... Flange Surface Finish; Smooth Finished; Smooth Finished. Extra Smooth Finish Flanges are used with Metal RTJ and T/G Flanges. Below are the standard surface finish types as determined by ASME. 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 faces with a smooth finish should show no apparent sign of tool markings when viewed with the naked eye. Simply subscribe using the button below. Tongue and groove flanges are standardized in both large and small types. 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. 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. 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. 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. Cold Water - It has a mirror like finish. The stock finish is suitable for most general surface conditions. For shop-welding, refer Section 9.17.3.4.1. The symbol Y1 to Y8 represent the peak heights which are measured from the mean line. This finish is equivalent to a ground surface as it uses high-speed machining with a wide tool. In a bolted flange joint, the flange face is in direct contact with the gasket. A “flat groove” design, however, accepts both RTJ gaskets having an octagonal or oval section. A serrated finish, concentric or spiral, has from 30 to 55 grooves per inch and roughness between 125 to 250 µinch. SMOOTH FINISH OR FACE. 1. A critical and fundamental aspect of sealing is the level of friction between the flange and gasket surfaces. This flange finish is usually expected to be used with metal to metal contact, i.e. The term AARH (“arithmetic average roughness height”) refers to the flange face smoothness/roughness. The cutting tool empolyed has an approximate 0.06 in. 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. There are common types of flange face finish, such as stock, spiral serrated, concentric serrated, and smooth flange finish. The average arithmetic roughness height values are very important during the selection of flanges and gasket materials. Type of flange face serrations are Concentric and Spiral. Smooth finishes are usually found on machinery or flanged joints other than pipe flanges. SMOOTH FINISH OR FACE. White. 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. They are used with metal to metal contact. A. 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. Stock finish; Flange face finish. This creates a more prominent "V" geometry with 45° angled serration. The cold water finishes appear shiny to the naked eye and are very smooth. They are used with metal to metal seals (no gasket). Smooth Finish Flange faces with a smooth finish should show no apparent sign of tool markings when viewed with the naked eye. 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 roughness of the flange faces can have a dramatic effect on gasket creep relaxation, blow out resistance and bolted joint tightness. This type of flange finish is used with metal-facing gaskets such as the jacketed type. 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. Package Contents. Flat face and smooth finish are not the same. This flange finish is usually expected to be used with metal to metal contact, i.e. This will result in a finish with a roughness between Ra 3.2 and 12.5 micrometers (125 - 500 microinch). . Design & SEO By MESOTEK, Chemical & Mechanical Composition of Stainless Steel, Large and small tongue-and-groove flange (T&G). Check All Types of Flange Finish Types Related Topics in Page. The radial projection can be evaluated by subtracting the inner radius from the outer radius. Flange Grades; Flange Sizes. 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. This will result in a roughness between Ra 3.2 and 6.3 micrometers (125 - 250 microinch). The soft nonmetallic materials such as PTFE may be used for more comfortable facing and better creep resistance. The finish for flanges in hydrogen service is very smooth, typically between Ra 2 and 3.2 micrometers (79 - 125 microinch). The term RFSF was used to differentiate these smooth face flanges from those with the rougher standard finish. Raised face flanges are the most sold type of flange, at least for petrochemical applications. These finishes are often used for gaskets with metal facings such as double jacketed, flat steel and corrugated metal. 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. without a gasket. 125 – 250 microinches). 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). The most common flange finish for ASME B16.5 RF flanges is 125 to 250 micron Ra (3 to 6 micron Ra). above 700/800 C°). FLANGE FACE TYPES Hydrogen Service Finish The finish for flanges in hydrogen service is very smooth, typically between Ra 2 and 3.2 micrometers (79 - 125 microinch). Hydrogen Service Finish The finish for flanges in hydrogen service is very smooth, typically between Ra 2 and 3.2 micrometers (79 – 125 microinch). Allowable roughness of Smooth/Serrated Finish flanges is 125-250 micro inch AARH. Flange Grades Flange Sizes Flange Faces Flange Materials Flange Standards Flange Schedules Flange Surface Finish More. A ring joint flange features a circular groove to accommodate a ring joint gasket (oval, or rectangular). Before you read on you may wish to subscribe to receive alerts when we post similar information. 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). 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. View chapter Purchase book. The AARH value for these flange surfaces is 85 µinch to 100 µinch. When working with a smooth finish, it is important to consider using a thinner gasket to lessen the effects of … See section 6.4.5 for flange finish details. 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. This type of flange finish is used with … To make this happen, the material of the ring joint gasket has to be softer (more ductile) than the material of the flange. RTJ flanges can be sealed by RTJ gaskets of different styles (R, RX, BX) and profiles (example: octagonal/oval for the R style). Flange. A radial groove for example is virtually impossible to seal against. 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. More than several years ago, the standard finish on raised face flanges was around 500 microinch roughness. The cold water finishes appear shiny to the naked eye and very smooth. The tool used to imprint a rough finish on the flange should have a radius of 0.06 inch (1.5mm) or larger. ASTM A182 F316L AWWA Flange, DN300, SCH 80S, Class D. Tags. 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. 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. The flange face finish is determined by the standard used and measured as an Arithmetical Average Roughness Height (AARH). Copyright © 2015 randhirmetal.com | All rights reserved. An example would be ANSI B16.5 which specifies face finishes within a range 125AARH - 500AARH (3.2 Ra to 12.5 Ra). 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. To achieve this a feed rate of 0.039mm per revolution with a depth of 0.079mm is most commonly used. to 2.2 grooves/ mm.). As the mating flanges are bolted together, gaskets get “squeezed” into the flange face surface and create a very tight seal. Types flange face surface defines the type of flange finish features concentric grooves, the adjacent should! 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