The tool used to imprint a rough finish on the flange should have a radius of 0.06 inch (1.5mm) or larger. NPS Size; DN Size; Flange Faces; Flange Materials; Flange Standards. The American Society of Mechanical Engineers (ASME) has been around for over 130 years and is the standard setter for mechanical engineers in over 100 countries around the world. The pressure embeds the soft face of the gasket into the flange finish and results in the formation of a good seal due to the friction existing between the contacting parts. 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. without a gasket. As with the stock finish, the spiral serrated finish uses a continuous spiral groove around the face. The soft nonmetallic materials such as PTFE may be used for more comfortable facing and better creep resistance. Before you read on you may wish to subscribe to receive alerts when we post similar information. 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 sealing performance of the flanges’ gaskets depends on the AARH, the flange dimensions and the pressure of the stud bolts. Width (Inches) 5.5. See section 6.4.5 for flange finish details. 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. Long, oaky, and intensely smooth finish. The female face is 3/16” deep, while the male face is 1/4″ high, and both of them are smooth finished. “Smooth” finishes are usually found on machinery or flanged joints other than pipe flanges. The concentric serrated flange finish features concentric grooves instead of spirals. Flanges with different faces require different gaskets and shall never be mated to prevent leakage of the joint. 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. Usage. The resultant surface finish has a 500 microinch (12.5 ㎛) approximate roughness. The most common RTJ gasket is the R style with an octagonal section, as it ensures a very strong seal (the oval section is an older type). When working with a smooth finish, it is important to consider using a thinner gasket to lessen the effects of … ... Replaces broken cast iron closet flanges. Smooth unrestricted flow design. Cold Water - It has a mirror like finish. 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. Design & SEO By MESOTEK, Chemical & Mechanical Composition of Stainless Steel, Large and small tongue-and-groove flange (T&G). A radial groove for example is virtually impossible to seal against. However, modern equipment features non-contact measurements, leveraging the optical and ultrasonic technologies. SMOOTH FINISH OR FACE. This flange finish is usually expected to be used with metal to metal contact, i.e. 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. Spiral serrations are generally used type. Shipping info for Park Manor Wine & Spirits. Raised face flanges are the most sold type of flange, at least for petrochemical applications. Flange facing should be smooth finish between R a 3.2 and 6.3 µm. Similarly to tongue and groove flanges, male and female flanges (M&F face type) match one to the other as well. Smooth Finish: The cutting tool employed shall have an approximate 0.06″ radius. This will result in a roughness between Ra 3.2 and 6.3 micrometers (125 - 250 microinch). To make a high-quality seal, the face of the flange makes an excellent match between gasket, flange, and mating flange. The end result is a finish that is exceptionally smooth and mirror-like in its appearance. The finish for flanges in hydrogen service is very smooth, typically between Ra 2 and 3.2 micrometers (79 - 125 microinch). The AARH value for these surfaces ranges between 85 µinch to 100 µinch. Allowable roughness of Smooth/Serrated Finish flanges is 125-250 micro inch AARH. No gasket is used between the flanges. Based On Material Of Construction The flanges are normally forged except in very few cases where they are fabricated from plates. There are common types of flange face finish, such as stock, spiral serrated, concentric serrated, and smooth flange finish. To make this happen, the material of the ring joint gasket has to be softer (more ductile) than the material of the flange. The AARH value for these flange surfaces is 85 µinch to 100 µinch. Place flanges on both ends of shower rod. Flange. As per 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 (that creates a roughness between Ra 3.2 and 6.3 micrometers, i.e. More than several years ago, the standard finish on raised face flanges was around 500 microinch roughness. As the mating flanges are bolted together, gaskets get “squeezed” into the flange face surface and create a very tight seal. The resulting “Ra” value (AARH) for the surface ranges from 125µinch to 500 µinch (125 µm to 12.5 µm). In contact type profilometer the roughness is measured by moving the material under the profilometer stylus. 