ASME B16.5 Blind Flange Dimensions
Blind flanges, in terms of appearance, are generally classified into plate-type flat blind flanges, figure-eight blind flanges, insert flanges, and gaskets (insert flanges and gaskets are mutually blind-connected). Blind flanges serve the same function as end caps, pipe caps, and welded plugs, providing isolation and shut-off. Due to their good sealing performance, they are generally used as a reliable isolation method for systems requiring complete isolation. A plate-type flat blind flange is simply a solid circle with a handle, used in systems that are normally isolated. A figure-eight blind flange, shaped like the number 8, has a blind flange at one end and a throttling ring at the other, but its diameter is the same as the pipe diameter and it does not perform a throttling function. Figure-eight blind flanges are convenient to use; the blind flange end is used when isolation is needed, and the throttling ring end is used when normal operation is required. They can also be used to fill the installation gaps of blind flanges in pipelines. Another feature is their clear markings, making it easy to identify the installation status.
ASME B16.5 Welding Neck Flanges Class 150LBS Dimensions
|
NPS
|
D
|
L
|
Holes
|
B
|
G
|
Weight
|
|
1/2″
|
89
|
15.7
|
4
|
11.2
|
35.1
|
0.5
|
|
3/4″
|
99
|
15.7
|
4
|
12.7
|
42.9
|
0.8
|
|
1″
|
108
|
15.7
|
4
|
14.2
|
50.8
|
0.85
|
|
1-1/4″
|
117
|
15.7
|
4
|
15.7
|
63.5
|
1.4
|
|
1-1/2″
|
127
|
15.7
|
4
|
17.5
|
73.2
|
1.7
|
|
2″
|
152
|
19.1
|
4
|
19.1
|
91.9
|
2.3
|
|
2-1/2″
|
178
|
19.1
|
4
|
22.4
|
104.6
|
3.2
|
|
3″
|
191
|
19.1
|
4
|
23.9
|
127
|
4.1
|
|
3-1/2″
|
216
|
19.1
|
8
|
23.9
|
139.7
|
5.9
|
|
4″
|
229
|
19.1
|
8
|
23.9
|
157.2
|
7.5
|
|
5″
|
254
|
22.4
|
8
|
23.9
|
185.7
|
9
|
|
6″
|
279
|
22.4
|
8
|
25.4
|
215.9
|
11.5
|
|
8″
|
343
|
22.4
|
8
|
28.4
|
269.7
|
20.2
|
|
10″
|
406
|
25.4
|
12
|
30.2
|
323.9
|
29
|
|
12″
|
483
|
25.4
|
12
|
31.8
|
381
|
43.5
|
|
14″
|
533
|
28.4
|
12
|
35.1
|
412.8
|
58.5
|
|
16″
|
597
|
28.4
|
16
|
36.6
|
469.9
|
76.5
|
|
18″
|
635
|
31.8
|
16
|
39.6
|
533.4
|
93.5
|
|
20″
|
699
|
31.8
|
20
|
42.9
|
584.2
|
122.5
|
|
24″
|
813
|
35.1
|
20
|
47.8
|
692.2
|
185
|
ASME B16.5 Blind Flange Class 300 LBS Dimensions
|
NPS
|
D
|
L
|
Holes
|
B
|
G
|
Weight
|
|
1/2″
|
95
