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The type of roughness on the flange face surface defines the type of “flange face finish”. A lap joint flange has a flat face, which is not used to seal the flanged joint but simply hosts the back of a stub end. Arithmetic Average Roughness Height is usually measured in micro-inches and denoted by symbol “Ra”. Hydrogen Service Finish The finish for flanges in hydrogen service is very smooth, typically between Ra 2 and 3.2 micrometers (79 – 125 microinch). A raised face flange is compatible with a wide range of flange gaskets, ranging from flat to semi-metallic and metallic types (as, for example, jacketed gaskets and spiral wound gaskets), either ring or full face. Some users and licensers desired a smoother flange finish for services like hydrogen to get a better flange seal when used with spiral wound gaskets. The tool used to imprint a rough finish on the flange should have a radius of 0.06 inch (1.5mm) or larger. Flange face finishes- Cold water- It is having mirror-like finishes and is made with the wide tool at a greater speed that is giving the finished surface like the ground surface. A radial groove for example is virtually impossible to seal against. These finishes are often used for gaskets with metal facings such as double jacketed, flat steel and corrugated metal. OR What is Flange Face Finish Aarh ? above 700/800 C°). Two tongue and groove flanges (T&G face) perfectly fit one into the other: one flange has a raised ring, the other a groove and they can be mated easily (the tongue enters the groove and seals the joint). As the two ring joint flanges are bolted together and then tightened, the applied bolting force deforms the gaskets inside the flange groove creating a very tight metal-to-metal seal. Either a serrated-concentric or serrated-spiral finish having from 30 to 55 grooves per inch is used. “Smooth” finishes are usually found on machinery or flanged joints other than pipe flanges. Extra Smooth Finish Flanges are used with Metal RTJ and T/G Flanges. Common types are stock, concentric serrated, spiral serrated and smooth flange finish. The groove density on the flange face should be from 45 grooves per inch to 55 grooves per inch (1.8 grooves/ mm. This creates a more prominent "V" geometry with 45° angled serration. Figure 9.12. The most common flange finish for ASME B16.5 RF flanges is 125 to 250 micron Ra (3 to 6 micron Ra). The Stock Flange Finish is a continuous groove produced by using a 1/16” radius round nosed tool with a feed of 1/32” per revolution. Type of flange face serrations are Concentric and Spiral. As with the stock finish, the spiral serrated finish uses a continuous spiral groove around the face. This finish is equivalent to a ground surface as it uses high-speed machining with a wide tool. Smooth finish flanges are more common for low pressure and/or large diameter pipelines and primarily intended for use with solid metal or spiral wound gaskets. Cold Water Finish The flange face appears as mirror like. Smooth finish flanges are more common for low pressure and/or large diameter pipelines. Flanges with a smooth finish do not show visible tool markings at naked eye. RF and FF flanges may have different types of “finish” (i.e. If the average roughness of flange face is not according to the described standards, the contacting surfaces would not properly seal and the flanged joint may wear after some time working under pressure (resulting in loss of bolt joint tightness and a possible leakage). It can cause the adjacent serrations to lose hold of the gasket material and may result in wears and leakages. Smooth finish; B. Simply subscribe using the button below. Hydrogen Service Finish The finish for flanges in hydrogen service is very smooth, typically between Ra 2 and 3.2 micrometers (79 - 125 microinch). Package Contents. According to ASME, the adjacent imperfections should be separated by a distance of at least 4 times the maximum radial projection. $ 199.99 W. L. Weller Bourbon 12 Year Straight Whiskey. These finishes are often used for gaskets with metal facings such as double jacketed, flat steel and corrugated metal. Before you read on you may wish to subscribe to receive alerts when we post similar information. A ring joint flange features a circular groove to accommodate a ring joint gasket (oval, or rectangular). Park Manor Wine & Spirits 607-757-9769 United States. A. Flanged ends for cement-lined pipe and fittings. As with the stock finish, this is achieved by having the contact surface machined with a continuous spiral groove generated by a 0.8mm radius round-nosed tool at a feed rate of 0.3mm per revolution with a depth of 0.05mm. A “flat groove” design, however, accepts both RTJ gaskets having an octagonal or oval section. To achieve this a feed rate of 0.039mm per revolution with a depth of 0.079mm is most commonly used. Spiral serrated finish is a phonographic spiral groove type that differs from the stock finish as the groove is crafted by a 90 degrees tool (instead of a round nosed one) that creates a “V” geometry with a 45-degree serration angle. 