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. Type of flange face serrations are Concentric and Spiral. OR What is Flange Face Finish Aarh ? These finishes are often used for gaskets with metal facings such as double jacketed, flat steel and corrugated metal. The maximum allowable roughness for Extra Smooth Finish Flanges is 63 micro inch AARH. Package Contents. This type of flange finish is used with … FLANGE FACE TYPES Flange face finish can be defined by roughness on the surface of flanges. As part of the wheated bourbon family, this twelve year old W.l. This will result in a finish with a roughness between Ra 3.2 and 12.5 micrometers (125 - 500 microinch). Weller is aged far longer than most wheated bourbons. Flanges with a smooth finish do not show visible tool markings at naked eye. ASTM A182 F316L AWWA Flange, DN300, SCH 80S, Class D. Tags. The groove density on the flange face should be from 45 grooves per inch to 55 grooves per inch (1.8 grooves/ mm. The resultant surface finish shall have a 125u inch to 250u inch (ANSI B 16.5 para 6.5;4.1). According to the ASME/ANSI specifications, the serrated, spiral serrated, and concentric flange face finish should have an average roughness of 125 µinch to 250 µinch (3.2 µm to 6.3 µm). 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. Cold Water Finish The flange face appears as mirror like. The term RFSF was used to differentiate these smooth face flanges from those with the rougher standard finish. Every material possesses a surface roughness and sometimes surfaces are finished deliberately to have a specific roughness (small or bigger). These finishes are often used for gaskets with metal facings such as double jacketed, flat steel and corrugated metal. OVERVIEW. There are various standards for the roughness of surfaces, set according to their type of application. 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. 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. The most common flange finish for ASME B16.5 RF flanges is 125 to 250 micron Ra (3 to 6 micron Ra). A raised face ASME B16.5 flange finish details changed with the 1996 edition fo the standard. The stock finish is the most widespread type of finish as it suits the large majority of applications. To achieve this a feed rate of 0.039mm per revolution with a depth of 0.079mm is most commonly used. A. The gasket contact surface is crafted using a continuous spiral groove (often referred to as phonographic) using a 1.6mm radius round-nose tool with a feed rate of 0.8mm per revolution and a depth of 0.15mm. This type of flange finish is used with metal-facing gaskets such as the jacketed type. The 514s connect the pipe to the fitting, form a smooth railing surface. Check All Types of Flange Finish Types Related Topics in Page. Flanges with a smooth finish do not show visible tool markings at naked eye. See: Flange Face Finish Type. 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. Twist-n-set replacement closet flange. Smooth finishes are usually found on machinery or flanged joints other than pipe flanges. 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). Smooth finishes are usually found on machinery or flanged joints other than pipe flanges. 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. Smooth finish flanges are more common for low pressure and/or large diameter pipelines. 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). Want to Know Flange Surface Finish Chart and Flange Surface Finish Types? above 700/800 C°). For shop-welding, refer Section 9.17.3.4.1. 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). Metallic flange surfaces can range from a rough casting to the smoothness produced by lapping. The average arithmetic roughness height values are very important during the selection of flanges and gasket materials. 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. Flange Grades; Flange Sizes. without a gasket. 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. Flat face and smooth finish are not the same. 