Dimensions Weld Neck & Slip-On flanges BS 3293 Class 400



Weld Neck flange

OTHER PRESSURE CLASSES

150
300
400
600

Foreword

NPS O B1 C Y2/Y1 A X1
26 971.5 666.7 88.9 193.7 668.3 693.7
28 1035.0 717.6 95.2 206.4 719.1 746.1
30 1092.2 768.3 101.6 219.1 769.6 800.1
32 1149.3 819.1 107.9 231.8 822.3 852.5
34 1206.5 869.9 111.1 241.3 873.1 904.9
36 1270.0 920.7 114.3 250.8 925.5 958.8


Slip-On flange

NPS X R NBH DBH D r
26 727.1 749.3 28 47.6 876.3 11.11
28 782.6 800.1 28 50.8 939.8 12.7
30 836.6 857.2 28 54.0 996.9 12.7
32 889.0 914.4 28 54.0 1054.1 12.7
34 944.6 965.2 28 54.0 1104.9 14.29
36 1012.9 1022.3 32 54.0 1168.4 14.29

Indications..


Weights of Class 400 Weld Neck & Slip-On flanges

NPS Weld Neck
kg
Slip-On
kg
26 340 295
28 399 354
30 454 408
32 522 465
34 590 522
36 669 601

Note..



Ring Joint Facings BS 3293



Ring Joint Facings BS 3293

NPS Ring
No.
Raised Face
O.D.
Groove Weights in Kg
Weld Neck
Slip-On
R K L M Cl
300
Cl
400
Cl
600
26 R93 809.6 749.3 12.7 19.8 298
270
349
304
446
417
28 R94 860.4 800.1 12.7 19.8 360
333
409
364
518
482
30 R95 917.6 857.2 12.7 19.8 412
376
465
419
570
537
32 R96 984.2 914.4 14.3 23.0 465
425
539
482
697
622
34 R97 1035.0 965.2 14.3 23.0 536
492
608
540
735
670
36 R98 1092.2 1022.3 14.3 23.0 595
548
689
621
800
764

Indications..


Dimensions and Tolerances BS 3293

TYPE OF FLANGES INDICATIONS TOL
Weld Neck and Slip-On flanges Raised face diameter ±0.40
Flange thickness +4.76
-0
Overall length ±3.18
Outside diameter at welding end of weld neck hub +3.97
-0.79
Inside diameter of weld neck flange +3.18
-1.59
Inside diameter of slip on flange +1.59
-0
Ring Joint Facing on Weld Neck and Slip-On flanges Depth of groove +0.40
-0
Width of groove ±0.20
Pitch diameter of groove ±0.13

General note..