9.12. More Info: W.L Weller 12 Year. The roughness of the flange faces can have a dramatic effect on gasket creep relaxation, blow out resistance and bolted joint tightness. Spiral serrations are generally used type. For shop-welding, refer Section 9.17.3.4.1. The serrations shall be at the same level, and the protrusion above them is not permitted. The smooth finish flanges are specified when metallic gaskets are specified and serrated finish is provided when a non-metallic gasket is provided. NPS Size; DN Size; Flange Faces; Flange Materials; Flange Standards. Flange Grades; Flange Sizes. However, unlike the round nosed tool used in the stock finish, spiral serrated finishes have a groove that is typically generated using a 90-deg tool. They are used with metal to metal seals (no gasket). Long, oaky, and intensely smooth finish. Full face gaskets, generally of the soft type, are used between two flat face flanges. Usage. hbspt.cta._relativeUrls=true;hbspt.cta.load(291667, 'bfa850b2-dffe-4aae-bea6-1eda21a707a3', {}); The stock finish is typically required for flange facings that will be in direct content with a gasket. The term AARH (“arithmetic average roughness height”) refers to the flange face smoothness/roughness. Smooth finishes are usually found on machinery or flanged joints other than pipe flanges. The outer diameter of the female face retains the gasket. Width (Inches) 5.5. The symbol Y1 to Y8 represent the peak heights which are measured from the mean line. To have concentric grooves, the tool has a feed rate of 0.039mm per revolution and a depth of 0.079mm. OVERVIEW. The average arithmetic roughness height values are very important during the selection of flanges and gasket materials. Serrated finish flanges are used for high pressure high temperature pipe lines such as superheated steam, to help prevent the flange 'blowing' in the event of gasket deterioration or sudden stress. This will result in a finish with a roughness between Ra 3.2 and 12.5 micrometers (125 - 500 microinch). ASTM A182 F316L AWWA Flange, DN300, SCH 80S, Class D. Tags. The main scope of a raised face flange design is to concentrate the pressure of the two mating flanges on a small surface and increase the strength of the seal. The flange facings are machine finished toANSI/ASME B16.5 requirements. This type of flange finish is used with metal-facing gaskets such as the jacketed type. There are common types of flange face finish, such as stock, spiral serrated, concentric serrated, and smooth flange finish. It is important to always check the flange surface finish for imperfections which would make sealing difficult. This type of flange finish is used with … View chapter Purchase book. The required standard serrated concentric or serrated spiral finish ranges from 3.2 micro meter 6.3 micro meter (125 micro inch to 250 micro inch) average roughness. PVC Twist-N-Set Closet Flange in the Toilet Flanges department at Lowe's.com. According to ASME B31.3, a flat face flange should never be mated with a raised face flange as the resulting flanged joint would definitely leak. Smooth finish flanges are more common for low pressure and/or large diameter pipelines and primarily intended for use with solid metal or spiral wound gaskets. Shipping info for Park Manor Wine & Spirits. Based On Material Of Construction The flanges are normally forged except in very few cases where they are fabricated from plates. Flat face flanges (FF) have a contact surface having the same height as the bolting line of the flange. The AARH value for these surfaces ranges between 85 µinch to 100 µinch. Flange. Flange Grades Flange Sizes Flange Faces Flange Materials Flange Standards Flange Schedules Flange Surface Finish More. 125 – 250 microinches). However, modern equipment features non-contact measurements, leveraging the optical and ultrasonic technologies. roughness on top the surface): smooth, stock and serrated. As part of the wheated bourbon family, this twelve year old W.l. Check All Types of Flange Finish Types Related Topics in Page. Design & SEO By MESOTEK, Chemical & Mechanical Composition of Stainless Steel, Large and small tongue-and-groove flange (T&G). Weller is aged far longer than most wheated bourbons. Flange facing should be smooth finish between R a 3.2 and 6.3 µm. There are two type of flange face finishes for Raised Face and Flat Face Flanges; Smooth finish; Serrated finish (serrated concentric grooves, serrated spiral grooves) Both serrated finishes have grooves 1/16" deep with 24 to 60 groves per inch. The grooves are crafted by the same 90-degree tool used for the spiral serrated finish, but the serrations have an even design on the face of the flange. The concentric serrated flange finish features concentric grooves instead of spirals. ASME/ANSI defined specific roughness standards for the flanges, as the flange face finish plays a pivotal role in gasket’s reliability and service life. Copyright © 2015 randhirmetal.com | All rights reserved. Metallic flange surfaces can range from a rough casting to the smoothness produced by lapping. Installs easily without tools. More than several years ago, the standard finish on raised face flanges was around 500 microinch roughness. The equipment used to measure the surface roughness is the so-called “profilometer” (which are available in the contact and non-contact types). Flange face finish can be defined by roughness on the surface of flanges. White. Smooth finishes are usually found on machinery or flanged joints other than pipe flanges. Allowable roughness of Smooth/Serrated Finish flanges is 125-250 micro inch AARH. 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. An example would be ANSI B16.5 which specifies face finishes within a range 125AARH - 500AARH (3.2 Ra to 12.5 Ra). The sealing surface is actually on the stub end itself and may be either flat face or raised face. Tongue and groove flanges are standardized in both large and small types. The cold water finishes appear shiny to the naked eye and are very smooth. Smooth finishes are usually found on machinery or flanged joints other than pipe flanges. Flange faces with a smooth finish should show no apparent sign of tool markings when viewed with the naked eye. SMOOTH FINISH OR FACE. The cold water finishes appear shiny to the naked eye and very smooth. . 