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Flat is used for low pressure only, less than class 100. 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 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. Flexible and Versatile. Your customer doesn't even know what a phonographic finish is! The flange face finish is determined by the standard used and measured as an Arithmetical Average Roughness Height (AARH). 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. 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 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. 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. As others have said, it's a flange finish for pressure retaining fittings. Manual feeding for rapid positioning is … 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. A phonographic finish is more difficult to seal than a concentric serrated finish. 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). 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). 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: Flange Face Finish. Both radial and axial feed is achieved with a pneumatic feedbox. In a bolted flange joint, the flange face is in direct contact with the gasket. 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. The flange face is the surface area that hosts the gasket. 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