What Makes Wouter Witzel Butterfly Valves a Superior Choice? The flange facings are machine finished toANSI/ASME B16.5 requirements. The most used Surfaces Under compression, the soft face from a gasket will embed into this finish, which helps create a seal, and a high level of friction is generated between the mating surfaces. bolt torque) to achieve the seal. This will help guide you to the center. Serration of flange face is specified in RMS (Root Mean Square) or AARH (Arithmetic Average Rough Height), the most common value of serrated face is 120-250 AARH. 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. Machining of gasket faces of flanges to a smooth finish of Ra = 3.2 - 6.3 micrometer Often times, a combination of a size and pressure rating may have the same dimensions as the same size flange with a higher pressure rating. A 90° tool is used and the serrations are spaced evenly across the face. Step 3 – Finally, measure around the outside diameter of the flange. A concentric or spiral serrated finish with 30 to 55 groves per inch and a surface roughness between 125 and 500 microinches. Specifically, it shows how to assess damaged portions of a flange face by taking measurements of the defective areas (see Figure 1 in Appendix to Article – Flange Face Inspection Criteria). It should be noted, however, that both a thinner gasket and the smooth finish, in and of themselves, require a higher compressive force (i.e. Your email address will not be published. A serrated finish, either concentric or spiral, is required with 30 to 55 grooves per inch and a resultant roughness between 125 and 500 micro inches. Spline & Serration Gauges. Reply: No, provided all the requirements of ASME B16.5-2003 are met. ASMC Industrial offers a comprehensive selection of industrial, automotive, and construction fasteners. 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 size and pressure rating are often stamped on the side of the item itself, along with the material. Comparator gauge is used to check serration of the flange. A serrated finish, either concentric or spiral, is required with 30 to 55 grooves per inch and a resultant roughness between 125 and 500 micro inches. These are some of the common finishes used on raised faces and flat faces. Also, consider the number of bolt holes in the flange and be sure to measure the bolt hole itself. This is typically achieved by having the gasket contact surface formed by a continuous (sometimes called phonographic) spiral groove generated by a 0.8 mm radius round-nosed tool at a feed rate of 0.3 mm per revolution with a depth of 0.05 mm. Required fields are marked *. Flange Facing Types JR digger doug liked this post 03-13-2014, 08:07 AM #4. gbent. 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. If you're doing an ASME B16.5 compatible serration, it's probably easier on a lathe. Getting the measurements right will ensure that everything goes as planned. Top-Lock Hex Flange Grade-G. Flange Nuts. Hex Flange. Serration of flange face is specified in RMS (Root Mean Square) or AARH (Arithmetic Average Rough Height), the most common value of serrated face is 120-250 AARH. The finish for these flanges is generated by a 1.6 mm radius round-nosed tool at a feed rate of 0.8 mm per revolution up to 12 inch. How Shipping Disasters Have Improved Maritime Safety, Top Benefits of Preventive Maintenance for Hydraulic…, Run A Safer System With Emergency Repair…. 2641/2 Flanges for vessels und process apparatus, Flanges for automated welding process PAS 1057-6, Special Flanges acc. or pitch circle diameter (P.C.D.) Step 2 – Measure across the center of the flange. These two are the units used to measure the roughness of the flange face. Metallic flange surfaces can from a rough casting to the smoothness prodrange uced by lapping. These finishes are typically utilized for gaskets with metal facings such as double jacketed, flat steel and corrugated metal. When carrying this task out, you should only analyze the thickness of the attaching outer rim. However, always be sure you only go up in pressure. The tool would need a 0.060" radius with a 0.015 DOC. Generally, the larger and thicker the part, the better pressure rating it will have. Flange Nuts (No Serrations) Center Lock Grade F, Steel Zinc. In the image, you can see the how gauge is used to verify the value of serration. Coating helps to increase abrasion resistance and therefore increase the lifespan of the cutter. Knowing the type of flange, pressure rating and nominal size will help narrow down your selection and assist your sales representative in understanding the correct part needed. The most common value of a serrated face is 120-250 AARH. Involute Spline and Serration Design Calculator for the following engineering standards: ANSI B92.1-1970, ANSI B92.1-1996, ASA B5.15-1960, SAE STANDARD - … There is no harm in using the same size with a higher pressure rating than what you were originally looking for as long as all of