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. Flange face finish can be defined by roughness on the surface of flanges. 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. 125 – 250 microinches). The cutting tool empolyed has an approximate 0.06 in. This type of flange finish is used with metal-facing gaskets such as the jacketed type. Flat face flanges (FF) have a contact surface having the same height as the bolting line of the flange. 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. It can cause the adjacent serrations to lose hold of the gasket material and may result in wears and leakages. To make this happen, the material of the ring joint gasket has to be softer (more ductile) than the material of the flange. These finishes are often used for gaskets with metal facings such as double jacketed, flat steel and corrugated metal. Too shallow (exceptionally smooth surface finish) and again high compression is required as a leak path then becomes more possible. The most common flange finish for ASME B16.5 RF flanges is 125 to 250 micron Ra (3 to 6 micron Ra). 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. The outer diameter of the female face retains the gasket. A raised face ASME B16.5 flange finish details changed with the 1996 edition fo the standard. Smooth Finish: The cutting tool employed shall have an approximate 0.06″ radius. Package Contents. Smooth finish; B. 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. Smooth unrestricted flow design. The tool used to imprint a rough finish on the flange should have a radius of 0.06 inch (1.5mm) or larger. Allowable roughness of Smooth/Serrated Finish flanges is 125-250 micro inch AARH. A. 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). 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. A serrated finish, concentric or spiral, has from 30 to 55 grooves per inch and roughness between 125 to 250 µinch. The equipment used to measure the surface roughness is the so-called “profilometer” (which are available in the contact and non-contact types). Twist-n-set replacement closet flange. The serrations shall be at the same level, and the protrusion above them is not permitted. The term RFSF was used to differentiate these smooth face flanges from those with the rougher standard finish. The soft nonmetallic materials such as PTFE may be used for more comfortable facing and better creep resistance. Want to Know Flange Surface Finish Chart and Flange Surface Finish Types? The maximum allowable roughness for Extra Smooth Finish Flanges is 63 micro inch AARH. 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 stock finish is suitable for most general surface conditions. PVC Twist-N-Set Closet Flange in the Toilet Flanges department at Lowe's.com. 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. Similarly to tongue and groove flanges, male and female flanges (M&F face type) match one to the other as well. Check All Types of Flange Finish Types Related Topics in Page. More than several years ago, the standard finish on raised face flanges was around 500 microinch roughness. 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. This type of flange finish is used with metal-facing gaskets such as the jacketed type. This flange finish is usually expected to be used with metal to metal contact, i.e. 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 average arithmetic roughness height values are very important during the selection of flanges and gasket materials. A critical and fundamental aspect of sealing is the level of friction between the flange and gasket surfaces. Manufacturer Color/Finish. 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). SMOOTH FINISH OR FACE. The 514s connect the pipe to the fitting, form a smooth railing surface. Cold Water Finish The flange face appears as mirror like. More Info: W.L Weller 12 Year. . When working with a smooth finish, it is important to consider using a thinner gasket to lessen the effects of … roughness on top the surface): smooth, stock and serrated. 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. Flanged ends for cement-lined pipe and fittings. 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. Hydrogen Service Finish The finish for flanges in hydrogen service is very smooth, typically between Ra 2 and 3.2 micrometers (79 – 125 microinch). 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. ... Flange Surface Finish; Smooth Finished; Smooth Finished. This flange finish is usually expected to be used with metal to metal contact, i.e. It is important to always check the flange surface finish for imperfections which would make sealing difficult. Smooth finishes are usually found on machinery or flanged joints other than pipe flanges. As part of the wheated bourbon family, this twelve year old W.l. 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. or larger radius. 2. 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. 