Long Neck Welding (abbreviated LWN) flanges are similar to a standard Welding Neck flange, but the “Neck” is considerably longer. This type is often used as a nozzle for a barrel or column. In addition, there are the type LWN Heavy Barrel (HB) and the Equal LWN Barrel (E); they have a different shape and a thicker “Wall”.
|
ASME B16.5 Long Weld Neck Flange Class 150 LBS Dimensions
|
||||||||
|
NPS
|
O
|
Tf
|
X
|
B
|
Y
|
W
|
BH
|
Holes
|
|
1/2″
|
88.9
|
9.7
|
30.2
|
12.7
|
228.6
|
60.5
|
15.9
|
4
|
|
3/4″
|
98.6
|
11.2
|
38.1
|
19.1
|
228.6
|
69.9
|
15.9
|
4
|
|
1″
|
108.0
|
12.7
|
49.3
|
25.4
|
228.6
|
79.2
|
15.9
|
4
|
|
1-1/4″
|
117.5
|
14.2
|
58.7
|
31.8
|
228.6
|
88.9
|
15.9
|
4
|
|
1-1/2″
|
127.0
|
15.7
|
65.0
|
38.1
|
228.6
|
98.6
|
15.9
|
4
|
|
2″
|
152.4
|
17.5
|
77.7
|
50.8
|
228.6
|
120.7
|
19.1
|
4
|
|
2-1/2″
|
177.8
|
20.6
|
90.4
|
63.5
|
228.6
|
139.7
|
19.1
|
4
|
|
3″
|
190.5
|
22.4
|
108.0
|
76.2
|
228.6
|
152.4
|
19.1
|
4
|
|
3-1/2″
|
215.9
|
22.4
|
122.2
|
88.9
|
228.6
|
177.8
|
19.1
|
8
|
|
4″
|
228.6
|
22.4
|
134.9
|
101.6
|
228.6
|
190.5
|
19.1
|
8
|
|
5″
|
254.0
|
22.4
|
163.6
|
127.0
|
304.8
|
215.9
|
22.2
|
8
|
|
6″
|
279.4
|
23.9
|
192.0
|
152.4
|
304.8
|
241.3
|
22.2
|
8
|
|
8″
|
342.9
|
26.9
|
246.1
|
203.2
|
304.8
|
298.5
|
22.2
|
8
|
|
10″
|
406.4
|
28.4
|
304.8
|
254.0
|
304.8
|
362.0
|
12
|
|
|
12″
|
482.6
|
30.2
|
365.3
|
304.8
|
304.8
|
431.8
|
25.4
|
12
|
|
14″
|
533.4
|
33.3
|
400.1
|
355.6
|
304.8
|
476.3
|
28.6
|
12
|
|
16″
|
596.9
|
35.1
|
457.2
|
406.4
|
304.8
|
539.8
|
28.6
|
16
|
|
18″
|
635.0
|
38.1
|
505.0
|
457.2
|
304.8
|
577.9
|
31.8
|
16
|
|
20″
|
698.5
|
41.1
|
558.8
|
508.0
|
304.8
|
635.0
|
31.8
|
20
|
|
24″
|
812.8
|
46.0
|
663.4
|
609.6
|
304.8
|
749.3
|
34.9
|
20
|
|
ASME B16.5 Long Weld Neck Flange Class 300 LBS Dimensions
|
||||||||
|
NPS
|
O
|
Tf
|
X
|
B
|
Y
|
W
|
BH
|
Holes
|
|
1/2″
|
95.3
|
12.7
|
38.1
|
12.7
|
228.6
|
66.5
|
15.9
|
4
|
|
3/4″
|
117.3
|
14.2
|
47.8
|
19.1
|
228.6
|
82.6
|
19.1
|
4
|
|
1″
|
124.0
|
15.7
|
53.8
|
25.4
|
228.6
|
88.9
|
19.1
|
4
|
|
1-1/4″
|
133.4
|
17.5
|
63.5
|
31.8
|
228.6
|
98.6
|
19.1
|
4
|
|
1-1/2″
|
155.4
|
19.1
|
69.9
|
38.1
|
228.6
|
114.3
|
22.2
|
4
|
|
2″
|
165.1
|
20.6
|
84.1
|
50.8
|
228.6
|
127.0
|
19.1
|
8
|
|
2-1/2″
|
190.5
|
23.9
|
100.1
|
63.5
|
228.6
|
149.4
|
22.2
|
8
|
|
3″
|
209.6
|
26.9
|
117.3
|
76.2
|
228.6
|
168.1
|
22.2
|
8
|
|
3-1/2″
|
228.6
|
28.4
|
133.4
|
88.9
|
228.6
|
184.2
|
22.2
|
8
|
|
4″
|
254.0
|
30.2
|
146.1
|
101.6
|
228.6
|
200.2
|
22.2
|
8
|
|
5″
|
279.4
|
33.3
|
177.8
|
127.0
|
304.8
|
235.0
|
22.2
|
8
|
|
6″
|
317.5
|
35.1
|
206.2
|
152.4
|
304.8
|
269.7
|
22.2
|
12
|
|
8″
|
381.0
|
39.6
|
260.4
|
203.2
|
304.8
|
330.2
|
25.4
|
12
|
|
10″
|
444.5
|
46.0
|
320.5
|
254.0
|
304.8
|
387.4
|
28.6
|
16
|
|
12″
|
520.7
|
49.3
|
374.7
|
304.8
|
304.8
|
450.9
|
31.8
|
16
|
|
14″
|
584.2
|
52.3
|
425.5
|