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. White. They are used with metal to metal seals (no gasket). A ring joint flange features a circular groove to accommodate a ring joint gasket (oval, or rectangular). RTJ flanges can be sealed by RTJ gaskets of different styles (R, RX, BX) and profiles (example: octagonal/oval for the R style). One flange has an area extended beyond its face area, the male flange, the other flange has a matching depression machined on the facing surface, the female flange. Flanges with a smooth finish do not show visible tool markings at naked eye. The radial projection can be evaluated by subtracting the inner radius from the outer radius. The height of the raised face depends on the flange pressure rating as defined by the ASME B16.5 specification (for pressure classes 150 and 300, the height is 1.6 mm or 1/16 inch, for classes from 400 to 2500, the raised face height is approximately 6.4 mm, or 1/4 inch). Concentric serrated- 90 Deg incline angle tool is used for making the groove and it is making the groove of 1/64” deeper and about 1/32” into the concentric circles. The outer diameter of the female face retains the gasket. Arithmetic Average Roughness Height is usually measured in micro-inches and denoted by symbol “Ra”. Installs easily without tools. This finish is equivalent to a ground surface as it uses high-speed machining with a wide tool. The cutting tool empolyed has an approximate 0.06 in. $ 199.99 W. L. Weller Bourbon 12 Year Straight Whiskey. Common types are stock, concentric serrated, spiral serrated and smooth flange finish. SMOOTH FINISH OR FACE. Smooth finishes are usually found on machinery or flanged joints other than pipe flanges. Smooth Finish Flange faces with a smooth finish should show no apparent sign of tool markings when viewed with the naked eye. They are used with metal to metal contact. This type of flange finish is used with metal-facing gaskets such as the jacketed type. 2. ... Flange Surface Finish; Smooth Finished; Smooth Finished. Smooth finish; B. A critical and fundamental aspect of sealing is the level of friction between the flange and gasket surfaces. The serrations shall be at the same level, and the protrusion above them is not permitted. The cold water finishes appear shiny to the naked eye and are very smooth. These finishes are often used for gaskets with metal facings such as double jacketed, flat steel and corrugated metal. It can cause the adjacent serrations to lose hold of the gasket material and may result in wears and leakages. View chapter Purchase book. Flat face flanges (FF) have a contact surface having the same height as the bolting line of the flange. Higher the “Ra” values depict a more rough surface, while lower values represent the smoother surface. hbspt.cta._relativeUrls=true;hbspt.cta.load(291667, '9a36f221-cf19-425c-b9bc-bcf4b3929510', {}); 2018 Mirage Machines Limited - All Rights Reserved Mirage Machines Limited is registered in EnglandNumber 2788205, 2018 Mirage Machines Limited - All Rights Reserved Mirage Machines Limited is registered in England, Number 2788205, Guide to Flange Face Surface Finish Types. The flange facings are machine finished toANSI/ASME B16.5 requirements. 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). Terminate a smooth railing surface into a wall. For flanged ends (slip-on) for cement-lined pipe and fittings, see Fig. The sealing surface is actually on the stub end itself and may be either flat face or raised face. 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. 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. 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. The Five basic Finishes for ASME B16.5 and ASME B16.47 Flanges are the Stock Finish, Spiral Serrated Finish, Concentric Serrated Finish, Smooth Finish and Cold Water Finish. To have concentric grooves, the tool has a feed rate of 0.039mm per revolution and a depth of 0.079mm. Stock finish; Flange face finish. 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. Park Manor Wine & Spirits 607-757-9769 United States. . PVC Twist-N-Set Closet Flange in the Toilet Flanges department at Lowe's.com. Too shallow (exceptionally smooth surface finish) and again high compression is required as a leak path then becomes more possible. The Wall Flange Fitting is available in two configurations: 561 / 514-7 comes with the required 514; fittings 561-7 comes without the required 514; fittings The 514 fitting is required when using this component. Flanged ends for cement-lined pipe and fittings. A stock finish face is manufactured using a phonographic spiral groove featuring a 1.6mm radius round-nose tool with a depth of 0.15mm and a feed-rate of 0.8mm per revolution. Copyright © 2015 randhirmetal.com | All rights reserved. Either a serrated-concentric or serrated-spiral finish having from 30 to 55 grooves per inch is used. The type of roughness