ASME/ANSI B16.5 Class 1500 WN

The Welding neck flanges is normally referred to as the high hub flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange. The welding neck flange is the best designed butt-welded flange of those currently available because of its inherent structural value. It is expensive because of the design.

Nominal Pipe Size Outside Diameter of FlangeDiameter of Raised FaceThickness of Flanges Min.Diameter of HubHub Diameter Beginning of ChamferLength Through HubBoreDiameter of Bolt CircleDiameter of Bolt HolesNumber of BoltsApproxi-mate Weight kgs
NPSORtfXAYBWIn　
1/212034.922.33821.36015.882.622.241.86
3/413042.925.44426.77021.088.922.242.55
115050.828.65233.47326.6101.625.443.78
1 1/416063.528.66442.27335.1111.125.444.40
1 1/218073.031.87048.38340.9123.828.646.12
221592.138.110560.310252.5165.125.4810.86
2 1/2245104.841.312473.010562.7190.528.6815.20
3265127.047.713388.911777.9203.231.8819.61
4310157.254.0162114.3124102.3241.334.9829.63
5375185.773.1197141.3156128.2292.141.3856.87
6395215.982.6229168.3171154.1317.538.11268.10
8485269.992.1292219.1213202.7393.744.512116.26
10585323.8108.0368273.0254254.5482.650.812200.20
12675381.0123.9451323.8283304.7571.554.016300.10
14750412.8133.4495355.6298336.5635.060.316392.98
16825469.9146.1552406.4311387.3704.866.716498.22
18915533.4162.0597457.0327437.9774.773.016651.35
20985584.2177.8641508.0356488.9831.879.416795.97
241170692.2203.2762610.0406590.9990.692.1161265.87

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