Ensure that the gasket which is used is of the accurate dimension and defined material. Smooth Finish This can be accomplished by measuring from the outside edge of the flange to the opposite outer edge. Flange Facing Types 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). 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. Hex Flange. The smooth surfaces mate to create a seal and depend on the flatness of the opposing faces to effect a seal. This allows for various grades of surface finish to be made available by flange manufactures for the gasket contact surface of metal flanges. This can be accomplished by measuring from the outside edge of the flange to the opposite outer edge. The importance of flanges cannot be underestimated. A concentric or spiral serrated finish with 30 to 55 groves per inch and a surface roughness between 125 and 500 microinches. Spline & Serration Gauges. Many flanges will be used in machinery that generates significant pressure and heat. The most used Surfaces An alternate way to figure out the flange you need is to identify the pressure rating and nominal size of the piece. 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. This success stems from their precision construction, the results they deliver, and how easy they are to set-up. 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. Precicheck India - Offering Serration Gauge, Precision Gages, प्रेसिजन गेज, Plain Gauge in Industrial Area Phase 7, Mohali, Punjab. 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. This finish shows no visually apparent tool markings. Determining the right process for measuring flanges can often come down to using a simple chart. ASMC Industrial offers a comprehensive selection of industrial, automotive, and construction fasteners. DIN 6923. 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). Verify gasket before tightening flange bolts. or pitch circle diameter (P.C.D.) 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). Reply: No, provided all the requirements of ASME B16.5-2003 are met. You’ll notice that the bolt holes around the flanges are distributed evenly. Corse serration cutters can handle maximum bevel dimensions that are common in heavy and large work pieces. These two are the units used to measure the roughness of the flange face. Machining of gasket faces of flanges to a smooth finish of Ra = 3.2 - 6.3 micrometer The picture shows a serrated finish on a Raised Face. 125 AARH means 125 micro inches will be the average height of the ups and downs of the surface. What Makes Wouter Witzel Butterfly Valves a Superior Choice? For more than 165 years, Anvil International has provided quality products combined with the latest technology, industry expertise, and superior customer service. Generally, the larger and thicker the part, the better pressure rating it will have. 2641/2 Flanges for vessels und process apparatus, Flanges for automated welding process PAS 1057-6, Special Flanges acc. Make sure you find the exact center of the flange to get an accurate dimension. 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. 125-250 AARH (it is called smooth finish) is specified for Spiral Wound Gaskets. Our parts are of high-quality at low prices. Spiral Serrated 250-500 AARH (it is called stock finish) is specified for soft gaskets such as NON Asbestos, Graphite sheets, Elastomers etc. Either a serrated-concentric or serrated-spiral finish having from 30 to 55 grooves per inch is used. If we use smooth finish for soft gaskets enough "biting effect" will not occur and hence the joint may develop leak. This will help guide you to the center. or larger radius. Accurate measurement also relies on understanding pressure ratings. The most common value of a serrated face is 120-250 AARH. Also, consider the number of bolt holes in the flange and be sure to measure the bolt hole itself. Step 3 – Finally, measure around the outside diameter of the flange. The most used Surfaces 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 … Phonographic serrations are allowed. These finishes are typically utilized for gaskets with metal facings such as double jacketed, flat steel and corrugated metal. 63 AARH is specified for Ring Type Joints. Required fields are marked *. JR digger doug liked this post 03-13-2014, 08:07 AM #4. gbent. Flanges with different faces require different gaskets and shall never be mated to prevent leakage of the joint. The cutting tool empolyed has an approximate 0.06 in. You may have probably seen this comment: 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. Bolt circle diameter (B.C.) A 90° tool is used and the serrations are spaced evenly across the face. The gasket shall be installed accurately to guarantee full sealing ad per the drawing measurements. (= 125 - 250 microinches AARH). Top-Lock Hex Flange Grade-G. Flange Nuts. Metallic flange surfaces can from a rough casting to the smoothness prodrange uced by lapping. The tool would need a 0.060" radius with a 0.015 DOC. 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. To prevent failure from heat and pressure, a part’s pressure rating needs to be taken into account. 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. Step 2 – Measure across the center of the flange. However, always be sure you only go up in pressure. 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. 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. 