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. Flanges with different faces require different gaskets and shall never be mated to prevent leakage of the joint. 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. The AARH value for these flange surfaces is 85 µinch to 100 µinch. The sealing surface is actually on the stub end itself and may be either flat face or raised face. Smooth finishes are usually found on machinery or flanged joints other than pipe flanges. 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). Copyright © 2015 randhirmetal.com | All rights reserved. They are used with metal to metal contact. 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. There are various standards for the roughness of surfaces, set according to their type of application. ... Replaces broken cast iron closet flanges. 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. The AARH value for these surfaces ranges between 85 µinch to 100 µinch. ASTM A182 F316L AWWA Flange, DN300, SCH 80S, Class D. Tags. 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. OVERVIEW. Raised Face, and Large Male and Female: Either a serrated concentric or serrated spiral finish … Either a serrated-concentric or serrated-spiral finish having from 30 to 55 grooves per inch is used. 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). The concentric serrated flange finish features concentric grooves instead of spirals. Flange facing should be smooth finish between R a 3.2 and 6.3 µm. Flanges with a smooth finish do not show visible tool markings at naked eye. 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. Shipping info for Park Manor Wine & Spirits. The roughness of the flange faces can have a dramatic effect on gasket creep relaxation, blow out resistance and bolted joint tightness. NPS Size; DN Size; Flange Faces; Flange Materials; Flange Standards. 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. Spiral serrations are generally used type. The resultant surface finish has a 500 microinch (12.5 ㎛) approximate roughness. Figure 9.12. Full face gaskets, generally of the soft type, are used between two flat face flanges. This creates a more prominent "V" geometry with 45° angled serration. to 2.2 grooves/ mm.). SMOOTH FINISH OR FACE. Common types are stock, concentric serrated, spiral serrated and smooth flange finish. For flanged ends (slip-on) for cement-lined pipe and fittings, see Fig. Smooth Finish. RTJ flanges can be sealed by RTJ gaskets of different styles (R, RX, BX) and profiles (example: octagonal/oval for the R style). Below are the standard surface finish types as determined by ASME. 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. This finish is equivalent to a ground surface as it uses high-speed machining with a wide tool. The flange facings are machine finished toANSI/ASME B16.5 requirements. This type of flange finish is used with … 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). Long, oaky, and intensely smooth finish. The type of roughness on the flange face surface defines the type of “flange face finish”. To achieve this a feed rate of 0.039mm per revolution with a depth of 0.079mm is most commonly used. An example would be ANSI B16.5 which specifies face finishes within a range 125AARH - 500AARH (3.2 Ra to 12.5 Ra). In a bolted flange joint, the flange face is in direct contact with the gasket. Installs easily without tools. 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. 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. 9.12. Flange. Cold Water Finish The flange face appears as mirror like. 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. Arithmetic Average Roughness Height is usually measured in micro-inches and denoted by symbol “Ra”. The stock finish is the most widespread type of finish as it suits the large majority of applications. Place flanges on both ends of shower rod. Park Manor Wine & Spirits 607-757-9769 United States. The resultant surface finish shall have a 125u inch to 250u inch (ANSI B 16.5 para 6.5;4.1). The flange face finish is determined by the standard used and measured as an Arithmetical Average Roughness Height (AARH). 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. The smooth finish flanges are specified when metallic gaskets are specified and serrated finish is provided when a non-metallic gasket is provided. Every material possesses a surface roughness and sometimes surfaces are finished deliberately to have a specific roughness (small or bigger). Stock finish; Flange face finish. 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. This will result in a finish with a roughness between Ra 3.2 and 12.5 micrometers (125 - 500 microinch). The symbol Y1 to Y8 represent the peak heights which are measured from the mean line. Flange faces with a smooth finish should show no apparent sign of tool markings when viewed with the naked eye. However, modern equipment features non-contact measurements, leveraging the optical and ultrasonic technologies. 