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BS 3293 Standard Welding Neck,Slip On Flange (150lb-600lb)
Source: | Auditor:Paisen PFF | Published time: 2020-10-28 | 4622 Views | Share:

British Standard BS 3293:1960-Carbon Steel Pipe Flanges (over 24 inches nominal size) for the Petroleum Industry,covers Class 150 lb to 600 lb weld neck and slip on flanges.

Dimensions and Tolerances. Tolerances on flange dimensions (BS 3293 : 1960)

　                                        Dimension                                                                                 Tolerance
in                      mm                 
Weld Neck and Slip On Flanges (pages 8-56 to8-59) G (raised face diameter)     ±1/64 ±0.40
C (flange thickness) +3/16, -0 +4.76, -0
D (overall length) ±1/8 ±3.18
E (outside diameter at welding end of weld neck hub) +5/32, 1/32 +3.97, -0.79
B (inside diameter of weld neck flange) +1/8, 1/16 +3.18, -1.59
B (inside diameter of slip on flange) +1/16, -0 +1.59, -0
Ring Joint Facingon Weld Neck and Slip On Flanges (see below) L (depth of groove) +1/64, -0 +0.40, -0
M (width of groove) ±0.008 ±0.20
K (pitch diameter of groove) ±0.005 ±0.13