COMPOSITE WELD NECK FLANGES

Weld Neck Stub Ends and Backing Flanges

Type and Construction

The weld neck stub ends are in accordance with EEMUA 234, Section 1A for 16 and 20 bar systems. The range of sizes covered is ½ in./16 mm to 36 in./914 mm. Other sizes are available on request. The stub ends are subdivided in two types short (Type S)  based on DIN 86037 and long (Type L) based on MSS SP-43 suit the appropriate pipe dimension. The Type L stub ends are included to facilitate the attachments of this type of flange to butt weld welding fittings in accordance with EEMUA-234.

Dimensions

Dimensions are based on EEMUA-234, Section 1A, Tables 1.2-1.3.

Tolerances

The tolerances are based on EEMUA–234, Section 1A, Table 1.5.1.

Weld Preparation

The stub ends with S1<3mm are supplied with plain weld ends. Larger dimension are supplied with the weld bevel of 37 ½°±2 ½°.


Nominal
Size
in



mm



d3
mm


d4
mm


d6
mm
16 bar

d7
mm
20 bar
Type S
d7
mm

Type L
H1
mm


H
mm


h2
mm


h5
mm
16 bar
S
min.
mm
20 barS
min.
mm
½ 16 16 40 18  Use
20 bar
12.00 35 51 4 15 Use
20 bar
2.00
¾ 25 25 50 27 21.00 40 51 5 15 2.00
1 30 30 60 32 25.00 40 51 5 15 2.50
38 38 70 40 33.03 40 51 5 15 2.50
44.5 44.5 80 46.5 39.53 45 51 6 15 2.50
2 57 57 99 59 52.16 45 64 6 15 2.50
76.1 76.1 120 78 71.23 45 64 6 15 2.50
3 88.9 88.9 130 91 84.08 50 64 7 15 2.50
4 108 108 158 110 102.13 50 76 7 15 3.00
6 159 159 212 161.5 153.75 152.38 50 89 9 15 3.00 3.50
8 219.1 219.1 270 222 211.10 210.10 50 102 9 15 4.00 4.50
10 267 267 320 270 257.97 255.93 50 127 9 15 4.50 5.50
12 323.9 323.9 370 327 312.83 309.74 50 152 11 16 5.50 7.00
14 368 368 430 371 354.22 351.00 50 152 11 16 6.50 8.00
16 419 419 482 422 404.17 399.84 50 152 12 16 7.00 9.00
18 457.2 457.2 530 460 441.50 438.50 50 152 12 16 8.00 9.50
20 508 508 585 511 490.50 486.50 50 152 12 20 8.50 11.00
24 610 610 685 613 589.50 584.50 60 152 14 20 10.50 13.00
28 711 711 800 719 687.50 681.50 60 190 19 24 12.00 15.00
32 813 813 905 821 786.50 779.50 60 190 20.5 24 13.50 17.00
36 914 914 1000 922 883.50 876.50 60 190 22 32 15.50 19.00

Type and Construction

The weld neck backing flanges are in accordance with EEMUA 234, Section 1B and are suitable for both 16 and 20 bar pressure rating. 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 backing flanges are manufactured from forged carbon steel in accordance with ASTM A105. The chemical composition and mechanical properties of the components are in accordance with EEMUA 234, Section 1B, Table 1.6.2. The recommended bolting is in accordance with ASTM A193-B7. Unless otherwise specified the flanges are protected by hot dipped galvanising. Additional organic coatings such as polyamide epoxy are available on request.

Dimensions

Dimensions are based on EEMUA - 234, Section 1B, Table 1.4.

Tolerances

The tolerances are based on EEMUA – 234, Section 1B, Table 1.5.2.