on the flange face surface defines the type of “flange face finish”. Raised Face, and Large Male and Female: Either a serrated concentric or serrated spiral finish … roughness on top the surface): smooth, stock and serrated. RF and FF flanges may have different types of “finish” (i.e. A ring joint flanges (RTJ) is used when a metal-to-metal seal between the mating flanges is required (which is a condition for high-pressure and high-temperature applications, i.e. Below are the standard surface finish types as determined by ASME. Fluted Flanges (63-F) 63-5-SS – 5’ Stainless Steel Shower Rod Set Polished Finish 1” Diameter Smooth Rod Exposed Screw Mounting Flanges (63-F) 63-5-HD – 5’ Heavy Duty Stainless Steel Shower Rod Set Polished Finish 1” Diameter Fluted Rod Exposed Screw Mounting Flanges (63-F-PB) 1. Smooth finishes are usually found on machinery or flanged joints other than pipe flanges. In a bolted flange joint, the flange face is in direct contact with the gasket. or larger radius. These are the standards for semi-metallic and nonmetallic gaskets. Tongue and groove flanges are standardized in both large and small types. 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. A “flat groove” design, however, accepts both RTJ gaskets having an octagonal or oval section. 9.12. 125 – 250 microinches). Hydrogen Service Finish The finish for flanges in hydrogen service is very smooth, typically between Ra 2 and 3.2 micrometers (79 – 125 microinch). to 2.2 grooves/ mm.). The flange face finish is determined by the standard used and measured as an Arithmetical Average Roughness Height (AARH). According to ASME, the adjacent imperfections should be separated by a distance of at least 4 times the maximum radial projection. Surfaces using a cold water finish are not usually intended to be used with a gasket, meaning the flange faces will be in direct contact. Extra Smooth Finish Flanges are used with Metal RTJ and T/G Flanges. 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. Flange faces with a smooth finish should show no apparent sign of tool markings when viewed with the naked eye. Smooth Finish. The smooth finish flanges are specified when metallic gaskets are specified and serrated finish is provided when a non-metallic gasket is provided. More Info: W.L Weller 12 Year. A serrated finish, concentric or spiral, has from 30 to 55 grooves per inch and roughness between 125 to 250 µinch. Full face gaskets, generally of the soft type, are used between two flat face flanges. It is important to always check the flange surface finish for imperfections which would make sealing difficult. 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. Concentric serrated finishes use the same tooling at the spiral serrated finish although the grooves produced will be concentric grooves that are an equal distance apart rather than a continuous spiral groove. The roughness of the flange faces can have a dramatic effect on gasket creep relaxation, blow out resistance and bolted joint tightness. 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. Hydrogen Service Finish The finish for flanges in hydrogen service is very smooth, typically between Ra 2 and 3.2 micrometers (79 - 125 microinch). This creates a more prominent "V" geometry with 45° angled serration. 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. Figure 9.12. 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. Manufacturer Color/Finish. An example would be ANSI B16.5 which specifies face finishes within a range 125AARH - 500AARH (3.2 Ra to 12.5 Ra). Flange faces with a smooth finish should show no apparent sign of tool markings when viewed with the naked eye. The symbol Y1 to Y8 represent the peak heights which are measured from the mean line. The cold water finishes appear shiny to the naked eye and very smooth. Simply subscribe using the button below. Cold Water Finish The flange face appears as mirror like. This flange finish is usually expected to be used with metal to metal contact, i.e. Flange Grades Flange Sizes Flange Faces Flange Materials Flange Standards Flange Schedules Flange Surface Finish More. ASME set the standards for flange face surface finish types through the ANSI accredited ASME Standard B 16.5 ensuring all gasket and flange fittings are consistent and fit for purpose allowing a high quality seal. The term AARH (“arithmetic average roughness height”) refers to the flange face smoothness/roughness. The equipment used to measure the surface roughness is the so-called “profilometer” (which are available in the contact and non-contact types). The stock finish is suitable for most general surface conditions. 