355.6
|
304.8
|
514.4
|
31.8
|
20
|
|
16″
|
647.7
|
55.6
|
482.6
|
406.4
|
304.8
|
571.5
|
34.9
|
20
|
|
18″
|
711.2
|
58.7
|
533.4
|
457.2
|
304.8
|
628.7
|
34.9
|
24
|
|
20″
|
774.7
|
62.0
|
587.2
|
508.0
|
304.8
|
685.8
|
34.9
|
24
|
|
24″
|
914.4
|
68.3
|
701.5
|
609.6
|
304.8
|
812.8
|
41.3
|
24
|
|
ASME B16.5 Long Weld Neck Flange Class 400 LBS Dimensions
|
||||||||
|
NPS
|
O
|
Tf
|
X
|
B
|
Y
|
W
|
BH
|
Holes
|
|
1/2″
|
95.3
|
14.2
|
38.1
|
12.7
|
228.6
|
66.5
|
15.9
|
4
|
|
3/4″
|
117.3
|
15.7
|
47.8
|
19.1
|
228.6
|
82.6
|
19.1
|
4
|
|
1″
|
124
|
17.5
|
53.8
|
25.4
|
228.6
|
88.9
|
19.1
|
4
|
|
1-1/4″
|
133.4
|
20.6
|
63.5
|
31.8
|
228.6
|
98.6
|
19.1
|
4
|
|
1-1/2″
|
155.4
|
22.4
|
69.9
|
38.1
|
228.6
|
114.3
|
22.2
|
4
|
|
2″
|
165.1
|
25.4
|
84.1
|
50.8
|
228.6
|
127
|
19.1
|
8
|
|
2-1/2″
|
190.5
|
28.4
|
100.1
|
63.5
|
228.6
|
149.4
|
22.2
|
8
|
|
3″
|
209.6
|
31.8
|
117.3
|
76.2
|
228.6
|
168.1
|
22.2
|
8
|
|
3-1/2″
|
228.6
|
35.1
|
133.4
|
88.9
|
228.6
|
184.2
|
25.4
|
8
|
|
4″
|
254
|
35.1
|
146.1
|
101.6
|
228.6
|
200.2
|
25.4
|
8
|
|
5″
|
279.4
|
38.1
|
177.8
|
127
|
304.8
|
235
|
25.4
|
8
|
|
6″
|
317.5
|
41.1
|
206.2
|
152.4
|
304.8
|
269.7
|
25.4
|
12
|
|
8″
|
381
|
47.8
|
260.4
|
203.2
|
304.8
|
330.2
|
28.6
|
12
|
|
10″
|
444.5
|
53.8
|
320.5
|
254
|
304.8
|
387.4
|
31.8
|
16
|
|
12″
|
520.7
|
57.2
|
374.7
|
304.8
|
304.8
|
450.9
|
34.9
|
16
|
|
14″
|
584.2
|
60.5
|
425.5
|
355.6
|
304.8
|
514.4
|
34.9
|
20
|
|
16″
|
647.7
|
63.5
|
482.6
|
406.4
|
304.8
|
571.5
|
38.1
|
20
|
|
18″
|
711.2
|
66.5
|
533.4
|
457.2
|
304.8
|
628.7
|
38.1
|
24
|
|
20″
|
774.7
|
69.9
|
587.2
|
508
|
304.8
|
685.8
|
41.3
|
24
|
|
24″
|
914.4
|
76.2
|
701.5
|
609.6
|
304.8
|
812.8
|
47.6
|
24
|
|
ASME B16.5 Long Weld Neck Flange Class 600 LBS Dimensions |
||||||||
|
NPS
|
O
|
Tf
|
X
|
B
|
Y
|
W
|
BH
|
Holes
|
|
1/2″
|
95.3
|
14.2
|
38.1
|
12.7
|
228.6
|
66.5
|
15.9
|
4
|
|
3/4″
|
117.3
|
15.7
|
47.8
|
19.1
|
228.6
|
82.6
|
19.1
|
4
|
|
1″
|
124
|
17.5
|
53.8
|
25.4
|
228.6
|
88.9
|
19.1
|
4
|
|
1-1/4″
|
133.4
|
20.6
|
63.5
|
31.8
|
228.6
|
98.6
|
19.1
|
4
|
|
1-1/2″
|
155.4
|
22.4
|
69.9
|
38.1
|
228.6
|
114.3
|
22.2
|
4
|
|
2″
|
165.1
|
25.4
|
84.1
|
50.8
|
228.6
|
127
|
19.1
|
8
|
|
2-1/2″
|
190.5
|
28.4
|
100.1
|
63.5
|
228.6
|
149.4
|
22.2
|
8
|
|
3″
|
209.6
|
31.8
|
117.3
|
76.2
|
228.6
|
168.1
|
22.2
|
8
|
|
3-1/2″
|
228.6
|
35.1
|
133.4
|
88.9
|
228.6
|
184.2
|
25.4
|
8
|
|
4″
|
273.1
|
38.1
|
152.4
|
101.6
|
228.6
|
215.9
|
25.4
|
8
|
|
5″
|
330.2
|
44.5
|
189
|
127
|
304.8
|
266.7
|
28.6
|
8
|
|
6″
|
355.6
|
47.8
|
222.3
|
152.4
|
304.8
|
292.1
|
28.6
|
12
|
|
8″
|
419.1
|
55.6
|
273.1
|
203.2
|
304.8
|
349.3
|
31.8
|
12
|
|
10″
|
508
|
63.5
|
342.9
|
254
|
304.8
|
431.8
|
34.9
|
16
|
|
12″
|
558.8
|
66.5
|
400.1
|
304.8
|
304.8
|
489
|
34.9
|
20
|
|
14″
|
603.3
|
69.9
|
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