Type and Construction
The solid weld neck flanges are in accordance with EEMUA 234, Section 3 for 16 and 20 bar systems. The range of sizes covered is ½ in./ 16 mm to 36 in./914 mm Class 150. Other sizes are available on request. Drilling and outside diameter dimensions of flange sizes ½ in./16 mm-24 in./610 mm are in accordance with ANSI B16.5 and BS 1560, whereas the larger sizes, 28 in./711 mm -36 in./914 mm are in accordance with MSS SP-44. The recommended bolting is in accordance with ASTM B150 alloy UNS C63000.

Dimensions
Dimensions are based on EEMUA -234, Section 3, Table 3.2-3.3.

Tolerances
The tolerances are based on EEMUA – 234, Section 3, Table 3.4.

 

 

 

 

 

 

 

16 bar

20 bar

16 bar

20 bar

16 bar

20 bar

 

 

 

 

Nominal Size 

O.D. of Flange

Thickn. of Flange

Dia of Hub

Hub dia at weld Chamfer

Length Through Hub

Bore of Flange

Thickn. of Hub at Welding End

Approx. Weight

Parallel Length of Hub

Dia of Bolt Circle

Drilling

Dia of Bolt Holes

 

 

D

b

d6

d3

H

d7

d7

S1 min

S1 min

 

 

h

K

No. Of Bolts

d2

in

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

kg

kg

mm

mm

 

mm

½

16

89

14

23

16

48

u
s
e

2
0

b
a
r

12.00

u
s
e

2
0

b
a
r

2.0

u
s
e

2
0

b
a
r

0.7

8

60.3

4

15.9

¾

25

98

16

32

25

52

21.00

2.0

1.0

7

69.8

4

15.9

1

30

108

16

42

30

56

25.00

2.5

1.3

8

79.4

4

15.9

38

117

17

51

38

57

33.03

2.5

1.7

8

88.9

4

15.9

44.5

127

20

61

44.5

62

39.53

2.5

2.3

7

98.4

4

15.9

2

57

152

25

73

57

64

52.16

2.5

4.1

9

120.6

4

19.0

76.1

178

27

91

76.1

70

71.23

2.5

6.1

8

139.7

4

19.0

3

88.9

190

27

105

88.9

70

84.08

2.5

7.1

8

152.4

4

19.0

4

108

229

27

135

108

76

102.13

3.0

10.2

8

190.5

8

19.0

6

159

279

27

192

159

89

153.75

152.38

3.0

3.5

15.5

15.8

8

241.3

8

22.2

8

219.1

343

31

246

219.1

98

211.10

210.10

4.0

4.5

27.7

28.0

8

298.4

8

22.2

10

267

406

31

305

267

98

257.97

255.93

4.5

5.5

38.5

39.3

8

362.0

12

25.4

12

323.9

483

35

365

323.9

98

312.83

309.74

5.5

7.0

61.6

62.9

8

431.8

12

25.4

14

368

533

41

400

368

99

354.22

351.00

6.5

8.0

86.8

88.4

8

476.2

12

28.6

16

419

597

43

457

419

106

404.17

399.84

7.0

9.0

114.2

115.6

8

539.8

16

28.6

18

457.2

635

45

505

457.2

113

441.50

438.50

8.0

9.5

136.0

140.7

8

577.8

16

31.8

20

508

698

45

559

508

118

490.50

486.50

8.5

11.0

164.6

168.4

8

635.0

20

31.8

24

610

813

49

664

610

137

589.50

584.50

10.5

13.0

247.7

253.7

8

749.3

20

34.9

28

711

927

72

748

711

145

687.50

681.40

12.0

15.0

453.0

461.1

8

864.0

28

34.9

32

813

1060

72

876

813

160

786.50

779.50

13.5

17.0

599.0

611.1

8

978.0

28

41.1

36

914

1168

72

984

914

175

883.50

876.50

15.5

19.0

741.0

755.7

8

1086.0

32

41.1

It should be noted that although these flanges are flat faced, inside bolt circle gaskets shall be used and special care should be taken to avoid overtightening the bolting.