|
15.7
|
4
|
14.2
|
35.1
|
0.90
|
|
3/4″
|
117
|
19.1
|
4
|
15.7
|
42.9
|
1.20
|
|
1″
|
124
|
19.1
|
4
|
17.5
|
50.8
|
1.30
|
|
1-1/4″
|
133
|
19.1
|
4
|
19.1
|
63.5
|
1.70
|
|
1-1/2″
|
155
|
22.4
|
4
|
20.6
|
73.2
|
2.60
|
|
2″
|
165
|
19.1
|
8
|
22.1
|
91.9
|
3.20
|
|
2-1/2″
|
191
|
22.4
|
8
|
25.4
|
104.6
|
4.85
|
|
3″
|
210
|
22.4
|
8
|
28.4
|
127
|
6.75
|
|
3-1/2″
|
229
|
22.4
|
8
|
30.2
|
139.7
|
8.70
|
|
4″
|
254
|
22.4
|
8
|
31.8
|
157.2
|
11.50
|
|
5″
|
279
|
22.4
|
8
|
35.1
|
185.7
|
15.60
|
|
6″
|
318
|
22.4
|
12
|
36.6
|
215.9
|
20.86
|
|
8″
|
381
|
25.4
|
12
|
41.1
|
269.7
|
34.20
|
|
10″
|
445
|
28.4
|
16
|
47.8
|
323.9
|
53.50
|
|
12″
|
521
|
31.8
|
16
|
50.8
|
381
|
78.80
|
|
14″
|
584
|
31.8
|
20
|
53.8
|
412.8
|
105.00
|
|
16″
|
648
|
35.1
|
20
|
57.2
|
469.9
|
134.00
|
|
18″
|
711
|
35.1
|
24
|
60.5
|
533.4
|
172.00
|
|
20″
|
775
|
35.1
|
24
|
63.5
|
584.2
|
270.00
|
|
24″
|
914
|
41.1
|
24
|
69.9
|
692.2
|
339.60
|
|
NPS
|
D
|
L
|
Holes
|
B
|
G
|
Weight
|
|
1/2″
|
95
|
16
|
4
|
14.2
|
34.9
|
0.75
|
|
3/4″
|
117
|
19
|
4
|
15.7
|
42.9
|
1.26
|
|
1″
|
124
|
19
|
4
|
17.5
|
50.8
|
1.6
|
|
1-1/4″
|
133
|
19
|
4
|
20.6
|
63.5
|
2.22
|
|
1-1/2″
|
155
|
22
|
4
|
22.4
|
73
|
3.26
|
|
2″
|
165
|
19
|
8
|
25.4
|
92.1
|
4.14
|
|
2-1/2″
|
191
|
22
|
8
|
28.4
|
104.8
|
6.14
|
|
3″
|
210
|
22
|
8
|
31.8
|
127
|
8.52
|
|
3-1/2″
|
229
|
25
|
8
|
35.1
|
139.7
|
11.03
|
|
4″
|
254
|
25
|
8
|
35.1
|
157.2
|
13.85
|
|
5″
|
279
|
25
|
8
|
38.1
|
185.7
|
18.46
|
|
6″
|
318
|
25
|
12
|
41.1
|
215.9
|
25.55
|
|
8″
|
381
|
29
|
12
|
47.8
|
269.9
|
42.66
|
|
10″
|
445
|
32
|
16
|
55.8
|
323.8
|
66.59
|
|
12″
|
521
|
35
|
16
|
57.2
|
381
|
94.5
|
|
14″
|
584
|
35
|
20
|
60.5
|
412.8
|
124.75
|
|
16″
|
648
|
39
|
20
|
63.5
|
469.9
|
161.13
|
|
18″
|
710
|
39
|
24
|
66.5
|
533.4
|
202.85
|
|
20″
|
775
|
42
|
24
|
69.9
|
584.2
|
253.96
|
|
24″
|
914
|
48
|
24
|
76.2
|
692.2
|
385.25
|
|
NPS
|
D
|
L
|
Holes
|
B
|
G
|
Weight
|
|
1/2″
|
121
|
23
|
4
|
22.4
|
34.9
|
1.78
|
|
3/4″
|
130
|
23
|
4
|
25.4
|
42.9
|
2.39
|
|
1″
|
149
|
26
|
4
|
28.4
|
50.8
|
3.51
|
|
1-1/4″
|
159
|
26
|
4
|
28.4
|
63.5
|
4.11
|
|
1-1/2″
|
178
|
29
|
4
|
31.8
|
73
|
5.76
|
|
2″
|
216
|
26
|
8
|
38.1
|
92.1
|
10.02
|
|
2-1/2″
|
244
|
29
|
8
|
41.1
|
104.8
|
13.81
|
|
3″
|
241
|
26
|
8
|
38.1
|
127
|
13.00
|