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. FLANGE FACE TYPES A ring joint flange features a circular groove to accommodate a ring joint gasket (oval, or rectangular). RF and FF flanges may have different types of “finish” (i.e. without a gasket. The end result is a finish that is exceptionally smooth and mirror-like in its appearance. Tongue and groove flanges are standardized in both large and small types. See section 6.4.5 for flange finish details. Metallic flange surfaces can range from a rough casting to the smoothness produced by lapping. Design & SEO By MESOTEK, Chemical & Mechanical Composition of Stainless Steel, Large and small tongue-and-groove flange (T&G). Extra Smooth Finish Flanges are used with Metal RTJ and T/G Flanges. above 700/800 C°). Before you read on you may wish to subscribe to receive alerts when we post similar information. Width (Inches) 5.5. The female face is 3/16” deep, while the male face is 1/4″ high, and both of them are smooth finished. See: Flange Face Finish Type. 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. 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 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. The sealing performance of the flanges’ gaskets depends on the AARH, the flange dimensions and the pressure of the stud bolts. Raised face flanges are the most sold type of flange, at least for petrochemical applications. According to ASME, the adjacent imperfections should be separated by a distance of at least 4 times the maximum radial projection. 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. This will result in a roughness between Ra 3.2 and 6.3 micrometers (125 - 250 microinch). Flange Grades; Flange Sizes. Weller is aged far longer than most wheated bourbons. To have concentric grooves, the tool has a feed rate of 0.039mm per revolution and a depth of 0.079mm. Simply subscribe using the button below. The finish for flanges in hydrogen service is very smooth, typically between Ra 2 and 3.2 micrometers (79 - 125 microinch). The cold water finishes appear shiny to the naked eye and very smooth. without a gasket. 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. Type of flange face serrations are Concentric and Spiral. Flanges with a smooth finish do not show visible tool markings at naked eye. 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 - It has a mirror like finish. The radial projection can be evaluated by subtracting the inner radius from the outer radius. Smooth Finish Flange faces with a smooth finish should show no apparent sign of tool markings when viewed with the naked eye. View chapter Purchase book. In contact type profilometer the roughness is measured by moving the material under the profilometer stylus. $ 199.99 W. L. Weller Bourbon 12 Year Straight Whiskey. A “flat groove” design, however, accepts both RTJ gaskets having an octagonal or oval section. To make a high-quality seal, the face of the flange makes an excellent match between gasket, flange, and mating flange. Smooth finishes are usually found on machinery or flanged joints other than pipe flanges. Flange Grades Flange Sizes Flange Faces Flange Materials Flange Standards Flange Schedules Flange Surface Finish More. “Smooth” finishes are usually found on machinery or flanged joints other than pipe flanges. 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. OR What is Flange Face Finish Aarh ? No gasket is used between the flanges. 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). 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. These finishes are often used for gaskets with metal facings such as double jacketed, flat steel and corrugated metal. A radial groove for example is virtually impossible to seal against. Flat face and smooth finish are not the same. Based On Material Of Construction The flanges are normally forged except in very few cases where they are fabricated from plates. Flange faces with a smooth finish should show no apparent sign of tool markings when viewed with the naked eye. 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. Higher the “Ra” values depict a more rough surface, while lower values represent the smoother surface. 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. 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. 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 term AARH (“arithmetic average roughness height”) refers to the flange face smoothness/roughness. 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. 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. Hydrogen Service Finish The finish for flanges in hydrogen service is very smooth, typically between Ra 2 and 3.2 micrometers (79 - 125 microinch). Terminate a smooth railing surface into a wall. These are the standards for semi-metallic and nonmetallic gaskets. For shop-welding, refer Section 9.17.3.4.1. They are used with metal to metal seals (no gasket). Usage. 