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ASTM A335 Chrome Moly Pipe



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Flange Tolerance

Tolerance of Welding Neck Flanges
Outside Diameter When O.D. is 24" or less  ±1.6mm﹡
Inside Diameter 10" and smaller  ±0.8mm
12" thru 18"  ±1.6mm
20" and larger  +3.2mm, -1.6mm
Outside Diameter of hub 5" and smaller  +2.4mm, -0.8mm﹡
6" and larger  +4.0mm, -0.8mm
Diameter of contact face 1/16" rasied face tongue and groove male, female  ±0.8mm
1/4" rasied face tongue and groove male, female  ±0.4mm
Diameter of hub at base when hub base is 24" or smaller  ±1.6mm﹡
Diameter of hub at point of welding 5" and smaller  +2.4mm, -0.8mm
6" and larger  +4.0mm, -0.8mm
Drilling Bolt circle  ±1.6mm
Bolt hole spacing  ±0.8mm
Eccentricity of bolt circle with respect to facing 2 1/2" and smaller: 0.8mm, max﹡
Eccentricity of bolt circle with respect to bore 3" and larger: 1.6mm, max﹡
Thickness 18" and smaller  +3.2mm, -0mm
20" and larger  +4.8mm, -0mm
Length of thru hub 10" and smaller  ±1.6mm
12" and larger  ±3.2mm

 

Tolerance of Threaded Flanges, Socket Welding Flanges, Slip-On Flanges
Lap Joint Flanges and Blind Flanges
Outside Diameter When O.D. is 24" or less  ±1.6mm﹡
Inside Diameter Threaded Within limits on boring gauge
Socket welding, Slip-on and Lap joint, 10" and smaller  +0.8mm, -0mm
Socket welding, Slip-on and Lap joint, 12" and larger  +1.6mm, -0mm
Outside Diameter of hub 5" and smaller  +2.4mm, -0.8mm﹡
6" and larger  +4.0mm, -0.8mm
Diameter of contact face 1/16" rasied face tongue and groove male, female  ±0.8mm
1/4" rasied face tongue and groove male, female  ±0.4mm
Diameter of counterbore same as for inside diameter
Drilling Bolt circle ±1.6mm
Bolt hole spacing ±0.8mm
Eccentricity of bolt circle with respect to facing 2 1/2" and smaller: 0.8mm, max﹡
Eccentricity of bolt circle with respect to bore 3" and larger: 1.6mm, max﹡
Thickness 18" and smaller  +3.2mm, -0mm
20" and larger  +4.8mm, -0mm
Length of thru hub 10" and smaller  ±1.6mm
12" and larger  ±3.2mm
A flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system.
View more flanges as below:

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