|
3-1/2″
|
8
|
|||||
|
4″
|
292
|
32
|
8
|
44.5
|
157.2
|
22.12
|
|
5″
|
349
|
35
|
8
|
50.8
|
185.7
|
36.43
|
|
6″
|
381
|
32
|
12
|
55.6
|
215.9
|
47.37
|
|
8″
|
470
|
39
|
12
|
63.5
|
269.9
|
82.19
|
|
10″
|
546
|
39
|
16
|
69.9
|
323.8
|
122.09
|
|
12″
|
610
|
39
|
20
|
79.2
|
381
|
172.52
|
|
14″
|
641
|
42
|
20
|
85.9
|
412.8
|
205.59
|
|
16″
|
705
|
45
|
20
|
88.9
|
469.9
|
258.86
|
|
18″
|
787
|
51
|
20
|
101.6
|
533.4
|
366.53
|
|
20″
|
857
|
54
|
20
|
108
|
584.2
|
463.57
|
|
24″
|
1041
|
67
|
20
|
139.7
|
692.2
|
874.81
|
|
NPS
|
D
|
L
|
Holes
|
B
|
G
|
Weight
|
|
1/2″
|
121
|
23
|
4
|
22.4
|
34.9
|
1.78
|
|
3/4″
|
130
|
23
|
4
|
25.4
|
42.9
|
2.39
|
|
1″
|
149
|
26
|
4
|
28.4
|
50.8
|
3.51
|
|
1-1/4″
|
159
|
26
|
4
|
28.4
|
63.5
|
4.11
|
|
1-1/2″
|
178
|
29
|
4
|
31.3
|
73
|
5.68
|
|
2″
|
216
|
26
|
8
|
38.1
|
92.1
|
10.02
|
|
2-1/2″
|
244
|
29
|
8
|
41.1
|
104.3
|
13.81
|
|
3″
|
267
|
32
|
8
|
47.3
|
127
|
19.03
|
|
3-1/2″
|
0
|
0
|
8
|
0
|
0
|
0
|
|
4″
|
311
|
35
|
8
|
53.8
|
157.2
|
29.8
|
|
5″
|
375
|
42
|
8
|
73.2
|
185.7
|
58.45
|
|
6″
|
394
|
39
|
12
|
82.6
|
215.9
|
71.58
|
|
8″
|
483
|
45
|
12
|
91.9
|
269.9
|
121.26
|
|
10″
|
584
|
51
|
12
|
108
|
323.8
|
210.41
|
|
12″
|
673
|
54
|
16
|
124
|
381
|
316.28
|
|
14″
|
749
|
61
|
16
|
133.4
|
412.8
|
419.11
|
|
16″
|
826
|
67
|
16
|
146.1
|
469.9
|
558.51
|
|
18″
|
914
|
74
|
16
|
162.1
|
533.4
|
758.48
|
|
20″
|
984
|
80
|
16
|
177.8
|
584.2
|
962.51
|
|
24″
|
1168
|
93
|
16
|
203.2
|
692.2
|
1554.5
|
|
NPS
|
D
|
L
|
Holes
|
B
|
G
|
Weight
|
|
1/2″
|
133
|
23
|
4
|
30.2
|
34.9
|
2.91
|
|
3/4″
|
140
|
23
|
4
|
31.8
|
42.9
|
3.45
|
|
1″
|
159
|
26
|
4
|
35.1
|
50.8
|
4.91
|
|
1-1/4″
|
184
|
29
|
4
|
38.1
|
63.5
|
7.2
|
|
1-1/2″
|
203
|
32
|
4
|
44.5
|
73
|
10.23
|
|
2″
|
235
|
29
|
8
|
50.8
|
92.1
|
15.27
|
|
2-1/2″
|
267
|
32
|
8
|
57.2
|
104.8
|
22.36
|
|
3″
|
305
|
35
|
8
|
66.5
|
127
|
34.28
|
|
3-1/2″
|
0
|
0
|
8
|
0
|
0
|
0
|
|
4″
|
356
|
42
|
8
|
76.8
|
157.2
|
53.57
|
|
5″
|
419
|
48
|
8
|
91.5
|
185.7
|
88.98
|
|
6″
|
483
|
54
|
8
|
108
|
215.9
|
140.26
|
|
8″
|
552
|
54
|
12
|
127
|
269.9
|
211.9
|
|
10″
|
673
|
67
|
12
|
165.1
|
323.8
|
407.24
|
|
12″
|
762
|
74
|
12
|
184.2
|
381
|
586.22
|
GOST 12820 Steel Plate Flanges
DIN2573 PN6 Plate Flange
GOST 12836 Blind Flange Dimensions PN40 4.0Mpa
