The typical flange face finish for ASME B16.5 RF flanges is 125 to 250 µin Ra (3 to 6 µm Ra). ASTM A182, ASME B16.5 Sch10S / 40S / 80S / Std. 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 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. 125 - 250 RMS fine serrated finish. These two are the units used to measure the roughness of the flange face. Deviation from these specific requirements may affect product performance or longevity 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. $97.28 #4. Cold Water Finish The flange face appears as mirror like. This finish is usually difficult or impossible to create in non-circular flanges. Cold Water Finish The flange face appears as mirror like. 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. Non-Metallic Gaskets Soft gaskets, such as compressed fibre sheet and rubber can be more forgiving to This allows for various grades of surface finish to be made available by flange manufacturers for the gasket contact surface of metal flanges. Stock Finish:This is a continuous spiral or phonographic groove. Offered in both standard and custom configurations, we manage the entire fabrication process in-house to provide fast turnaround and economical pricing. 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 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. We'll bring you the most relevant peer-to-peer conversations happening in the trade and tips and tricks to help you get the job done. Raised face, smooth finish (125-250 RMS / 3.2-6.3 µm) = Sch 40S/Std = Sch 10S x = Sch 10S / 40S / 80S. Fabrication: CNC Laser, Waterjet, Plasma, Welding & Fab, Schaublin, Cazeneuve, Weiler, Graziano, Mori Seiki Lathes, Cincinnati Milacron, Kearney Trecker, VN, USA Heavy Iron, Machine Reconditioning, Scraping and Inspection, Tooling, Parts and Accessories For Sale or Wanted, Machinery Manual, Brochure and Photo Archives. $170.48 #6. 250-500 AARH (it is called stock finish) is specified for soft gaskets such as NON Asbestos, Graphite sheets, Elastomers etc. 125 to 250 microinch finish may be approximated with a 0.015 t0 0.020" feed per rev with a 0.062 tool radius. Sign up for our eNewsletter now to stay in-the-know. In case of sale of your personal information, you may opt out by sending us an email via our Contact Us page. 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. The customer may specify a different finish for special applications. The AARH/RMS finish typically ranges from 125- to 250-μin. ASTM A182, ASME B16.5 Sch 10S / 40S / 80S / Std. A 90 degree inclined angle tool is used to make the grove. 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 Resources to help you determine the right solution for your application. Practical Machinist is the easiest way to learn new techniques, get answers quickly and discuss common challenges with your peers. All Rights reserved. The finish spec represents a tool mark trough to cusp height. We can provide 250 - 500 RMS coarse serration upon request. 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. A…We recommend the flange finish conform, whenever possible, to 30-55 serrations per inch, in a concentric or spiral pattern, cut with a 1/16" radius, round-nosed tool. Register for the worlds largest manufacturing technology forum for free today to stay in the know. This will result in a roughness between Ra 3.2 and 6.3 micrometers (125 - 250 micro inch). The finish spec represents a tool mark trough to cusp height. The most common value of a serrated face is 120-250 AARH. flange finish or bolting and assembly deficiencies. Surface finishes of flange facing. Hydrogen Service Finish The finish for flanges in hydrogen service is very smooth, typically between Ra 2 and 3.2 micrometers (79 - 125 microinch). Flange Facing : The finish of contact faces of pipe flanges and connecting end flanges of fittings shall be judges by visual comparison with Rastandards (See ANSI, ASME B46.1) and not by instruments having stylus tracers and electronic amplification, the finishes required are given below.Other finishes maybe furnished by agreement between user and manufacturer. You accept the use of cookies or other identifiers by closing or dismissing this notice, by scrolling this page, by clicking a link or button or by continuing to browse otherwise. This website or its third-party tools process personal data (e.g. The roughness of the finish is from 125-250 microinch. To find out more about the categories of personal information collected and the purposes for which such information will be used, please refer to our privacy policy. The AARH/RMS fi nish typically ranges from 125- to 250-µin. Machining surface finish chart, comparator, method, degree, Ra, Rz, RMS As for machining to iron and steel castings, the surface finish smooth degree is also an important requirement. 125-250 AARH (it is called smooth finish) is specified for Spiral Wound Gaskets. It is used to measure the roughness (rather smoothness) of surfaces. Now the measurement value of Serration of flange face is specified in RMS (Root Mean Square) or AARH (Arithmetic Average Rough Height). 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). 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. The Standard Flange Facing for ASME B16.5 and ASME B16.47 is a 125-250 RMS Finish. This finish is usually difficult or impossible to create in non-circular flanges. Product code examples: A 125 Ra or RMS finish is what one normally considers a standard machined finish as opposed to a 250 which would be rough. This fi nish is suitable for gaskets that have a soft conformable face. The typical flange face finish for ASME B16.5 RF flanges is 125 to 250 µin Ra (3 to 6 µm Ra). Surface Finish Gauge #5. 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. This will result in a roughness between Ra 3.2 and 6.3 micrometers (125 - 250 microinch). Finish (Mill or serrated) 6. The most common flange finish for ASME B16.5 RF flanges is 125 to 250 micron Ra (3 to 6 micron Ra). 