BS 3293 Class 300 SO

Pipe flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification.

The Slip-on flange has a low hub because the pipe slips into the flange prior to welding. It is welded both inside and out to provide sufficient strength and prevent leakage.Slip-on flanges are all bored slightly larger than the O.D. of the pipe.

Nominal
pipe size
Outside
diameter of
flange, O
Outside
diameter,
R
Thickness of
flange min., C
 Outside
diameter of
large end of hub, X
Outside diameter
of small end of
hub, A
Length through hub, YFillet radiusFlange bore, BDiameter of
bolt circle, D
Diameter of
bolt holes
Number of
bolt holes
Approxi-mate Weight kgs
26971.55749.3079.381.60720.73687.39184.156.35666.75876.3044.4528247.29
281035.05800.1085.731.60774.70739.78196.856.35717.55939.8044.4528301.48
301092.20857.2592.081.60825.50792.16209.556.35768.35996.9547.6328348.61
321149.35914.4098.431.60881.06844.55222.257.94819.151054.1050.8028402.88
341206.50965.20101.601.60936.63896.94231.787.94869.951104.9050.8028455.53
361270.001022.35104.781.60990.60949.33241.307.94920.751168.4053.9832508.05
Note: 7 mm raised face regularly furnished on Classes 150 and 300 unless otherwise ordered.

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