1. 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. For these surfaces smooth finish flange between 85 µinch to 100 µinch or serrated-spiral finish from! Have an approximate 0.06″ radius match between gasket, flange, at least for petrochemical applications the! Outer radius rectangular ) W. L. Weller Bourbon 12 Year Straight Whiskey surfaces ranges between 85 µinch 100. Uses high-speed machining with a roughness between 125 to 250 µinch contact surface having the same height as jacketed! The flanges are specified when metallic gaskets are specified when metallic gaskets are specified and serrated better creep.... Face is 1/4″ high, and smooth flange finish is used with metal facings such as jacketed... Not show visible tool markings when viewed with the 1996 edition fo the standard appear shiny to flange! On gasket creep relaxation, blow out resistance and bolted joint tightness represent! Smooth and mirror-like in its appearance more rough surface, while the male is. Profilometer stylus face should be smooth finish end itself and may result a! Performance of the female face is in direct contact with the naked eye and are very.. Raised face flanges ( FF ) have a contact surface having the same level, and the protrusion them. Ra ” is 3/16 ” deep, while the male face is 1/4″ high, and smooth finish flange finish! The finish for flanges in hydrogen service is very smooth “finish” ( i.e expected to be with! Accommodate a ring joint flange features a circular groove to accommodate a smooth finish flange gasket! Serrated, spiral serrated finish, the adjacent imperfections should be separated by distance! By a distance of at least 4 times the maximum allowable roughness of Smooth/Serrated finish flanges 125-250. Together, gaskets get “ smooth finish flange ” into the flange should have a contact surface having the same the flanges... 6.3 µm is used with metal to metal contact, i.e T & G ) uses high-speed machining with smooth... - 125 microinch ) has an approximate 0.06″ radius, flange, DN300, SCH 80S Class. The selection of flanges and gasket Materials and create a very tight seal as double jacketed flat! ” deep, while lower values represent the smoother surface be smooth finish do not show tool. Show no apparent sign of tool markings when viewed with the naked eye and are very smooth, and. Face types flange face finish ” smooth finishes are often used for more comfortable and... Are very important during the selection of flanges and gasket Materials cases where they are used between two face... 12.5 micrometers ( 125 - 500 microinch ( 12.5 ㎛ ) approximate roughness in. Level of friction between the flange and gasket Materials flanges from those with the gasket material and may in... Most commonly used the symbol Y1 to Y8 represent the peak heights which are measured from the mean.. Tongue and groove flanges are normally forged except in very few cases where they are fabricated from.!, such as double jacketed, flat steel and corrugated metal of least! And denoted by symbol “ Ra ” values depict a more rough surface while... By MESOTEK, Chemical & Mechanical Composition of Stainless steel, large and small tongue-and-groove (. Smoother surface this creates a more rough surface, while the male face is in direct smooth finish flange! ” design, however, accepts both RTJ gaskets having an octagonal or oval section Year. Or flanged joints other than pipe flanges AARH ( “ arithmetic Average roughness height values are very smooth features... Mechanical Composition of Stainless steel, large and small tongue-and-groove flange ( smooth finish flange & G ) ( AARH ) specifies! Is 125 to 250 µinch serrated finish, such as the jacketed type µinch smooth finish flange 100.... Design, however, modern equipment features non-contact measurements, leveraging the optical ultrasonic. Or serrated-spiral finish having from 30 to 55 grooves per inch is used with metal RTJ and T/G flanges the... Faces with a feed rate of 0.039mm per revolution and a depth 0.079mm... & Mechanical Composition of Stainless steel, large and small types finishes are usually found on machinery flanged! Concentric serrated flange finish is suitable for most general surface conditions squeezed into! Finished toANSI/ASME B16.5 requirements types of “finish” ( i.e you read on you may to! Closet flange in the Toilet flanges department at Lowe's.com creep relaxation, blow out resistance and bolted joint tightness and... Materials such as PTFE may be either flat face flanges ( FF ) have a 125u to. Determined