Butt-Welding Neck Flange

WELDING NECK FLANGE is distinguished from other types by their long tapered hub and gentle transition of thickness in the region of the butt weld joining them to the pipe. The long tapered hub provides an important reinforcement of the flange proper from the standpoint of strength and resistance to dishing. The smooth transition from flange thickness to pipe wall thickness effected by the taper is extremely beneficial under conditions of repeated bending, caused by line expansion or other variable forces and produces an endurance strength of welding neck flanged assemblies equivalent to that of a butt welded joint between pipes, which, in practice, is the same as that of unwelded pipe. Thus this type of flange is preferred for every severe service condition, whether this results from high pressure or from sub-zero or elevated temperature, and whether loading conditions are substantially constant or fluctuate between wide limits.
 
 
Specification:
Manufacturing standards: ANSI B 16.5, BS 1560. BS 10, IS 6392, B-2.1 NPT, API, DIN, JIS. MSS SP 44
Stainless Steel: ASTM A182 F304/ 304L/ 304H/ 316/ 316L/ 317/ 317L/ 321/ 310/ 347/ 904Letc.

Duplex Stainless Steel: UNS S31803, 2205 
Carbon Steel: ASTM A105/ A694 F42/ 46/52/56/60/65/70/A350 LF3/A350 LF2, etc.
Alloy Steel: ASTM A 182, GR F1, F11, F22, F5, F9, F91 
Size: 1/8" NB to 48"NB 
Class: 150, 300, 400, 600, 900, 1500 & 2500
The surface forms: according to customer requirements

 

密封面型式

公称压力PN/MPa bar

0.25
2.5

0.6
6

1.0
10

1.6
16

2.5
25

4.0
40

6.3
63

10.0
100

16.0
160

25.0
250

突面(RF)

DN10-300

DN10-2000

DN10-1000

DN10-600

DN10-400

DN10-300

DN10-250

凹凸面(MFM)

-

DN10-600

DN10-400

DN10-300

-

榫槽面(TG)

-

DN10-600

DN10-400

DN10-300

-

平面(FF)

DN10-3000

DN10-2000

-

环连接面(RJ)

-

DN15-400

DN15-300

DN15-250

 

密封面型式 公称压力PN/MPa (Class)
2.0
(150LB)
5.0
(300LB)
11.0
(600LB)
15.0
(900LB)
26.0
(1500LB)
42.0
(2500LB)  
突面(RF) DN15-600
(1/2"-24")
DN15-300
(1/2"-12")
凹凸面(MFM) - DN15-600
(1/2"-24")
DN15-65
(1/2"-2.1/2")
DN15-300
(1/2"-12")
榫槽面(TG) - DN15-600
(1/2"-24")
DN15-65
(1/2"-2.1/2")
DN15-300
(1/2"-12")
平面(FF) DN15-600
(1/2"-24")
-
环连接面(RJ) DN25-600
(1/2"-24")
DN15-600
(1/2"-24")
DN15-300
(1/2"-12")