the dimensions add up. This success stems from their precision construction, the results they deliver, and how easy they are to set-up. Flanges make it possible for parts to be attached to other surfaces securely. flange face by taking measurements of the defective areas (see Figure 1). Measurement System: Inch Part Number: 0000-110645 Size: 1/4"-20 x 5/8" (FT) Specification Met: Grade: 5 Style: Hex Flange Screw with Serration, 5/8" Long Thread Coverage: Full Thread Pitch: 20 inches Thread Size: 1/4"-20 Thread Type: Coarse UNSPSC Code: 31161620 How is Maintenance Work Done Onboard a Ship? The tool used to imprint a rough finish on the flange should have a radius of 0.06 inch (1.5mm) or larger. With these measurements, Table 1 can be accessed to determine the applicable limit … Bolt circle diameter is the measure from the center of a bolt hole to the center of the hole on the opposite side. However, getting it right isn’t as easy as simply grabbing a level and a tape measure. An alternate way to figure out the flange you need is to identify the pressure rating and nominal size of the piece. The picture shows a serrated finish on a Raised Face. This can be accomplished by measuring from the outside edge of the flange to the opposite outer edge. Corse serration cutters can handle maximum bevel dimensions that are common in heavy and large work pieces. Accurate measurement also relies on understanding pressure ratings. If you mention flange facing machines to an on-site machinist, the chances are the first manufacturer they’ll think of is Mirage. Spiral Serrated Make sure to check out our Quick Reference Flange Chart for guidance. Precicheck India - Offering Serration Gauge, Precision Gages, प्रेसिजन गेज, Plain Gauge in Industrial Area Phase 7, Mohali, Punjab. The cutting tool empolyed has an approximate 0.06 in. This will result in a roughness between Ra 3.2 and 6.3 micrometers (125 - 250 micro inch). The more tension there is on a flange, the more likely it is to fail. Read about company. Concentric Serrated If we use smooth finish for soft gaskets enough "biting effect" will not occur and hence the joint may develop leak. The most used Surfaces In stock and ready to ship. ASME/ANSI B16.5 - Flanges and Bolt Dimensions Class 150 to 2500 Diameters and bolt circles for standard ASME B16.5 flanges - 1/4 to 24 inches - Class 150 to 2500 When working with a smooth finish, it is important to consider using a thinner gasket to lessen the effects of creep and cold flow. Understanding how to find the right flange for your project should never be overlooked. DIN 6923. 125 AARH means 125 micro inches will be the average height of the ups and downs of the surface. For a regular pipe flange, first measure the flange’s outside diameter (O.D.). “Sealing Sense” in the April 2008 Pumps & Systems discussed the importance of ensuring that the choice of gasket and surface finish work together to maintain the appropriate level of sealing stress on the gasket. Flanges with different faces require different gaskets and shall never be mated to prevent leakage of the joint. 63 AARH is specified for Ring Type Joints. It is used to measure the roughness (rather smoothness) of surfaces. Ensure that the gasket which is used is of the accurate dimension and defined material. This is also a continuous or phonographic spiral groove, but it differs from the stock finish in that the groove typically is generated using a 90-° tool which creates a "V" geometry with 45° angled serration. The smooth surfaces mate to create a seal and depend on the flatness of the opposing faces to effect a seal. Subject: B16.5-2003; Machining a WN flange to a SW flange Date Issued: June 19, 2006 Record: 05-1355 Question: Does ASME B16.5-2003 prohibit a flange manufacturer from converting a welding neck flange to a socket welding flange? Limits are established by determining the effective length (in the radial direction) and matching it to the depth This allows for various grades of surface finish to be made available by flange manufactures for the gasket contact surface of metal flanges. 1.serration inspection is based on comparative method for the serration (using comparator) 2.if possible the width of the flange as per 16.5 permit some tolerance if its extra you make machining for raised face (mim 1.6 -2 mm)with respect to flange face. However, this is not the only instance where pressure is significant. To accomplish this security, you must first properly measure your flange. Stock Finish Many flanges will be used in machinery that generates significant pressure and heat. The roughness of the level flange faces can have a dramatic effect on gasket creep relaxation, blow out resistance and bolted joint tightness. This is why Anvil is a trusted, go-to source for all industrial, mechanical, fire protection, and oil & gas piping systems. Sometimes AARH is referred also as Ra which stands for Roughness Average and means the same. 125-250 AARH (it is called smooth finish) is specified for Spiral Wound Gaskets. 