ANSI B16.5 Welding Neck Flange is a high-integrity pipe flange designed for high-pressure, high-temperature, and critical service applications. Manufactured in strict accordance with the ANSI/ASME B16.5 standard, this flange features a long tapered hub that provides smooth stress distribution between the flange and the pipe, significantly improving structural strength and fatigue resistance. Welding neck flanges are widely selected for demanding piping systems where leak prevention, mechanical stability, and long-term operational safety are essential. They are commonly used in oil & gas, chemical processing, power generation, and industrial process pipelines requiring reliable performance under severe operating conditions.
Specification of Titanium Weld Neck Flanges
| Material Grade | Gr2, (Gr7, GR12) |
| Certification | ISO9001:2008, EN10204.3.1 |
| Standard | ANSI B16.5, ASTM B16.5, ASME B16.47, |
| size | 1/2"~ 60"NB, NPS 1/2 - NPS 24 (DN 10 - 2000) |
| Pressure Class | 150LB, 300LB, 600 LB,900LB, 1500LB, 2500LB |
| Technique | Forged and CNC Machined |
| type | WN |
| Flange surface | FF,RF,TG,RJ ,MFM, etc |
| Application | It is usually used in construction,petroleum, chemical industry, power, ship building, paper making, metallurgy, water supply and sewage work, light and heavy industry, plumbing and electric etc. |
Flange Dimensions & Approximate Masses
|
ANSI, ASME, ASA, B16.5 150lb/sq.in. WELDING NECK FLANGE RF
|
|||||||||||
|
ø |
D |
b |
g |
m |
a |
J* |
h |
k |
Holes |
l |
Kg. |
|
1/2" |
88,9 |
11,1 |
34,9 |
30,2 |
21,3 |
15,7 |
47,6 |
60,3 |
4 |
15,9 |
0,500 |
|
3/4" |
98,4 |
12,7 |
42,9 |
38,1 |
26,7 |
20,8 |
52,4 |
69,8 |
4 |
15,9 |
0,700 |
|
1" |
107,9 |
14,3 |
50,8 |
49,2 |
33,5 |
26,7 |
55,6 |
79,4 |
4 |
15,9 |
1,100 |
|
1 1/4" |
117,5 |
15,9 |
63,5 |
58,8 |
42,2 |
35,1 |
57,1 |
88,9 |
4 |
15,9 |
1,500 |
|
1 1/2" |
127,0 |
17,5 |
73,0 |
65,1 |
48,3 |
40,9 |
61,9 |
98,4 |
4 |
15,9 |
1,800 |
|
2" |
152,4 |
19,0 |
92,1 |
77,8 |
60,3 |
52,6 |
63,5 |
120,6 |
4 |
19,0 |
2,700 |
|
2 1/2" |
177,8 |
22,2 |
104,8 |
90,5 |
73,1 |
62,7 |
69,8 |
139,7 |
4 |
19,0 |
4,400 |
|
3" |
190,5 |
23,8 |
127,0 |
107,9 |
88,9 |
78,0 |
69,8 |
152,4 |
4 |
19,0 |
5,200 |
|
3 1/2" |
215,9 |
23,8 |
139,7 |
122,2 |
101,6 |
90,2 |
71,4 |
177,8 |
8 |
19,0 |
6,400 |
|
4" |
228,6 |
23,8 |
157,2 |
134,9 |
114,3 |
102,4 |
76,2 |
190,5 |
8 |
19,0 |
7,500 |
|
5" |
254,0 |
23,8 |
185,7 |
163,5 |
141,2 |
128,3 |
88,9 |
215,9 |
8 |
22,2 |
9,200 |
|
6" |
279,4 |
25,4 |
215,9 |
192,1 |
168,4 |
154,2 |
88,9 |
241,3 |
8 |
22,2 |
11,000 |
|
8" |
342,9 |
28,6 |
269,9 |
246,1 |
219,1 |
202,7 |
101,6 |
298,4 |
8 |
22,2 |
18,300 |
|
10" |
406,4 |
30,2 |
323,8 |
304,8 |
273,0 |
254,5 |
101,6 |
361,9 |
12 |
25,4 |
25,000 |
|
12" |
482,6 |
31,7 |
381,0 |
365,1 |
323,8 |
304,8 |
114,3 |
431,8 |
12 |
25,4 |
39,000 |
|
14" |
533,4 |
34,9 |
412,7 |
400,0 |
355,6 |
336,5 |
127,0 |
476,2 |
12 |
28,6 |
51,000 |
|
16" |
596,9 |
36,5 |
469,9 |
457,2 |
406,4 |
387,3 |
127,0 |
539,7 |
16 |
28,6 |
60,000 |
|
18" |
635,0 |
39,7 |
533,4 |
504,8 |
457,2 |
438,1 |
139,7 |
577,8 |
16 |
31,7 |
71,000 |
|
20" |
698,5 |
42,9 |
584,2 |
558,8 |
508,0 |
488,9 |
144,5 |
635,0 |
20 |
31,7 |
88,000 |
|
22" |
749,3 |
46,0 |
641,2 |
609,6 |
558,8 |
539,7 |
149,2 |
692,1 |
20 |
34,9 |
102,000 |
|
24" |
812,8 |
47,6 |
692,1 |
663,6 |
609,6 |
590,5 |
152,4 |
749,3 |
20 |
34,9 |
119,000 |
|
* |
The data "J" corresponds to the STD schedule |
||||||||||
NOTE:
1. Class 150 flanges except Lap Joint will be furnished with 0.06 (1.6mm) raised face, which is included in 'Thickness' (C) and 'Length through Hub' (Y1), (Y3).