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). 125 AARH means 125 micro inches will be the average height of the ups and downs of the surface. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Many years of making these very same flange finished have boiled it down almost to a cook book entry for me. Powered by vBulletin® Version 4.2.5 We offer serrated (125 / 250 RMS typical) or mill finishes by default, as well as the option between flat face, raised face, octagonal, or RTJ flanges, and material options include Carbon Steel, … The cutting tool employed should have an approximate 1.5 mm [0.06″] or larger radius, and there should be from 1.8 grooves / mm through 2.2 grooves / mm [45 grooves / inch through 55 … 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. Hydrogen Service Finish The finish for flanges in hydrogen service is very smooth, typically between Ra 2 and 3.2 micrometers (79 - 125 microinch). QUESTION - How do you measure this roughness? Many years of making these very same flange finished have boiled it down almost to a cook book entry for me. 125 to 250 microinch finish may be approximated with a 0.015 t0 0.020" feed per rev with a 0.062 tool radius. browsing data or IP addresses) and use cookies or other identifiers, which are necessary for its functioning and required to achieve the purposes illustrated in the cookie policy. To learn more, please refer to the cookie policy. According to ASME standards the serrated, serrated spiral and concentric flange face finish should have an average roughness … Spiral Serrated - This is similar to a stock finish but the difference between them is the way the grove is made. I can not seem to purchase a comparitor gauge - or use my electronic styllus instrument. Pipe Flange Facing Finish ... – 125-250 uin for serrated finish (45-55 grooves/in) American Society of Mechanical Engrs ... testing in Section 5.2.4 • Roughness values in units of "uin RMS" • Suggested that this be revised to more common parameter Ra, since use of RMS values has been discontinued and is not the same as the Rq or 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). Suitable for practically all general service con- ditions, it is the most widely used of any fl ange surface fi nish. Cold Water Finish The flange face appears as mirror like. HHIP 4101-0030 Surface Roughness Standards Composite Set 1.0 out of 5 stars 1. AMSE Standards for Surface Roughness in Flange The surface finish as the flange face plays a key role in gasket’s reliability and service life. © 2021 Copyright Practicalmachinist.com. A typical flange surface finish recommendation for these types of metal-contact gaskets is 64-µin Arithmetic Average Roughness Height (AARH)/Root Mean Square (RMS) or smoother. A serrated finish, either concentric or spiral, is required with 30 to 55 grooves per inch and a resultant roughness between 125 and 500 microinches. If we use smooth finish for soft gaskets enough "biting … Gar Surface Roughness Scale C-9 Cast Mocrofinish Surface Comparator 4.3 out of 5 stars 5. The most common flange finish for ASME B16.5 RF flanges is 125 to 250 micron Ra (3 to 6 micron Ra). © 2009-2021 Garlock Family of Companies, All Rights Reserved. Surface Roughness Conversion Chart Tables- … The latest industry news—straight to your inbox. At Signal Flange we have been manufacturing high-quality carbon plate flanges for more than 35 years. 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. 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. Surface Finish Comparator-Nickel 1.8 out of … ... Flange rating 4. Expansion Joint Preventative Maintenance & Reliability Service, Engineering, Procurement, and Construction, OEM Services for Demanding Industrial Sealing Applications, Garlock Fluid Sealing Academy (GFSA) Training, Garlock Middle East And Africa - Dubai, UAE. This finish is suitable for gaskets that have a soft conformable face. Thickness 7. Copyright © 2021 vBulletin Solutions, Inc. All rights reserved. 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: Learn more about us. With more than 10.6 million unique visitors over the last year, Practical Machinist is the most visited site for metalworking professionals. Raised face, smooth finish (125-250 RMS / 3.2-6.3 µm) = Sch 40S/Std = Sch 80S = Sch 10S S.P.I. This will result in a roughness between Ra 3.2 and 6.3 micrometers (125 - 250 microinch). All blinds are stamped with line size and flange rating, and ground to provide smooth edges. 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: Examples: flange finish for ASME B16.5 RF flanges is 125 to 250 µin (... To measure the roughness ( rather smoothness ) of surfaces smooth edges out of … 125 - 250 microinch may. Please refer to the cookie policy determine the right solution for your application or impossible to create in non-circular.. Is 120-250 AARH in case of sale of your personal information, you may opt out by sending an. Policy and Terms of service apply eNewsletter now to stay in-the-know tips and tricks to you! 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Ditions, it is the most common flange finish for ASME B16.5 RF flanges is 125 to µin! Spiral or phonographic groove available by flange manufacturers for the gasket contact surface of flanges... Specified for soft gaskets such as NON Asbestos, Graphite sheets, Elastomers etc get the done. Of … 125 - 250 microinch finish may be approximated with a tool... Solution for your application stock finish ) is specified for spiral Wound gaskets, ASME B16.5 Sch 10S 40S. Of any fl ange surface fi nish typically ranges from 125- to 250-µin Privacy policy and Terms service. Last year, Practical Machinist is the most common value of a serrated face is 120-250 AARH same. Or longevity surface finishes of flange Facing a 90 degree inclined angle tool is used to measure roughness! ( 3 to 6 micron Ra ) our contact us page flange manufacturers for the worlds largest manufacturing forum... 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