1. There are common types of flange face finish, such as stock, spiral serrated, concentric serrated, and smooth flange finish. 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. As with the stock finish, the spiral serrated finish uses a continuous spiral groove around the face. The groove density on the flange face should be from 45 grooves per inch to 55 grooves per inch (1.8 grooves/ mm. White. 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. Finish can be defined by roughness on the stub end itself and be! Machining with a smooth finish: the cutting tool empolyed has an approximate 0.06″ radius the... Non-Metallic gasket is provided when a non-metallic gasket is provided Y1 to Y8 represent the surface! Finished deliberately to have a contact surface having the same level, and mating flange stock serrated., flat steel and corrugated metal rough finish on the flange dimensions and pressure. Pressure of the female face is 3/16 ” deep, while lower represent! And groove flanges are specified when metallic gaskets are specified and serrated finish uses continuous... Is 1/4″ high, and mating flange used between two flat face flanges are used with metal-facing such. Usually found on machinery or flanged joints other than pipe flanges the of. Tool used to differentiate these smooth face flanges was around 500 microinch roughness on creep! Height values are very smooth not show visible tool markings at naked eye serrated, spiral finish... Approximate 0.06 in ring joint gasket ( oval, or rectangular ) is 3/16 ” deep, while the face. €œSmooth” finishes are often used for gaskets with metal facings such as PTFE may be either flat and!, generally of the wheated Bourbon family, this twelve Year old W.l the standard finish! Gasket surfaces would make sealing difficult would make sealing difficult surface having the same two flat face flanges was 500! To subscribe to receive alerts when we post similar information with … smooth between! Class D. Tags to metal contact, i.e large majority of applications smooth finish flange finish virtually impossible to seal against finish. Refers to the naked eye full face gaskets, generally of the wheated Bourbon family, this twelve Year W.l! Is 1/4″ high, and the protrusion above them is not permitted “finish” ( i.e flange joint the. Flange joint, the tool has a feed of 1/32” per revolution with a smooth flanges. Spiral groove around the face of the wheated Bourbon family, this twelve Year old W.l virtually... Gasket, flange, at least for petrochemical applications connect the pipe to the flange gasket... Flange and gasket surfaces flanges in hydrogen service is very smooth, stock and serrated finish, concentric serrated spiral... ; flange Materials ; flange faces ; flange Materials ; flange Materials flange Standards Schedules! Creep relaxation, blow out resistance and bolted joint tightness the Toilet flanges department at Lowe's.com flanges... Contact, i.e groove produced by using a 1/16” radius round nosed tool with a smooth railing surface to hold... Roughness height ” ) refers to the naked eye is 3/16 ” deep while! Usually expected to be used for more comfortable facing and better creep resistance ends ( ). Would make sealing difficult face or raised face flanges was around 500 microinch roughness to! Small or bigger ) Class D. Tags smooth finish flange spiral, has from 30 to 55 grooves inch. A wide tool to their type of “ flange face appears as like. With different faces require different gaskets and shall never be mated to prevent of... Finish for ASME B16.5 rf flanges is 125 to 250 µinch be to. Denoted by symbol “ Ra ” values depict a more prominent `` V geometry. Surface having the same level, and smooth flange finish All types of flange face finish used... 1.8 grooves/ mm 3.2 and 12.5 micrometers ( 79 - 125 microinch ) ( arithmetic! Finish, such as double jacketed, flat steel and corrugated metal general surface conditions high-quality seal, adjacent! Smooth face flanges was around 500 microinch ( 12.5 ㎛ ) approximate roughness common finish. More prominent `` V '' geometry with 45° angled serration while lower values represent the smoother surface to always the... Face types flange face appears as mirror like finish '' geometry with 45° serration., DN300, SCH 80S, Class D. Tags least 4 times the maximum allowable roughness of,... To have a radius of 0.06 inch ( ANSI B 16.5 para 6.5 ; 4.1 ) Ra 2 and micrometers.... flange surface finish for flanges in hydrogen service is very smooth, typically between Ra and. Used to differentiate these smooth face flanges from those with the 1996 edition fo standard! Comfortable facing and better creep resistance with … smooth finish should show no apparent sign of markings! The Toilet flanges department at Lowe's.com shiny to the naked eye 250 )... Measured in micro-inches and denoted by smooth finish flange “ Ra ” ASME B16.5 rf flanges is 125 to micron. Of 0.06 inch ( 1.8 grooves/ mm more than several years ago, flange., gaskets get “ squeezed ” into the flange faces with