clamping system and a 1” to 10” I.D. It's one of the 3 major types: Flat, Concentric, and Phonographic. A serrated finish, either concentric or spiral, is required with 30 to 55 grooves per inch and a resultant roughness between 125 and 500 micro inches. Complete flow of gasket material must reach to the bottom of the ‘valley” surface in a phonographic finish to avoid a spiral leak path from one end of the spiral to the outside. Flange Face Finish. Oversized ring gear accommodates extremely high torque levels for challenging flange repair applications, and these machines are able to generate a phonographic finish. In a bolted flange joint, the flange face is in direct contact with the gasket. The facing finish or face finish of a pipe flange manufactured in accordance with ASME B16.5 refers to the smoothness or roughness of the facing surface. Face Finish Flange face finish The ASME B16.5 code requires that the flange face (raised face and flat face) has a specific roughness to ensure that this surface be compatible with the gasket and provide a high quality seal. Manual feeding for rapid positioning is … An example would be ANSI B16.5 which specifies face finishes within a range 125AARH - 500AARH (3.2 Ra to 12.5 Ra). An easy to use manually operated tool for re-facing damaged flanges and restoring them to like-new condition with a phonographic finish, virtually anywhere, is being introduced by Esco Tool of Holliston, Massachusetts. A phonographic finish is more difficult to seal than a concentric serrated finish. The Esco FLANGE HOG 110® is a manually operated hand tool with a rigid I.D. Both radial and axial feed is achieved with a pneumatic feedbox. […] The flange face finish is determined by the standard used and measured as an Arithmetical Average Roughness Height (AARH). Cold Water - It has a mirror like finish. Your customer doesn't even know what a phonographic finish is! As others have said, it's a flange finish for pressure retaining fittings. But a machined finish added to the raised face on a flange to give an extra level of security to prevent leaks and maintain effective seals. The Standard Facing for the B16.5 and B16.47 Flanges is known as a Phonographic Finish which is a continuous groove which is generated by using a 1/16” Radius round nosed tool with a cutting speed of 1/32” per revolution, this results in a 125-250 RMS finish. The ASME B16.5 code requires that the flange face (raised face and flat face) has a specific roughness to ensure that this surface be compatible with the gasket and provide a high quality seal. The flange face is the surface area that hosts the gasket. Flanges with different faces require different gaskets and shall never be mated to prevent leakage of the joint. The typical flange face finish for ASME B16.5 RF flanges is 125 to 250 µin Ra (3 to 6 µm Ra). 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