Nominal     b                 Approx. Total Weight
Size   D min. d2   d5 K No. Of e     incl. Stub End - kg
in mm mm mm in mm mm mm Bolts mm S 16 bar L S 20 bar L
½ 16 89 14 5/8 15.9 19 60.3 4 2  as for 20 bar 0.64 0.66
¾ 25 98 14 5/8 15.9 28 69.8 4 3 0.8 0.9
1 30 108 14 5/8 15.9 33 79.4 4 3 1 1
38 117 14 5/8 15.9 41 88.9 4 3 1.2 1.3
44.5 127 14 5/8 15.9 48 98.4 4 3 1.5 1.6
2 57 152 18 3/4 19 62 120.6 4 3 2.5 2.6
76.1 178 18 3/4 19 81 139.7 4 3 3.3 3.4
3 88.9 190 19 3/4 19 94 152.4 4 3 3.8 3.9
4 108 229 24 3/4 19 113 190.5 8 3 6.6 6.9
6 159 279 27 7/8 22.2 164 241.3 8 4 9.7 10.4 9.9 10.7
8 219.1 343 31 7/8 22.2 225 298.4 8 5 15 16.7 15.1 17
10 267 406 38 1 25.4 273 362 12 5 23.1 26.6 23.5 27.5
12 323.9 483 41 1 25.4 330 431.8 12 7 34.6 41 35.2 43.1
14 368 533 45 1 1/8 28.6 374 476.2 12 7 44.7 53.4 45.5 55.8
16 419 597 51 1 1/8 28.6 426 539.8 16 7 60 70.5 60.6 72.5
18 457.2 635 52 1 1/4 31.8 465 577.8 16 7 66 78 68 84.3
20 508 698 58 1 1/4 31.8 517 635 20 7 84.4 98.7 86 103.5
24 610 813 71 1 3/8 34.9 618 749.3 20 9 131.4 149.8 134 156.5
28 711 927 81 1 3/8 34.9 727 864 28 9 180.3 202.9 183.6 212.1
32 813 1060 95 1 5/8 41.1 829 978 28 9 269 296.8 275.5 311.2
36 914 1168 105 1 5/8 41.1 931 1086 32 9 335.8 369.8 341 385.8

Slip-On Stub Ends and Slip-On Backing Flanges

Type and Construction

The slip-on stub ends are in accordance with EEMUA 234, Section 2A and are suitable for 16 and 20 pressure rating. The range of sizes covered is ½ in./16 mm to 4 in./108 mm Class 150. The slip-on backing flanges are in accordance with EEMUA 234, Section 2B. Drilling and outside diameter dimensions are in accordance with ANSI B16.5 and BS 1560. The backing flanges are suitable for use in both 16 and 20 bar systems. The backing flanges are manufactured from forged carbon steel in accordance with ASTM A105. The chemical composition and mechanical properties of the components are in accordance with EEMUA 234, Section 2B, Table 2.5.2. The recommended bolting is in accordance with ASTM A193-B7. Unless otherwise specified the flanges are protected by hot dipped galvanising. Additional organic coatings such as polyamide epoxy are available on request.

Dimensions

Dimensions are based on EEMUA - 234, Section 2A and 2B, Tables 2.2 and 2.3.

Tolerances

The tolerances are based on EEMUA – 234, Section 2A and 2B, Tables 2.4.1 and 2.4.2.

Nominal   Inner Stub End Dimension     Outer Steel Flange - Dimension       No. Of Bolt Approx.
Size   d1 d3 d4 H h D b K d5 d2 e Holes Total Weight
in mm mm mm mm mm mm mm mm mm mm in mm mm (kg)  
½ 16 16.07 21 40 16 5 89 14 60.3 23 5/8 15.9 3 4 0.61
¾ 25 25.08 31 53 16 5 98 14 69.8 33 5/8 15.9 3 4 0.75
1 30 30.08 36 60 18 5 108 14 79.4 38 5/8 15.9 3 4 0.92
38 38.10 45 70 18 5 117 14 88.9 47 5/8 15.9 3 4 1.10
44.5 44.60 51 80 19 5 127 14 98.4 53 5/8 15.9 3 4 1.30
2 57 57.23 67 99 19 6 152 18 120.6 69 3/4 19 3 4 2.20
76.1 76.33 87 120 19 6 178 18 139.7 89 3/4 19 3 4 3.00
3 88.9 89.18 100 130 21 7 190 19 152.4 103 3/4 19 3 4 3.50
4 108 108.38 120 158 23 7 229 24 190.5 123 3/4 19 3 4 6.00