More Info: W.L Weller 12 Year. Arithmetic Average Roughness Height is usually measured in micro-inches and denoted by symbol “Ra”. The concentric serrated flange finish features concentric grooves instead of spirals. 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. Similarly to tongue and groove flanges, male and female flanges (M&F face type) match one to the other as well. 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. Width (Inches) 5.5. Flat face and smooth finish are not the same. 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. See section 6.4.5 for flange finish details. 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. This type of flange finish is used with metal-facing gaskets such as the jacketed type. 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 514s connect the pipe to the fitting, form a smooth railing surface. Flange face finish can be defined by roughness on the surface of 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. 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. 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. These finishes are often used for gaskets with metal facings such as double jacketed, flat steel and corrugated metal. FLANGE FACE TYPES Smooth Finish Flange faces with a smooth finish should show no apparent sign of tool markings when viewed with the naked eye. Flange. The finish for flanges in hydrogen service is very smooth, typically between Ra 2 and 3.2 micrometers (79 - 125 microinch). 2. When working with a smooth finish, it is important to consider using a thinner gasket to lessen the effects of … They are used with metal to metal contact. 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. To make this happen, the material of the ring joint gasket has to be softer (more ductile) than the material of the flange. Package Contents. 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. ... Replaces broken cast iron closet flanges. 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). Smooth Finish: The cutting tool employed shall have an approximate 0.06″ radius. 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 soft nonmetallic materials such as PTFE may be used for more comfortable facing and better creep resistance. The AARH value for these flange surfaces is 85 µinch to 100 µinch. Flanges with a smooth finish do not show visible tool markings at naked eye. 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. These finishes are often used for gaskets with metal facings such as double jacketed, flat steel and corrugated metal. 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 the mating flanges are bolted together, gaskets get “squeezed” into the flange face surface and create a very tight seal. For flanged ends (slip-on) for cement-lined pipe and fittings, see Fig. View chapter Purchase book. See: Flange Face Finish Type. Usage. 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. This type of flange finish is used with … A ring joint flange features a circular groove to accommodate a ring joint gasket (oval, or rectangular). 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. Smooth finishes are usually found on machinery or flanged joints other than pipe flanges. The sealing surface is actually on the stub end itself and may be either flat face or raised face. 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. 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. Cold Water - It has a mirror like finish. Raised Face, and Large Male and Female: Either a serrated concentric or serrated spiral finish … These finishes are often used for gaskets with metal facings such as double jacketed, flat steel and corrugated metal. As part of the wheated bourbon family, this twelve year old W.l. More than several years ago, the standard finish on raised face flanges was around 500 microinch roughness. 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). The serrations shall be at the same level, and the protrusion above them is not permitted. Flange Grades; Flange Sizes. Place flanges on both ends of shower rod. The stock finish is suitable for most general surface conditions. 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 radial groove for example is virtually impossible to seal against. Want to Know Flange Surface Finish Chart and Flange Surface Finish Types? The end result is a finish that is exceptionally smooth and mirror-like in its appearance. The AARH value for these surfaces ranges between 85 µinch to 100 µinch. The radial projection can be evaluated by subtracting the inner radius from the outer radius. The stock finish is the most widespread type of finish as it suits the large majority of applications. Flanges with a smooth finish do not show visible tool markings at naked eye. It is important to always check the flange surface finish for imperfections which would make sealing difficult. 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 cold water finishes appear shiny to the naked eye and are very smooth. The sealing performance of the flanges’ gaskets depends on the AARH, the flange dimensions and the pressure of the stud bolts. This creates a more prominent "V" geometry with 45° angled serration. 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. An example would be ANSI B16.5 which specifies face finishes within a range 125AARH - 500AARH (3.2 Ra to 12.5 Ra). ... Flange Surface Finish; Smooth Finished; Smooth Finished. It can cause the adjacent serrations to lose hold of the gasket material and may result in wears and leakages. 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. Manufacturer Color/Finish. The outer diameter of the female face retains the gasket. 1. Type of flange face serrations are Concentric and Spiral. In a bolted flange joint, the flange face is in direct contact with the gasket. To achieve this a feed rate of 0.039mm per revolution with a depth of 0.079mm is most commonly used. 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). Flanges with different faces require different gaskets and shall never be mated to prevent leakage of the joint. 125 – 250 microinches). To have concentric grooves, the tool has a feed rate of 0.039mm per revolution and a depth of 0.079mm. This type of flange finish is used with metal-facing gaskets such as the jacketed type. Installs easily without tools. Raised face flanges are the most sold type of flange, at least for petrochemical applications. As with the stock finish, the spiral serrated finish uses a continuous spiral groove around the face. Smooth finishes are usually found on machinery or flanged joints other than pipe flanges. Weller is aged far longer than most wheated bourbons. OVERVIEW. The type of roughness on the flange face surface defines the type of “flange face finish”. 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. Flange facing should be smooth finish between R a 3.2 and 6.3 µm. There are common types of flange face finish, such as stock, spiral serrated, concentric serrated, and smooth flange finish. 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. The tool used to imprint a rough finish on the flange should have a radius of 0.06 inch (1.5mm) or larger. The flange facings are machine finished toANSI/ASME B16.5 requirements. Full face gaskets, generally of the soft type, are used between two flat face flanges. Flanges with a smooth finish do not show visible tool markings at naked eye. Copyright © 2015 randhirmetal.com | All rights reserved. Check All Types of Flange Finish Types Related Topics in Page. Park Manor Wine & Spirits 607-757-9769 United States. ASTM A182 F316L AWWA Flange, DN300, SCH 80S, Class D. Tags. 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). 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 faces with a smooth finish should show no apparent sign of tool markings when viewed with the naked eye. 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. Higher the “Ra” values depict a more rough surface, while lower values represent the smoother surface. Simply subscribe using the button below. The cutting tool empolyed has an approximate 0.06 in. 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. PVC Twist-N-Set Closet Flange in the Toilet Flanges department at Lowe's.com. without a gasket. 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. 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 OR FACE. The average arithmetic roughness height values are very important during the selection of flanges and gasket materials. The term AARH (“arithmetic average roughness height”) refers to the flange face smoothness/roughness. Smooth finish; B. Either a serrated-concentric or serrated-spiral finish having from 30 to 55 grooves per inch is used. Smooth finish flanges are more common for low pressure and/or large diameter pipelines. To make a high-quality seal, the face of the flange makes an excellent match between gasket, flange, and mating flange. A critical and fundamental aspect of sealing is the level of friction between the flange and gasket surfaces. Metallic flange surfaces can range from a rough casting to the smoothness produced by lapping. 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. roughness on top the surface): smooth, stock and serrated. 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). 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. A. 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. 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. RF and FF flanges may have different types of “finish” (i.e. This flange finish is usually expected to be used with metal to metal contact, i.e. According to ASME, the adjacent imperfections should be separated by a distance of at least 4 times the maximum radial projection. This finish is equivalent to a ground surface as it uses high-speed machining with a wide tool. . 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