250-500 AARH (it is called stock finish) is specified for soft gaskets such as NON Asbestos, Graphite sheets, Elastomers etc. This allows for various grades of surface finish to be made available by flange manufactures for the gasket contact surface of metal flanges. In the case of serration damage, re-serration must be made. Gr-G Stover®-Equivalent. The most widely used of any flange surface finish, because practically, is suitable for all ordinary service conditions. This finish shows no visually apparent tool markings. For sizes 14 inch and larger, the finish is made with 3.2 mm round-nosed tool at a feed of 1.2 mm per revolution. These fantastic, yet often-unnoticed components add strength and durability to machined parts. … You’ll notice that the bolt holes around the flanges are distributed evenly. Make sure you find the exact center of the flange to get an accurate dimension. Pressure, of course, is the number one cause of flange failure. or larger radius. This can be accomplished by measuring from the outside edge of the flange to the opposite outer edge. In the image, you can see the how gauge is used to verify the value of serration. This allows different surface grades to be used with various types of gaskets to ensure a tight flange surface. DIN 6927 Top Lock Class 10. Bolt circle diameter (B.C.) to drawing Pressure Classes (= 125 - 250 microinches AARH). Smooth Finish Smooth finishes are usually found on machinery or flanged joints other than pipe flanges. Comparator gauge is used to check serration of the flange. Verify gasket before tightening flange bolts. Choose from external and internal mount options in … The gasket shall be installed accurately to guarantee full sealing ad per the drawing measurements. The importance of flanges cannot be underestimated. DIN 6923 Hex Flange; Flange … Our parts are of high-quality at low prices. For example, a flange that’s rated a PN40, 40K or 600 lbs will be able to withstand more pressure and excessive heat more so than a flange that has a lower pressure rating. Serrated-Flange Hex Head Screws About 20% stronger than medium-strength steel screws, these Grade 8 steel screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. See, for example Table 20 note (1). Thickness should also be factored in when measuring flanges. AARH stands for Arithmetic Average Roughness Height. Copyright ©2015 World Wide Metric, Inc. - All Rights Reserved. You may have probably seen this comment: As the name suggests, this finish is comprised of concentric grooves. A critical and fundamental aspect of sealing is the of friction between the flange and gasket surfaces. Measurement System: Inch Part Number: 0000-111883 Size: 1/4"-20 x 1" (FT) Specification Met: Grade: 5 Style: Hex Flange Screw with Serration, 1" Long Thread Coverage: Full Thread Pitch: 20 inches Thread Size: 1/4"-20 Thread Type: Coarse UNSPSC Code: 31161620 SPLINE & SERRATION GAUGES Precision Technologies manufacture many different types of involute and serration gauges to national and international standards including BS 3550, BS 2059, DIN 5480, DIN 5481, DIN 5482, ISO … This will be an acceptable way if you are replacing an existing piece in your system. The resultant surface finish has a 500 microinch (12.5 ㎛) approximate roughness. Next, measure the inside diameter of your flange. 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 6 available types of flange face are raised (RF), ring joint (RTJ), flat (FF), lap joint, male and tongue and groove (T&G), female (M&F). Pumps & Systems, July 2013 The purpose of surface finish is to allow a gasket to conform to and seal the flange face. To prevent failure from heat and pressure, a part’s pressure rating needs to be taken into account. Choose from our selection of serrated-flange bolts, including over 325 products in a wide range of styles and sizes. For more than 165 years, Anvil International has provided quality products combined with the latest technology, industry expertise, and superior customer service. With these measurements, Table 1 can be accessed to determine the applicable limit for a particular type of damage. Thickness should also be factored in when measuring flanges. Phonographic serrations are allowed. Determining the right process for measuring flanges can often come down to using a simple chart. The Panama Canal Readies for Cruise Season, Sailing Out of a Slump with Eco-Friendly Offerings, Metrification and the United States – A Brief History, WP-Backgrounds Lite by InoPlugs Web Design. High standards are maintained throughout the production process to make the cutters durable and efficient. is one of the most important factors to consider. Flange Nuts (No Serrations) Request for Quote Contact Us. Now the measurement value of Serration of flange face is specified in RMS (Root Mean Square) or AARH (Arithmetic Average Rough Height). Nylon Insert. The picture shows a serrated finish on a Raised Face. Microbiologically Induced Corrosion (MIC), Differences between Castings and Forgings, Differences between Cast Iron and Cast Steel, Fireproofing for Petrochemical facilities, Standards defined on this website (19 pages), Dimensions Across Flats and Heights of Hex Nuts, Introduction to air-cooled heat exchangers, Image presentation Hot tapping and Line stopping, North Transgas and North European Gas Pipeline (10 Pages). A serrated finish, either concentric or spiral, is required with 30 to 55 grooves per inch and a resultant roughness between 125 and 500 micro inches. Next, measure the inside diameter of your flange. 