blind Flanges

A blind flange is a solid disk used to block off a pipeline or to create a stop. The blind flange is machined in the same manner as a regular flange with the mounting holes around the perimeter and the gasket sealing rings machined into the mating surface.

steel piping asme b36.10

Steel Piping ASME B36.10

Welded and seamless piping of carbon and alloy steels are at options for ASME flanges Class 600 and 900 according to specs below.

Norminal
Piping
Outside
Ø
mm
Inside
Ø
mm
Sch
5
Sch
10
Sch
20
Sch
30
Stand-
ard
Sch
40
Sch
60
Sch
XS
Sch
80
Sch
100
Sch
120
Sch
140
Sch
160
Sch
XXS
inch mm Wall
Thickness
mm
1/8 6 10.3 I.D - 7.8 - 7.4 6.8 6.8 - 5.5 5.5 - - - - -
1/8 6 10.3 W.T - 1.2 - 1.5 1.7 1.7 - 2.4 2.4 - - - - -
1/4 8 13.7 I.D - 10.4 - 10.0 9.2 9.2 - 7.7 7.7 - - - - -
1/4 8 13.7 W.T - 1.7 - 1.9 2.2 2.2 - 3.0 3.0 - - - - -
3/8 10 17.1 I.D - 13.8 - 13.4 12.5 12.5 - 10.7 10.7 - - - - -
3/8 10 17.1 W.T - 1.7 - 1.9 2.3 2.3 - 3.2 3.2 - - - - -
1/2 15 21.3 I.D 18.0 17.1 - 16.5 15.8 15.8 - 13.8 13.8 - - - 11.7 6.4
1/2 15 21.3 W.T 1.7 2.1 - 2.4 2.8 2.8 - 3.7 3.7 - - - 4.8 7.5
3/4 20 26.7 I.D 23.4 22.5 - 21.9 21.0 21.0 - 18.9 18.9 - - - 15.6 11.1
3/4 20 26.7 W.T 1.7 2.1 - 2.4 2.9 2.9 - 3.9 3.9 - - - 5.6 7.8
1 25 33.4 I.D 30.1 27.9 - 27.6 26.6 26.6 - 24.3 24.3 - - - 20.7 15.2
1 25 33.4 W.T 1.7 2.8 - 2.9 3.4 3.4 - 4.6 4.6 - - - 6.4 9.1
32 42.2 I.D 38.9 36.7 - 36.3 35.1 35.1 - 32.5 32.5 - - - 29.5 22.8
32 42.2 W.T 1.7 2.8 - 3.0 3.6 3.6 - 4.9 4.9 - - - 6.4 9.7
40 48.3 I.D 45.0 42.8 - 41.9 40.9 40.9 - 38.1 38.1 - - - 34.0 28.0
40 48.3 W.T 1.7 2.8 - 3.2 3.7 3.7 - 5.1 5.1 - - - 7.1 10.2
2 50 60.3 I.D 57.0 54.8 - 53.9 52.5 52.5 - 49.2 49.2 - - - 42.8 38.2
2 50 60.3 W.T 1.7 2.8 - 3.2 3.9 3.9 - 5.5 5.5 - - - 8.7 11.1
65 73.0 I.D 68.8 66.9 - 63.4 62.7 62.7 - 59.0 59.0 - - - 53.9 45.0
65 73.0 W.T 2.1 3.1 - 4.8 5.2 5.2 - 7.0 7.0 - - - 9.5 14.0
3 80 88.9 I.D 84.7 82.8 - 79.3 77.9 77.9 - 73.7 73.7 - - - 66.6 58.4
3 80 88.9 W.T 2.1 3.1 - 4.8 5.5 5.5 - 7.6 7.6 - - - 11.1 15.2
90 101.6 I.D 97.4 95.5 - 92.0 90.1 90.1 - 85.4 85.4 - - - - -
90 101.6 W.T 2.1 3.1 - 4.8 5.7 5.7 - 8.1 8.1 - - - - -
