Under compression, the soft face will embed into this finish, which helps create a seal, and a high level of friction is generated between the mating surfaces. The most common value of a serrated face is 120-250 AARH. The Standard Flange Facing for ASME B16.5 and ASME B16.47 is a 125-250 RMS Finish. Gar Surface Roughness Scale C-9 Cast Mocrofinish Surface Comparator 4.3 out of 5 stars 5. Powered by vBulletin® Version 4.2.5 The raised face or flat face shall be furnished with a serrated concentric or serrated spiral finish having a resultant surface roughness from 3.2μm to 6.3μm. Thickness 7. We recommend that machined surfaces which can not be serrated have a surface finish with a multi-directional lay and roughness of 125-250 micro-inch RMS. Material type 5. The cutting tool employed should have an approximate 1.5 mm or larger radius, and there should be from 1.8 grooves/ mm through 2.2 grooves/ mm. For FF and RF facing, either a serrated concentric or serrated spiral finish having a resultant surface finish from 3.2 μm to 6.3 μm [125 μinch to 250μinch] average roughness shall be furnished. This finish is suitable for gaskets that have a soft conformable face. 125 AARH means 125 micro inches will be the average height of the ups and downs of the surface. The finish spec represents a tool mark trough to cusp height. © 2009-2021 Garlock Family of Companies, All Rights Reserved. Machining of gasket faces of flanges to a smooth finish of Ra = 3.2 - 6.3 micrometer (= 125 - 250 microinches AARH) AARH stands for Arithmetic Average Roughness Height. Surface Finish Gauge #5. ASTM A182, ASME B16.5 Sch 10S / 40S / 80S / Std. Stock Finish:This is a continuous spiral or phonographic groove. All blinds are stamped with line size and flange rating, and ground to provide smooth edges. ASTM A182, ASME B16.5 Sch10S / 40S / 80S / Std. The customer may specify a different finish for special applications. The AARH/RMS fi nish typically ranges from 125- to 250-µin. Cold Water Finish The flange face appears as mirror like. The raised face is, according to ASME B16.5, the default flange face finish for manufacturers (this means that buyer shall specify in the order if another flange face is required, as flat face or ring joint). This will result in a roughness between Ra 3.2 and 6.3 micrometers (125 - 250 microinch). According to ASME B16.5 and related codes - the flange finish for a raised face shall be 125-250 micro-inches with a sprial serrated finish. 125 to 250 microinch finish may be approximated with a 0.015 t0 0.020" feed per rev with a 0.062 tool radius. Hydrogen Service Finish The finish for flanges in hydrogen service is very smooth, typically between Ra 2 and 3.2 micrometers (79 - 125 microinch). The torque figures above are based on a flange surface finish between 125 -250 rms finish, surface flatness within 0.020” tolerance and no misaligned flanges. QUESTION - How do you measure this roughness? 250-500 AARH (it is called stock finish) is specified for soft gaskets such as NON Asbestos, Graphite sheets, Elastomers etc. This fi nish is suitable for gaskets that have a soft conformable face. This will result in a roughness between Ra 3.2 and 6.3 micrometers (125 - 250 micro inch). This finish is usually difficult or impossible to create in non-circular flanges. The roughness of the finish is from 125-250 microinch. Many years of making these very same flange finished have boiled it down almost to a cook book entry for me. All Rights reserved. On the other hand 63 would be fine, 32 cannot easily be obtained by machining and has to be ground, 16 absolutely has to be ground, etc. The AARH/RMS finish typically ranges from 125- to 250-μin. Flange Facing: Raised, Flat, Ring Joint Rating/Class: 150, 300, 600, 900, 1500, 2500 Surface Finish: 16-32, flange finish 125-250 RMS Lagging: 2˝: if U-dimension is <3˝ 3˝: if U-dimension is >3˝ Cap and Chain: Brass, SS TABLE 1 OPTIONS CODE Stamp tag number on thermowell NF SS tag wired to thermowell NH Hydrostatic test-external W4 Suitable for practically all general service con- ditions, it is the most widely used of any fl ange surface fi nish. Hydrogen Service Finish The finish for flanges in hydrogen service is very smooth, typically between Ra 2 and 3.2 micrometers (79 - 125 micro inch). The Flat Faced Flange gasket surface covers the entire face of the Flange from the bore to the outer edge of the Flange, these Flanges utilize a Full Face gasket made of a soft non asbestos material. The most common flange finish for ASME B16.5 RF flanges is 125 to 250 micron Ra (3 to 6 micron Ra). Raised face, smooth finish (125-250 RMS / 3.2-6.3 µm) = Sch 40S/Std = Sch 10S x = Sch 10S / 40S / 80S. The latest industry news—straight to your inbox. $170.48 #6. 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. Years of making these very same flange finished have boiled it down almost a... In both Standard and custom configurations, we manage the entire fabrication process in-house to provide smooth.... Ange surface fi nish is suitable for gaskets that have a soft conformable face in flanges... In non-circular flanges the typical flange face appears as mirror like cusp height of... And related codes - the flange face appears as mirror like downs of the ups and downs the! Called smooth finish ) is specified for soft gaskets such as NON,... 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