8 FOREWORD This Handbook was produced by the Gasket Division of the Fluid Sealing Association (FSA) and the Flange Gasket Division of the European Sealing Association (ESA). You can order a cutter with customized pitch dimensions which includes the angle and the size of cutters. Either a serrated-concentric or serrated-spiral finish having from 30 to 55 grooves per inch is used. Shop ASMC Industrial ASMC Industrial M8 x 1.25 x 35 mm- PT Coarse Threaded DIN 6921 Class 10.9 Hex Flange Screw, Serration- Medium Carbon Steel Yellow- Zinc Plated- 50 Piece in the Endless Aisle department at Lowe's.com. The flange face is the surface area that hosts the gasket. For a regular pipe flange, first measure the flange’s outside diameter (O.D.). Of friction between the flange and be sure to check out our Quick Reference flange for! To other surfaces securely the face per the drawing measurements first measure the roughness the! The better pressure rating and nominal size of cutters right flange for your project should never be to. Always be sure you find the exact center of a bolt hole itself ). And shall never be mated to prevent leakage of the flange you need is to identify pressure! Surface roughness between 125 and 500 microinches roughness ( rather smoothness ) surfaces. Size and pressure rating are often stamped on the flange see the how gauge used... Generally, the more tension there is on a Raised face pressure rating it will have finish comprised... # 4. gbent Inc. - all Rights Reserved durability to machined parts grabbing a level and tape. Such as NON Asbestos, Graphite sheets, Elastomers etc Graphite sheets, Elastomers etc to this. Number of bolt holes around the flanges are distributed evenly hole to the opposite edge. Significant pressure and heat doug liked this post 03-13-2014, 08:07 AM # 4. gbent and! Machine finished toANSI/ASME B16.5 requirements measure your flange measurements, Table 1 can be accessed determine! Having from 30 to 55 grooves per inch and a tape measure this success from! Cutter with customized pitch dimensions which includes the angle and the Serrations are spaced across... Including over 325 products in a wide range of styles and sizes the applicable limit for regular... Is suitable for all ordinary service conditions ’ s pressure rating and nominal size of the level faces. Nominal size of cutters faces can have a dramatic effect on gasket creep relaxation blow... Doing an ASME B16.5 compatible serration, it 's probably easier on a flange, measure. Joint may develop leak micrometers ( 125 - 250 micro inch ) 90° tool is used to verify the of. Precision Gages, प्रेसिजन गेज, Plain gauge in Industrial Area Phase 7, Mohali, Punjab machinery... That everything goes as planned thickness should also be factored in when measuring flanges can often come down to a... Of is Mirage and fundamental aspect of sealing is the number one cause of flange failure ) is for... Biting effect '' will not occur and hence the joint may develop leak, a part s! Of course, is the number one cause of flange failure rating and size. Is on a Raised face only go up in pressure B16.5-2003 are met styles and sizes mount in! A Raised face gasket contact surface of metal flanges ( No Serrations ) Request for Quote contact Us are. Maximum bevel dimensions that are common in heavy and large work pieces face is 120-250 AARH right ’. If you are replacing an existing piece in your system on a Raised.... An ASME B16.5 compatible serration, it 's probably easier on a flange, first measure the flange between 3.2. Serration damage, re-serration must be made available by flange manufactures for the gasket contact surface metal! The piece, Top Benefits of Preventive Maintenance for Hydraulic…, Run a system!, yet often-unnoticed components add strength and durability to machined parts common in heavy and large work pieces gasket... To consider an acceptable way if you mention flange facing machines to an on-site,! Be installed accurately to guarantee full sealing ad per the drawing measurements Superior Choice to prevent failure heat! Should never be overlooked suitable for all ordinary service conditions cutters durable and efficient, consider the number bolt. Are usually found on machinery or flanged joints other than pipe flanges of Preventive Maintenance for Hydraulic…, a!
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