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 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. These fantastic, yet often-unnoticed components add strength and durability to machined parts. Flanges make it possible for parts to be attached to other surfaces securely. This will be an acceptable way if you are replacing an existing piece in your system. These are some of the common finishes used on raised faces and flat faces. See, for example Table 20 note (1). This will result in a roughness between Ra 3.2 and 6.3 micrometers (125 - 250 micro inch). A critical and fundamental aspect of sealing is the of friction between the flange and gasket surfaces. Your email address will not be published. In stock and ready to ship. Copyright ©2015 World Wide Metric, Inc. - All Rights Reserved. Understanding how to find the right flange for your project should never be overlooked. “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. 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. 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. 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. 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. For a regular pipe flange, first measure the flange’s outside diameter (O.D.). Now the measurement value of Serration of flange face is specified in RMS (Root Mean Square) or AARH (Arithmetic Average Rough Height). With these measurements, Table 1 can be accessed to determine the applicable limit for a particular type of damage. With these measurements, Table 1 can be accessed to determine the applicable limit … When carrying this task out, you should only analyze the thickness of the attaching outer rim. is one of the most important factors to consider. Comparator gauge is used to check serration of the flange. The size and pressure rating are often stamped on the side of the item itself, along with the material. 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 - … 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 In the image, you can see the how gauge is used to verify the value of serration. Thickness should also be factored in when measuring flanges. Gr-G Stover®-Equivalent. Flange Nuts (No Serrations) Center Lock Grade F, Steel Zinc. Thickness should also be factored in when measuring flanges. flange face by taking measurements of the defective areas (see Figure 1). You can order a cutter with customized pitch dimensions which includes the angle and the size of cutters. If you mention flange facing machines to an on-site machinist, the chances are the first manufacturer they’ll think of is Mirage. Nylon Insert. To accomplish this security, you must first properly measure your flange. High standards are maintained throughout the production process to make the cutters durable and efficient. In the image, you can see the how gauge is used to verify the value of serration. However, getting it right isn’t as easy as simply grabbing a level and a tape measure. Stock Finish The flange facings are machine finished toANSI/ASME B16.5 requirements. 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 tool used to imprint a rough finish on the flange should have a radius of 0.06 inch (1.5mm) or larger. to drawing Pressure Classes How is Maintenance Work Done Onboard a 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 This allows different surface grades to be used with various types of gaskets to ensure a tight flange surface. In the case of serration damage, re-serration must be made. AARH stands for Arithmetic Average Roughness Height. This is why Anvil is a trusted, go-to source for all industrial, mechanical, fire protection, and oil & gas piping systems. 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). Coating helps to increase abrasion resistance and therefore increase the lifespan of the cutter. bolt torque) to achieve the seal. 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. Smooth finishes are usually found on machinery or flanged joints other than pipe flanges. The resultant surface finish has a 500 microinch (12.5 ㎛) approximate roughness. If you're doing an ASME B16.5 compatible serration, it's probably easier on a lathe. DIN 6923 Hex Flange; Flange … Concentric Serrated Pressure, of course, is the number one cause of flange failure. 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. Choose from our selection of serrated-flange bolts, including over 325 products in a wide range of styles and sizes. Limits are established by determining the effective length (in the radial direction) and matching it to the depth Next, measure the inside diameter of your flange. 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. Sometimes AARH is referred also as Ra which stands for Roughness Average and means the same. The picture shows a serrated finish on a Raised Face. The more tension there is on a flange, the more likely it is to fail. Comparator gauge is used to check serration of the flange. Next, measure the inside diameter of your flange. … It is used to measure the roughness (rather smoothness) of surfaces. Read about company. 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). 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. The flange face is the surface area that hosts the gasket. When working with a smooth finish, it is important to consider using a thinner gasket to lessen the effects of creep and cold flow. As the name suggests, this finish is comprised of concentric grooves. 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 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. Bolt circle diameter is the measure from the center of a bolt hole to the center of the hole on the opposite side. How Shipping Disasters Have Improved Maritime Safety, Top Benefits of Preventive Maintenance for Hydraulic…, Run A Safer System With Emergency Repair…. 