2. For Slip-on, Threaded, Socket Welding and Lap Joint Flanges, the hubs can be shaped either vertical from base to top or tapered within the limits of 7 degrees.
3. Blind Flanges may be made with the same hub as that used for Slip-on Flanges or without hub.
4. The gasket surface and backside (bearing surface for bolting) are made parallel within 1 degree. To accomplish parallelism, spot facing is carried out according to MSS SP-9, without reducing thickness (C).
5. Depth of Socket (D) is covered by ANSI B 16.5 only in sizes through 3 inch, over 3 inch is at the manufacturer's option.
6. Welding Neck Flange Bore Size SCH10, SCH20, SCH30, STD, SCH40, SCH60, SCH80, SCH100, SCH 120, SCH140, SCH160, XS
|
ANSI, ASME, ASA B16.5 300lb/sq.in. WELDING NECK FLANGE RF |
|||||||||||
|
ø |
D |
b |
g |
m |
a |
J* |
h |
k |
Holes |
l |
Kg. |
|
1/2" |
95,2 |
14,3 |
34,9 |
38,1 |
21,3 |
15,7 |
52,4 |
66,7 |
4 |
15,9 |
0,900 |
|
3/4" |
117,5 |
15,9 |
42,9 |
47,6 |
26,7 |
20,8 |
57,1 |
82,5 |
4 |
19,0 |
1,500 |
|
1" |
123,8 |
17,5 |
50,8 |
54,0 |
33,5 |
26,7 |
61,9 |
88,9 |
4 |
19,0 |
1,900 |
|
1 1/4" |
133,3 |
19,0 |
63,5 |
63,5 |
42,2 |
35,1 |
65,1 |
98,4 |
4 |
19,0 |
2,600 |
|
1 1/2" |
155,6 |
20,6 |
73,0 |
69,8 |
48,3 |
40,9 |
68,3 |
114,3 |
4 |
22,2 |
3,300 |
|
2" |
165,1 |
22,2 |
92,1 |
84,1 |
60,3 |
52,6 |
69,8 |
127,0 |
8 |
19,0 |
3,600 |
|
2 1/2" |
190,5 |
25,4 |
104,8 |
100,0 |
73,1 |
62,7 |
76,2 |
149,2 |
8 |
22,2 |
5,400 |
|
3" |
209,5 |
28,6 |
127,0 |
117,5 |
88,9 |
78,0 |
79,4 |
168,3 |
8 |
22,2 |
7,400 |
|
3 1/2" |
228,6 |
30,2 |
139,7 |
133,3 |
101,6 |
90,2 |
81,0 |
184,1 |
8 |
22,2 |
8,900 |
|
4" |
254,0 |
31,7 |
157,2 |
146,0 |
114,3 |
102,4 |
85,7 |
200,0 |
8 |
22,2 |
11,900 |
|
5" |
279,4 |
34,9 |
185,7 |
177,8 |
141,2 |
128,3 |
98,4 |
234,9 |
8 |
22,2 |
16,000 |
|
6" |
317,5 |
36,5 |
215,9 |
206,4 |
168,4 |
154,2 |
98,4 |
269,9 |
12 |
22,2 |
20,200 |
|
8" |
381,0 |
41,3 |
269,9 |
260,3 |
219,1 |
202,7 |
111,1 |
330,2 |
12 |
25,4 |
31,000 |
|
10" |
444,5 |
47,6 |
323,4 |
320,7 |
273,0 |
254,5 |
117,5 |
387,3 |
16 |
28,6 |
44,300 |
|
12" |
520,7 |
50,8 |
381,0 |
374,6 |
323,8 |
304,8 |
130,2 |
450,8 |
16 |
31,7 |
64,000 |
|
14" |
584,2 |
54,0 |
412,7 |
425,4 |
355,6 |
336,5 |
142,9 |
514,3 |
20 |
31,7 |
88,000 |
|
16" |
647,7 |
57,1 |
469,9 |
482,6 |
406,4 |
387,3 |
146,0 |
571,5 |
20 |
34,9 |
113,000 |
|
18" |
711,2 |
60,3 |
533,4 |
533,4 |
457,2 |
438,1 |
158,7 |
628,6 |
24 |
34,9 |
134,000 |
|
20" |