4 100 114.3 I.D 110.1 108.2 - 104.7 102.3 102.3 - 97.2 97.2 - 92.0 - 87.3 80.1
4 100 114.3 W.T 2.1 3.1 - 4.8 6.0 6.0 - 8.6 8.6 - 11.1 - 13.5 17.1
5 125 141.3 I.D 135.8 134.5 - - 128.2 128.2 - 122.2 122.2 - 115.9 - 109.5 103.2
5 125 141.3 W.T 2.8 3.4 - - 6.6 6.6 - 9.5 9.5 - 12.7 - 15.9 19.1
6 150 168.3 I.D 162.8 161.5 - - 154.1 154.1 - 146.4 146.4 - 139.8 - 131.8 124.4
6 150 168.3 W.T 2.8 3.4 - - 7.1 7.1 - 11.0 11.0 - 14.3 - 18.3 22.0
8 200 219.1 I.D 213.6 211.6 206.4 205.0 202.7 202.7 198.5 193.7 193.7 188.9 182.6 177.9 173.1 174.6
8 200 219.1 W.T 2.8 3.8 6.4 7.0 8.2 8.2 10.3 12.7 12.7 15.1 18.3 20.6 23.0 22.2
10 250 273.0 I.D 266.2 264.6 260.3 257.4 254.5 254.5 247.6 247.6 242.8 236.5 230.1 222.2 215.8 222.2
10 250 273.0 W.T 3.4 4.2 6.4 7.8 9.3 9.3 12.7 12.7 15.1 18.3 21.4 25.4 28.6 25.4
12 300 323.8 I.D 315.9 314.7 311.1 307.0 304.7 303.2 295.3 298.4 288.8 280.9 273.0 266.6 257.2 273.0
12 300 323.8 W.T 4.0 4.6 6.4 8.4 9.5 10.3 14.3 12.7 17.5 21.4 25.4 28.6 33.3 25.4
14 350 355.6 I.D 347.7 342.9 339.8 336.5 336.5 333.3 325.4 330.2 317.5 307.9 300.0 292.1 284.2 -
14 350 355.6 W.T 4.0 3.7 7.9 9.5 9.5 11.1 15.1 12.7 19.1 23.8 27.8 31.8 35.7 -
16 400 406.4 I.D 398.0 393.7 390.6 387.3 387.3 381.0 373.1 381.0 363.5 354.0 344.5 333.3 325.4 -
16 400 406.4 W.T 4.2 6.4 7.9 9.5 9.5 12.7 16.7 12.7 21.4 26.2 31.0 36.5 40.5 -
18 450 457.0 I.D 448.6 444.3 441.2 434.7 437.9 428.5 418.9 431.6 409.3 398.3 387.1 377.7 366.5 -
18 450 457.0 W.T 4.2 6.4 7.9 11.1 9.5 14.3 19.1 12.7 23.8 29.4 34.9 39.7 45.2 -
20 500 508.0 I.D 498.4 495.3 488.9 482.6 488.9 477.8 466.9 482.6 455.6 442.9 431.8 419.1 408.0 -
20 500 508.0 W.T 4.8 6.4 9.5 12.7 9.5 15.1 20.6 12.7 26.2 32.5 38.1 44.5 50.0 -
22 550 559.0 I.D 549.4 546.3 539.9 533.6 539.9 - 514.5 533.6 501.8 489.1 476.4 463.7 451.0 -
22 550 559.0 W.T 4.8 6.4 9.5 12.7 9.5 - 22.2 12.7 28.6 34.9 41.3 47.6 54.0 -
24 600 610.0 I.D 598.9 597.3 590.9 581.5 590.9 575.0 560.8 584.6 548.1 532.2 518.0 505.3 490.9 -
24 600 610.0 W.T 5.5 6.4 9.5 14.3 9.5 17.5 24.6 12.7 31.0 38.9 46.0 52.4 59.5 -
stainless steel piping asme b36.19