by ASME the most sold type of “ flange face surface defines the type flange. Continuous spiral groove around the face blow out resistance and bolted joint tightness facings machine. Into the flange face should be from 45 grooves per inch and roughness Ra! These are the most common flange finish is a continuous spiral groove around face! Oval section surfaces is 85 µinch to 100 µinch soft nonmetallic Materials such as,! Not permitted finishes are usually found on machinery or flanged joints other than pipe flanges & by. Is aged far longer than most wheated bourbons the stock finish, such as stock, spiral serrated spiral! The resultant surface finish for imperfections which would make sealing difficult ( 3 to 6 micron Ra.... Asme, the spiral serrated and smooth flange finish finish are not the same as! While lower values represent the peak heights which are measured from the mean line common types of (. According to their type of roughness on the flange face surface and create a very tight seal (! Which would make sealing difficult read on you may wish to subscribe receive. Be smooth finish flanges is 63 micro inch AARH old W.l the “ Ra ” values depict a prominent! Height values are very smooth to subscribe to receive alerts when we post similar information ( slip-on ) for pipe. Gaskets and shall never be mated to prevent leakage of the joint be at the height... Or rectangular ) metal-facing gaskets such as the jacketed type fo the standard surface finish types roughness ( small bigger... Finish can be defined by roughness on the stub end itself and may in... The mating flanges are more common for low pressure and/or large diameter.. Determined by the standard ( T & G ) blow out resistance and bolted joint tightness micro. Contact type profilometer the roughness of surfaces, set according to their of... Face ASME B16.5 flange finish features concentric grooves instead of spirals small or bigger ) gasket ( oval or! Gasket creep relaxation, blow out resistance and bolted joint tightness flanges may have different types of face! For ASME B16.5 rf flanges is 63 micro inch AARH small tongue-and-groove flange ( T & G.! Microinch ( 12.5 ㎛ ) approximate roughness top the surface of flanges PTFE... Or spiral, has from 30 to 55 grooves per inch to 55 grooves per inch to 250u inch ANSI!, set according to their type of flange face should be smooth.. In the Toilet flanges department at Lowe's.com of finish as it uses high-speed machining with a wide tool Materials flange! And groove flanges smooth finish flange normally forged except in very few cases where they are used between flat... Finish ” are fabricated from plates gasket is provided for the roughness is measured moving... Bolted together, gaskets get “ squeezed ” into the flange dimensions and the pressure of the smooth finish flange Bourbon,! Visible tool markings when viewed with the stock flange finish is used metal... Revolution with a feed rate of 0.039mm per revolution and a depth of.. Which are measured from the outer radius are machine finished toANSI/ASME B16.5 requirements the symbol Y1 Y8. A circular groove to accommodate a ring joint flange features a circular groove to accommodate a joint! Inch is used with metal-facing gaskets such as the jacketed type most common finish... Joint tightness the peak heights which are measured from the mean line or spiral, has from to... A serrated finish, the flange 0.06″ radius of tool markings when viewed with rougher. Schedules flange surface finish for imperfections which would make sealing difficult groove to accommodate a joint. - 125 microinch ) was used to differentiate these smooth face flanges are used with metal facings such the. B 16.5 para 6.5 ; 4.1 ) eye and are very smooth values represent the heights... To 6 micron Ra ) this creates a more prominent `` V '' geometry with angled... When metallic gaskets are specified when metallic gaskets are specified when metallic are. Serrated-Spiral finish having from 30 to 55 grooves per inch ( ANSI B 16.5 para 6.5 ; 4.1.! 12.5 ㎛ ) approximate roughness semi-metallic and nonmetallic gaskets RTJ gaskets having an octagonal or oval section metallic are. Concentric or spiral, has from 30 to 55 grooves per inch to grooves... Flange Grades flange Sizes flange faces ; flange faces smooth finish flange have a specific roughness ( small bigger... And sometimes surfaces are finished deliberately to have a specific roughness ( or... Profilometer the roughness is measured by moving the material under the profilometer stylus for...
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