Intro: 

The flange facing most commonly used is the "raised face." It is referred to as a raised face because the gasket surfaces are raised .060" or .250" above the bolting circle face. Pressure rating of the flange determines the height of the raised face. The "flat face" or "full face" flange has a gasket surface in the same plane as the bolting circle face. Applications using flat face flanges or full face flanges are frequently those in which the mating flange or flanged fitting is made from a casting.

Raised and flat flange facings are machined and may be either phonographic serrated or concentric serrated. The industry standard is a phonographic serrated finish. The facing finish is judged by visual comparison with Roughness Average (Ra) standards. Ra is stated in microinches (µin) or micrometers (µm) and is shown as an Arithmetic Average Roughness Height (AARH) or Root Mean Square (RMS). AARH and RMS are different methods of calculation giving essentially the same result and are used interchangeably for these products.

Facings for tongue and groove or male and female faces are provided in accordance with customer requirements.

.We provides ASME Code and Non Code Industrial flanges for the Petrochemical, Process, & Waterworks industries. ANSI, API, AWWA pipe flanges in carbon, stainless, alloys and chrome steel. Weld Neck, Slip on, Blind, Threaded, socket weld, Lap Joint, Orifice Flanges in sizes 1/2" to 198".