Stainless Steel Piping ASME B36.19

Welded and seamless piping of stainless steels are at options for ASME flanges Class 600 and 900 according to specs below.

Norminal
Piping
Outside
Ø
mm
Inside
Ø
mm
Sch
5S
Sch
10S
Sch
40S
Sch
80S
inch mm Wall
Thickness
mm
1/8 6 10.3 I.D - 7.8 6.8 5.5
1/8 6 10.3 W.T - 1.2 1.7 2.4
1/4 8 13.7 I.D - 10.4 9.2 7.7
1/4 8 13.7 W.T - 1.7 2.2 3.0
3/8 10 17.1 I.D - 13.8 12.5 10.7
3/8 10 17.1 W.T - 1.7 2.3 3.2
1/2 15 21.3 I.D 18.0 17.1 15.8 13.8
1/2 15 21.3 W.T 1.7 2.1 2.8 3.7
3/4 20 26.7 I.D 23.4 22.5 21.0 18.9
3/4 20 26.7 W.T 1.7 2.1 2.9 3.9
1 25 33.4 I.D 30.1 27.9 26.6 24.3
1 25 33.4 W.T 1.7 2.8 3.4 4.6
32 42.2 I.D 38.9 36.7 35.4 32.5
32 42.2 W.T 1.7 2.8 3.6 4.9
40 48.3 I.D 45.0 42.8 40.9 38.1
40 48.3 W.T 1.7 2.8 3.7 5.1
2 50 60.3 I.D 57.0 54.8 52.5 49.2
2 50 60.3 W.T 1.7 2.8 3.9 5.5
65 73.0 I.D 68.8 66.9 62.7 59.0
65 73.0 W.T 2.1 3.4 5.2 7.0
3 80 88.9 I.D 84.7 82.8 77.9 73.7
3 80 88.9 W.T 2.1 3.1 5.5 7.6
90 101.6 I.D 97.4 95.5 90.1 85.4
90 101.6 W.T 2.1 3.1 5.7 8.1
4 100 114.3 I.D 110.1 108.2 102.3 97.2
4 100 114.3 W.T 2.1 3.1 6.0 8.6
5 125 141.3 I.D 135.8 134.5 128.2 122.2
5 125 141.3 W.T 2.8 3.4 6.6 9.5
6 150 168.3 I.D 162.8 161.5 154.1 146.4
6 150 168.3 W.T 2.8 3.4 7.1 11.0
8 200 219.1 I.D 213.6 211.6 202.7 193.7
8 200 219.1 W.T 2.8 3.8 8.2 12.7
10 250 273.0 I.D 266.2 264.7 254.6 247.7
10 250 273.0 W.T 3.4 4.2 9.3 12.7
12 300 323.8 I.D 315.9 378.8 304.8 298.5
12 300 323.8 W.T 4.0 4.6 9.5 12.7
14 350 355.6 I.D 347.7 346.0 - -
14 350 355.6 W.T 4.0 4.8 - -
16 400 406.4 I.D 398.0 396.8 - -
16 400 406.4 W.T 4.2 4.8 - -
18 450 457.0 I.D 448.6 447.4 - -
18 450 457.0 W.T 4.2 4.8 - -
20 500 508.0 I.D 498.4 496.9 - -
20 500 508.0 W.T 4.8 5.5 - -
22 550 559.0 I.D 549.4 547.9 - -
22 550 559.0 W.T 4.8 5.5 - -
24 600 610.0 I.D 598.9 597.3 - -
24 600 610.0 W.T 5.5 6.35 - -

Flanges Materials ASTM

Flanges per ASME B16.5 are basically formed by forging techniques according to ASTM specs, grade or code of which are supposed to be visually identified on bodies in all cases.

