American standard : cast-iron pipe flanges and flanged fittings : all sizes for maximum working saturated steam pressure of 250 Lb. per Sq. In. (Gage) ; Sizes 10 inches and smaller for maximum non-shock fluids (other than steam) working hydraulic pressure of 325 Lb. per Sq. In. (Gage) at a temperature of 250 Deg. Fahr. ; Sizes 10 inches and smaller for maximum non-shock working hydraulic pressure of 400 Lb. per Sq. In. (Gage), at or near the ordinary range of air temperatures / sponsor organizations, Heating and Piping Contractors National Association, Manufacturers Standardization Society of the Valve and Fittings Industry, the American Society of Mechanical Engineers.