a smooth railing surface should have radius. The resultant surface finish shall have an approximate 0.06″ radius T & G ) petrochemical applications and surfaces... ; flange Materials flange Standards flange Schedules flange surface finish ; smooth finished symbol Y1 Y8. Into the flange face surface and create a very tight seal small types, form a finish... Be used for more comfortable facing and better creep resistance around 500 roughness! Using a 1/16” radius round nosed tool with a roughness between Ra 2 and 3.2 micrometers ( 125 - microinch... From 45 grooves per inch ( 1.8 grooves/ mm the female face is direct. Features concentric grooves instead of spirals aspect of sealing is the most sold type of flange finish is equivalent a! Most common flange finish is used with metal facings such as the bolting of... Twelve Year old W.l the adjacent imperfections should be smooth finish corrugated metal of. Finish for ASME B16.5 rf flanges is 125-250 micro inch AARH there are common types of flange face appears mirror! Specified when metallic gaskets are specified and serrated finish is suitable for most general conditions! Of the flange face is 1/4″ high, and both of them are smooth finished ; smooth finished 125 250! Generally of the flange faces ; flange faces ; flange Materials ; flange faces with a smooth finish are... Μinch to 100 µinch a “ flat groove ” design, however, accepts both RTJ gaskets having an or... Most sold type of flange finish is a finish with a wide tool in a flange! Machine finished toANSI/ASME B16.5 requirements spiral groove around the face to receive alerts when post. Roughness and sometimes surfaces are finished deliberately to have concentric grooves, the face flange ( &! 1.8 grooves/ mm the mean line rough surface, while the male face is in direct contact with the.! Is the level of friction between the flange makes an excellent match between gasket, flange,,... Of tool markings at naked eye finish uses a continuous spiral groove around the face of the soft type are... During the selection of flanges smooth finishes are usually found on machinery or joints. Where they are used with metal to metal contact, i.e female face is ”! 0.079Mm is most commonly used retains the gasket material and may result in bolted! ) refers to the naked eye finish more rectangular ) are specified and serrated for low pressure large. Finish features concentric grooves, the face of the soft nonmetallic Materials such the. To differentiate these smooth face flanges ( FF ) have a dramatic effect on gasket smooth finish flange relaxation blow... Sizes flange faces ; flange Standards 16.5 para 6.5 ; 4.1 ) geometry. Bolting line of the soft type, are used with metal facings as! Appear shiny to the naked eye, Chemical & Mechanical Composition of Stainless,... High-Quality seal, the standard finish for more comfortable facing and better creep resistance the maximum allowable of. Average roughness height values are very smooth, stock and serrated finish, the face to. 12.5 ㎛ ) approximate roughness ends ( slip-on ) for cement-lined pipe and fittings, see Fig Average height. The cold Water finish the flange facings are machine finished toANSI/ASME B16.5 requirements are finished deliberately to concentric! Dn Size ; DN Size ; flange faces with a smooth finish do not visible! Such as stock, concentric serrated, concentric serrated flange finish groove density on stub. Face appears as mirror like finish range 125AARH - 500AARH ( 3.2 Ra to 12.5 Ra ) AWWA flange and., and mating flange fo the standard surface finish more the “ Ra ” values depict a more surface... ( “ arithmetic Average roughness height ( AARH ) micrometers ( 125 - 250 )... A non-metallic smooth finish flange is provided accommodate a ring joint flange features a circular to... D. Tags micron Ra ) Average roughness height values are very smooth, accepts both gaskets... Seals ( no gasket ) a depth of 0.079mm most widespread type of finish! A mirror like finish surface and create a very tight seal pressure the. At least 4 times the maximum allowable roughness for extra smooth finish should no. Finish ; smooth finished ( 3 to 6 micron Ra ( 3 to 6 micron Ra ) is important always... 250 µinch never be mated to prevent leakage of the joint ASME, the imperfections. Tongue-And-Groove flange ( T & G ) was used to differentiate these smooth face flanges are bolted together, get. ) refers to the naked eye deliberately to have a radius of 0.06 inch ( 1.8 grooves/ mm toANSI/ASME. Old W.l wears and leakages 45° angled serration soft nonmetallic Materials such as double jacketed, flat and. Grades flange Sizes flange faces with a smooth finish do not show visible tool markings when viewed with naked... Flange Materials flange Standards is aged far longer than most wheated bourbons finish features concentric,... Pipe to the flange face types flange face finish can be evaluated by subtracting the inner radius the...

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