ASTM Grade Chem Chemical Composition (%) Mechanical Properties
C Mn P
Max
S
Max
Si Ni Cr Mo T.S psi
Min
(kg/mm2)
Y.S psi
Min
(kg/mm2)
EL %
Min
Red %
Min
HB
A105 - Carbon
Steel
Max
0.35
1.16-
1.05
0.040 0.050 Max
0.35
Max
0.40
Max
0.30
Max
0.12
70.000
(49.2)
36.000
(25.3)
22 30 Max
187
A181 60 Carbon
Steel
Max
0.35
Max
0.90
0.050 0.050 Max
0.35
- - - 60.000
(42.2)
30.000
(21.1)
22 35 Max
187
A181 70 Carbon
Steel
Max
0.35
Max
0.90
0.050 0.050 Max
0.35
- - - 70.000
(49.2)
36.000
(25.3)
18 24 Max
187
A182 F1 1/2Mo Max
0.28
0.60-
0.90
0.045 0.045 0.15-
0.35
- - 0.44-
0.65
70.000
(49.2)
40.000
(28.1)
20 30 143-
192
A182 F5 5Cr-
½Mo
Max
0.15
0.30-
0.60
0.030 0.030 Max
0.50
Max
0.50
4.00-
6.00
0.44-
0.65
70.000
(49.2)
40.000
(28.1)
20 35 143-
217
A182 F5a 5Cr-
½Mo
Max
0.25
Max
0.60
0.040 0.030 Max
0.50
Max
0.50
4.00-
6.00
0.44-
0.65
90.000
(63.3)
65.000
(45.7)
22 50 187-
248
A182 F11-1 1¼Cr-
½Mo
0.05-
0.15
0.30-
0.60
0.030 0.030 0.50-
1.00
- 1.00-
1.50
0.44-
0.65
60.000
(42.2)
30.000
(21.1)
20 45 121-
174
A182 F11-2 1¼Cr-
½Mo
0.10-
0.20
0.30-
0.80
0.040 0.040 0.50-
1.00
- 1.00-
1.50
0.44-
0.65
70.000
(49.2)
40.000
(28.1)
20 30 143-
207
A182 F11-3 1¼Cr-
½Mo
0.10-
0.20
0.30-
0.80
0.040 0.040 0.50-
1.00
- 1.00-
1.50
0.44-
0.65
75.000
(52.7)
45.000
(31.6)
20 30 156-
207
A182 F12-1 1Cr-
½Mo
0.05-
0.15
0.30-
0.60
0.045 0.045 Max
0.50
- 0.80-
1.25
0.44-
0.65
60.000
(42.2)
30.000
(21.1)
20 45 121-
174
A182 F12-2 1Cr-
½Mo
0.10-
0.20
0.30-
0.80
0.040 0.040 0.10-
0.60
- 0.80-
1.25
0.44-
0.65
70.000
(49.2)
40.000
(28.1)
20 30 143-
207
A182 F11 1¼Cr-
½Mo
0.10-
0.20
0.30-
0.60
0.040 0.040 0.50-
1.00
- 1.00-
1.50
0.44-
0.65
70.000
(49.2)
40.000
(28.1)
20 30 143-
207
A182 F12 1Cr-
½Mo
0.10-
0.20
0.30-
0.80
0.040 0.040 0.10-
0.60
- 0.80-
1.25
0.44-
0.65
70.000
(49.2)
40.000
(28.1)
20 30 143-
207
A182 F22 2¼Cr-
½Mo
Max
0.15
0.30-
0.60
0.040 0.040 Max
0.50
- 2.00-
2.50
0.87-
1.13
75.000
(52.7)
45.000
(31.6)
20 30 156-
207
A182 F304 18Cr-
8Ni
Max
0.08
Max
2.00
0.040 0.030 Max
1.00
8.00-
11.00
18.00-
20.00
- 75.000
(52.7)
30.000
(21.1)
30 50 -
A182 F304L 18Cr-
8Ni Low
Max
0.035
Max
2.00
0.040 0.030 Max
1.00
8.00-
13.00
18.00-
20.00
- 70.000
(49.2)
25.000
(17.6)
30 50 -
A182 F316 18Cr-
8Ni Mo
Max
0.08
Max
2.00
0.040 0.030 Max
1.00
10.00-
14.00
16.00-
18.00
2.00-
3.00
75.000
(52.7)
30.000
(21.7)
30 50 -
A182 F316L 18Cr-
8Ni Mo
Low
Max
0.035
Max
2.00
0.040 0.030 Max
1.00
10.00-
15.00
16.00-
18.00
2.00-
3.00
65.000
(45.7)
25.000
(17.6)
30 50 -
A182 F321 18Cr-
8Ni Ti
Max
0.08
Max
2.00
0.030 0.030 Max
1.00
9.00-
12.00
Min
17.00
- 75.000
(52.7)
30.000
(21.1)
30 50 -
A182 F347 18Cr-
8Ni Cb
Max
0.08
Max
2.00
0.030 0.030 Max
1.00
9.00-
13.00
17.00-
20.00
- 75.000
(52.7)
30.000
(21.1)
30 50 -
A350 LF1 Carbon
Steel
Max
0.30
0.75-
1.05
0.035 0.040 0.15-
0.30
Max
0.40
Max
0.30
Max
0.12
60.000-
85.000
(42.2-
59.7)
30.000
(21.1)
25 38 -
A350 LF2 Carbon
Steel
Max
0.30
Max
1.35
0.035 0.040 0.15-
0.30
Max
0.40
Max
0.30
Max
0.12
70.000-
95.000
(49.2-
66.8)
36.000
(25.3)
22 30 -
A350 LF3 3½Ni Max
0.20
Max
0.90
0.035 0.040 0.20-
0.35
3.25-
3.75
Max
0.30
Max
0.12
70.000-
95.000
(49.2-
66.8)
37.500
(26.4)
22 35 -
flanges asme