• Welding neck flange
  • Welding neck flange

Welding neck flange

The size of welding neck flange:  1/2inch(DN15) - 48 inch (DN1200)

The pressure of welding neck flange:  150LB(PN16)-2500LB(PN420)

The material of welding neck flange:  A105,LF2,F304,F304L,F316,F316L,F321,F347H,F51,MONEL

The welding neck flange is usually installed in the middle of the piping,this type of the flange mainly used in high pressure and high temperature environment,this type of the flange has more type of the sealing face,it has RF,FM,FF and RTJ.the type of the flange only has forging.

Details of Welding Neck flange



Welding Neck flange



Welding Neck flange

Welding Neck Flanges are easy to recognize at the long tapered hub, that goes gradually over to the wall thickness from a pipe or fitting.

The long tapered hub provides an important reinforcement for use in several applications involving high pressure, sub-zero and / or elevated temperatures. The smooth transition from flange thickness to pipe or fitting wall thickness effected by the taper is extremely beneficial, under conditions of repeated bending, caused by line expansion or other variable forces.

These flanges are bored to match the inside diameter of the mating pipe or fitting so there will be no restriction of product flow. This prevents turbulence at the joint and reduces erosion. They also provide excellent stress distribution through the tapered hub and are easily radiographed for flaw detection.

This flange type will be welded to a pipe or fitting with a single full penetration, V weld (Buttweld).


drawing for WN FLANGE

Main Connection Dimensions:

Pressure

DN

A

D

K

L

n

Bolt

C

B

N

H

150LB

15

21.3

90

60.5

16

4

M14

11.5

15.5

30

48

20

26.9

100

70

16

4

M14

13

21

38

52

25

33.7

110

79.5

16

4

M14

14.5

27

49

56

32

42.4

120

89

16

4

M14

16

35

59

57

40

48.3

130

98.5

16

4

M14

17.5

41

65

62

50

60.3

150

120.5

18

4

M16

19.5

52

78

64

65

76.1

180

139.5

18

4

M16

22.5

66

90

70

80

88.9

190

152.5

18

4

M16

24

77.5

108

70

100

114.3

230

190.5

18

8

M16

24

101.5

135

76

125

139.7

255

216

22

8

M20

24

127

164

89

150

168.3

280

241.5

22

8

M20

25.5

154

192

89

200

219.1

345

298.5

22

8

M20

29

203

246

102

250

273

405

362

26

12

M24

30.5

255

305

102

300

323.9

485

432

26

12

M24

32

303.5

365

114

350

355.6

535

476

29.5

12

M27

35


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