The flanges shown are adequate for water service of 250 psi working pressure and should not be confused with class 250 flanges per ANSI B16.1. The bolt circle and the bolt holes match those of ANSI B16.1 class 125. If flanges are required to be made in accordance with other ratings or other standards, this must be specified on the purchase order. 24" and smaller flanges are rated equal to the fittings to which they are attached and are adequate for water service of greater than 350 psi only with the use of American`s Toruseal gaskets.
Facing: Flanges are plain faced and are finished smooth or with shallow serrations (AMERICAN’s option).
Back facing: Flanges may be back faced or spot faced (AMERICAN’s option), for compliance with the flange thickness tolerance.
Drilling: Drilling of flanges can be rotated when required; for those sizes with an even number of bolt holes in each quadrant, the fitting can be rotated 45° with standard drilling.