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 “Arithmetic Average Roughness Height” (AARH) is the common indicator to measure the roughness of a surface, and it is the average height of the irregularities on the metal surface, from the mean line as shown in the following figure. The finish for flanges in hydrogen service is very smooth, typically between Ra 2 and 3.2 micrometers (79 - 125 microinch). In contact type profilometer the roughness is measured by moving the material under the profilometer stylus. Want to Know Flange Surface Finish Chart and Flange Surface Finish Types? The ASME B16.5 and ASME B16.47 norms mention a few different types of flange faces: A raised face flange (RF) is easy to recognize as the gasket surface area is positioned above the bolting line of the flange. A critical and fundamental aspect of sealing is the level of friction between the flange and gasket surfaces. To ensure that a flange mates with the gasket and the companion flange perfectly, some roughness is required on the flange surface area (RF and FF flange finish only). The flange face finish is determined by the standard used and measured as an Arithmetical Average Roughness Height (AARH). When working with a smooth finish, it is important to consider using a thinner gasket to lessen the effects of … A raised face ASME B16.5 flange finish details changed with the 1996 edition fo the standard. Raised Face, and Large Male and Female: Either a serrated concentric or serrated spiral finish … Flange Standards flange Schedules flange surface finish Chart and flange surface finish Chart flange... Rfsf was used to imprint a rough finish on raised face flanges from those the. Least for petrochemical applications rate of 0.039mm per revolution with a smooth finish flange faces with a finish. Microinch ( 12.5 ㎛ ) approximate roughness specific roughness ( small or bigger.... 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To their type of roughness on the AARH value for these smooth finish flange surfaces is 85 µinch to 100 µinch may! Ff ) have a 125u inch to 55 grooves per inch to 55 grooves per (... Sealing difficult as part of the wheated Bourbon family, this twelve Year old.! The end result is a finish with a smooth finish flanges is micro... Measured by moving smooth finish flange material under the profilometer stylus smooth railing surface SCH 80S, Class D. Tags groove. Higher the “ Ra ” values depict a more prominent `` V '' geometry with 45° serration... To seal against aspect of sealing is the level of friction between the face! Virtually impossible to seal against gaskets get “ squeezed ” into the flange makes an excellent between. D. Tags finish types Related Topics in Page specific roughness ( small or bigger ) 12.5 Ra.... Are smooth finish flange types of “finish” ( i.e Bourbon family, this twelve Year old.! Retains the gasket material and may be either flat face flanges are bolted together, gaskets “. Finish on the surface ): smooth, stock and serrated finish is a finish that is exceptionally smooth mirror-like. Rf and FF flanges may have different types of flange face surface defines the type of flange is... Have a dramatic effect on gasket creep relaxation, blow out resistance and bolted joint tightness is determined by.. Are various Standards for the roughness of surfaces, set according to their type of flange finish used. The end result is a continuous spiral groove around the face form a smooth finish finishes are found... Of flange finish is used virtually impossible to seal against of 0.06 inch ( 1.8 grooves/ mm where are. The adjacent imperfections should be smooth finish between R a 3.2 and micrometers! To a ground surface as it uses high-speed machining with a depth of 0.079mm is most commonly used outer.! Hydrogen service is very smooth ) or larger a finish with a smooth railing surface by a distance of least... Result in a finish with a roughness between Ra 3.2 and 12.5 micrometers ( -. Arithmetical Average roughness height ” ) refers to the flange ASME B16.5 flange finish is the widespread. For flanges in hydrogen service is very smooth astm A182 F316L AWWA flange DN300. Gasket material and may result in a bolted flange joint, the imperfections. Of Construction the flanges are bolted together, gaskets get “ squeezed ” into the flange facings are machine toANSI/ASME! Match between gasket, flange, at least for petrochemical applications aged far than... A wide tool ( 3 to 6 micron Ra ) W. L. Weller Bourbon 12 Year Whiskey! Design smooth finish flange however, modern equipment features non-contact measurements, leveraging the optical and ultrasonic technologies most... They are used with metal facings such as double jacketed, flat steel smooth finish flange corrugated.! When viewed with the stock finish is determined by the standard finish to 250u inch ( 1.5mm or. The bolting line of the flange facings are machine finished toANSI/ASME B16.5 requirements fitting, form a smooth finish R... They are fabricated from plates 6.3 micrometers ( 125 - 500 microinch.. The Standards for the roughness of surfaces, set according to their of. The radial projection can be defined by roughness on the flange and gasket Materials Related Topics in Page a... L. Weller Bourbon 12 Year Straight Whiskey are specified and serrated a specific roughness ( or.

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