774,7 |
63,5 |
584,2 |
587,4 |
508,0 |
488,9 |
161,9 |
685,8 |
24 |
34,9 |
171,000 |
|
22" |
838,2 |
66,7 |
641,2 |
641,2 |
558,8 |
539,7 |
165,1 |
742,9 |
24 |
41,3 |
195,000 |
|
24" |
914,4 |
69,8 |
692,1 |
701,7 |
609,6 |
590,5 |
168,3 |
812,8 |
24 |
41,3 |
238,000 |
|
* |
The data "J" corresponds to the STD schedule |
|
ANSI/ASME/ASA B16.5 600lb/sq.in. WELDING NECK FLANGE RF |
|||||||||||
|
ø |
D |
b |
g |
m |
a |
J* |
h |
k |
Holes |
l |
Kg. |
|
1/2" |
95,2 |
14,3 |
34,9 |
38,1 |
21,3 |
15,7 |
52,4 |
66,7 |
4 |
15,9 |
0,900 |
|
3/4" |
117,5 |
15,9 |
42,9 |
47,6 |
26,7 |
20,9 |
57,1 |
82,5 |
4 |
19,0 |
1,500 |
|
1" |
123,8 |
17,5 |
50,8 |
54,0 |
33,5 |
26,7 |
61,9 |
88,9 |
4 |
19,0 |
1,900 |
|
1 1/4" |
133,3 |
20,6 |
63,5 |
63,5 |
42,2 |
35,0 |
66,7 |
98,4 |
4 |
19,0 |
2,600 |
|
1 1/2" |
155,6 |
22,2 |
73,0 |
69,8 |
48,3 |
40,9 |
69,8 |
114,3 |
4 |
22,2 |
3,300 |
|
2" |
165,1 |
25,4 |
92,1 |
84,1 |
60,3 |
52,6 |
73,0 |
127,0 |
8 |
19,0 |
4,700 |
|
2 1/2" |
190,5 |
28,6 |
104,8 |
100,0 |
73,1 |
62,7 |
79,4 |
149,2 |
8 |
22,2 |
6,500 |
|
3" |
209,5 |
31,7 |
127,0 |
117,5 |
88,9 |
78,0 |
82,5 |
168,3 |
8 |
22,2 |
8,700 |
|
3 1/2" |
228,6 |
34,9 |
139,7 |
133,3 |
101,6 |
90,1 |
85,7 |
184,1 |
8 |
25,4 |
11,200 |
|
4" |
273,0 |
38,1 |
157,2 |
152,4 |
114,3 |
102,4 |
101,6 |
215,9 |
8 |
25,4 |
18,100 |
|
5" |
330,2 |
44,4 |
185,7 |
188,9 |
141,2 |
128,2 |
114,3 |
266,7 |
8 |
28,6 |
30,500 |
|
6" |
355,6 |
47,6 |
215,9 |
222,2 |
168,4 |
154,2 |
117,5 |
292,1 |
12 |
28,6 |
36,200 |
|
8" |
419,1 |
55,6 |
269,9 |
273,0 |
219,1 |
202,7 |
133,3 |
349,2 |
12 |
31,7 |
56,500 |
|
10" |
508,0 |
63,5 |
323,8 |
342,9 |
273,0 |
254,5 |
152,4 |
431,8 |
16 |
34,9 |
91,000 |
|
12" |
558,8 |
66,7 |
381,0 |
400,0 |
323,8 |
304,8 |
155,6 |
488,9 |
20 |
34,9 |
105,000 |
|
14" |
603,2 |
69,8 |
412,7 |
431,8 |
355,6 |
* |
165,1 |
527,0 |
20 |
38,1 |
125,000 |
|
16" |
685,8 |
76,2 |
469,9 |
495,3 |
406,4 |
177,8 |
603,2 |
20 |
41,3 |
178,000 |
|
|
18" |
742,9 |
82,5 |
533,4 |
546,1 |
457,2 |
184,1 |
654,0 |
20 |
44,4 |
261,000 |
|
|
20" |
812,8 |
88,9 |
584,2 |
609,6 |
508,0 |
190,5 |
723,9 |
24 |
44,4 |
268,000 |
|
|
22" |
869,9 |
95,2 |
641,2 |
666,7 |
558,8 |
196,8 |
777,9 |
24 |
47,6 |
328,000 |
|
|
24" |
939,8 |
101,6 |
692,1 |
717,5 |
609,6 |
203,2 |
838,2 |
24 |
50,8 |
380,000 |
|
|
* |
The data "J" corresponds to the STD schedule |
||||||||||
|
To be specifiedby customer |
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