The soft nonmetallic materials such as PTFE may be used for more comfortable facing and better creep resistance. 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). The stock finish is suitable for most general surface conditions. Flat face and smooth finish are not the same. Smooth unrestricted flow design. ... Replaces broken cast iron closet flanges. 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. Manufacturer Color/Finish. Smooth finish flanges are more common for low pressure and/or large diameter pipelines. The groove density on the flange face should be from 45 grooves per inch to 55 grooves per inch (1.8 grooves/ mm. Allowable roughness of Smooth/Serrated Finish flanges is 125-250 micro inch AARH. The resultant surface finish shall have a 125u inch to 250u inch (ANSI B 16.5 para 6.5;4.1). The symbol Y1 to Y8 represent the peak heights which are measured from the mean line. The most common flange finish for ASME B16.5 RF flanges is 125 to 250 micron Ra (3 to 6 micron Ra). 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 stock finish is the most widespread type of finish as it suits the large majority of applications. Below are the standard surface finish types as determined by ASME. 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). There are common types of flange face finish, such as stock, spiral serrated, concentric serrated, and smooth flange finish. 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 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 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 average arithmetic roughness height values are very important during the selection of flanges and gasket materials. The serrations shall be at the same level, and the protrusion above them is not permitted. Cold Water Finish The flange face appears as mirror like. 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. No gasket is used between the flanges. RTJ flanges can be sealed by RTJ gaskets of different styles (R, RX, BX) and profiles (example: octagonal/oval for the R style). These are the standards for semi-metallic and nonmetallic gaskets. To have concentric grooves, the tool has a feed rate of 0.039mm per revolution and a depth of 0.079mm. Place flanges on both ends of shower rod. A “flat groove” design, however, accepts both RTJ gaskets having an octagonal or oval section. The term AARH (“arithmetic average roughness height”) refers to the flange face smoothness/roughness. 2. Smooth finish; B. Check All Types of Flange Finish Types Related Topics in Page. 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. Spiral serrations are generally used type. . Shipping info for Park Manor Wine & Spirits. This type of flange finish is used with metal-facing gaskets such as the jacketed type. $ 199.99 W. L. Weller Bourbon 12 Year Straight Whiskey. View chapter Purchase book. Full face gaskets, generally of the soft type, are used between two flat face flanges. It can cause the adjacent serrations to lose hold of the gasket material and may result in wears and leakages. RF and FF flanges may have different types of “finish” (i.e. OVERVIEW. In contact type profilometer the roughness is measured by moving the material under the profilometer stylus. Based On Material Of Construction The flanges are normally forged except in very few cases where they are fabricated from plates. Cold Water - It has a mirror like finish. Tongue and groove flanges are standardized in both large and small types. Similarly to tongue and groove flanges, male and female flanges (M&F face type) match one to the other as well. 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). 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). To achieve this a feed rate of 0.039mm per revolution with a depth of 0.079mm is most commonly used. 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