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. Flexible and Versatile. clamping system and a 1” to 10” I.D. 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. Cold Water - It has a mirror like finish. Flanges with different faces require different gaskets and shall never be mated to prevent leakage of the joint. 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. 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. In a bolted flange joint, the flange face is in direct contact with the gasket. It's one of the 3 major types: Flat, Concentric, and Phonographic. As others have said, it's a flange finish for pressure retaining fittings. An example would be ANSI B16.5 which specifies face finishes within a range 125AARH - 500AARH (3.2 Ra to 12.5 Ra). The flange face is the surface area that hosts the gasket. […] A phonographic finish is more difficult to seal than a concentric serrated finish. Both radial and axial feed is achieved with a pneumatic feedbox. Steel flanges are available with four basic face finish, however, the common objective of any type of flange face finish is to create the desired roughness on the face of a flange to ensure a strong match between the flange, the gasket, and the mating flange and thus provide a high-quality seal. The 6 available types of flange face are flat (FF), raised (RF), ring joint (RTJ), lap joint, male and female (M&F), tongue and groove (T&G). 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. 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. The flange face finish is determined by the standard used and measured as an Arithmetical Average Roughness Height (AARH). Oversized ring gear accommodates extremely high torque levels for challenging flange repair applications, and these machines are able to generate a phonographic finish. The Esco FLANGE HOG 110® is a manually operated hand tool with a rigid I.D. For the height measures H and B of all described dimensions of flanges on this website, with exception of the Lap Joint flange, it is important to understand and remember the following: Your customer doesn't even know what a phonographic finish is! Flat is used for low pressure only, less than class 100. 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. Manual feeding for rapid positioning is … 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. 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