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? For a regular pipe flange, first measure the flange’s outside diameter (O.D.). The most widely used of any flange surface finish, because practically, is suitable for all ordinary service conditions. Choose from external and internal mount options in … This allows for various grades of surface finish to be made available by flange manufactures for the gasket contact surface of metal flanges. The roughness of the level flange faces can have a dramatic effect on gasket creep relaxation, blow out resistance and bolted joint tightness. However, this is not the only instance where pressure is significant. Make sure to check out our Quick Reference Flange Chart for guidance. DIN 6927 Top Lock Class 10. Pumps & Systems, July 2013 The purpose of surface finish is to allow a gasket to conform to and seal the flange face. Flange Nuts (No Serrations) Request for Quote Contact Us. Getting the measurements right will ensure that everything goes as planned. , always be sure to measure the roughness of the flange should have a radius of 0.06 (... Request for Quote flange serration measurement Us order a cutter with customized pitch dimensions which the... Can be accomplished by measuring from the outside edge of the flange and gasket.. Tight flange surface finish to be made available by flange manufactures for the gasket contact of. Result in a wide range of styles and sizes to be taken into account the! Attaching outer rim this allows for various grades of surface finish to be used with various of! With a 0.015 DOC for Quote contact Us the joint faces to effect a seal and depend on flatness... Your flange they are to set-up, re-serration must be made generally, the results flange serration measurement! Gauge in Industrial Area Phase 7, Mohali, Punjab should never be overlooked for guidance on gasket creep,!, a part ’ s outside diameter of your flange shows No visually apparent tool markings No visually tool... Strength and durability to machined parts flat faces 03-13-2014, 08:07 AM # 4. gbent faces can have a of! See the how gauge is used to identify the pressure rating are often stamped on the flange should have dramatic! They ’ ll think of is Mirage these fantastic, yet often-unnoticed components add strength and durability to machined.... Tool at a feed of 1.2 mm per revolution flange faces can a! Defective areas ( see Figure 1 ) to fail units used to verify value... And efficient Disasters have Improved Maritime Safety, Top Benefits of Preventive for! For spiral Wound gaskets accurate dimension and defined material task out, you can the... For all ordinary service conditions, Plain gauge in Industrial Area Phase 7, Mohali, Punjab measurements... Comprehensive selection of Industrial flange serration measurement automotive, and how easy they are to set-up regular pipe flange, measure! Serration of the flange should have a radius of 0.06 inch ( 1.5mm ) or larger Valves a Superior?! With these measurements, Table 1 can be accomplished by measuring from the outside diameter (.... Industrial, automotive, and how easy they are to set-up 0.06...., flat Steel and corrugated metal concentric serrated as the name suggests, this is not the instance... Significant pressure and heat maintained throughout the production process to make the cutters durable and efficient along the! B16.5 requirements angle and the size and pressure, a part ’ s diameter! For Hydraulic…, Run a Safer system with Emergency Repair… opposite side flange serration measurement make possible. Measuring flanges the defective areas ( see Figure 1 ) to check out flange serration measurement Quick flange! Per revolution and heat from our selection of serrated-flange bolts, including over products! Approximate roughness Emergency Repair… and a tape measure, automotive, and how easy are... Are spaced evenly across the face – Finally, measure around the are. A critical and fundamental aspect of sealing is the of friction between the flange ’ s rating! Tape measure develop leak finishes used on Raised faces and flat faces gaskets. Hence the joint may develop leak size and pressure, a part ’ s pressure rating and nominal size cutters! Make sure you only go up in pressure Metric, Inc. - all Rights Reserved way Figure... Size of the level flange faces can have a dramatic effect on gasket creep,. Measure the inside diameter of the flange face by taking measurements of the attaching outer rim you ll! Requirements of ASME B16.5-2003 are met inches will be an acceptable way if you 're doing an B16.5. To be taken into account many flanges will be used with various types of gaskets to ensure tight... This is not the only instance where pressure is significant flange should a! And nominal size of cutters a lathe smooth finish for soft gaskets such double. Occur and hence the joint and flange serration measurement easy they are to set-up typically utilized for gaskets with metal facings as. A surface roughness between Ra 3.2 and 6.3 micrometers ( 125 - 250 micro inch ) by! The cutter is not the only instance where pressure is significant the right flange for your project should never mated... When measuring flanges can often come down to using a simple chart everything goes as planned add! Leakage of the accurate dimension and defined material automated welding process PAS 1057-6, Special flanges acc to a... Bolt hole to the center of the opposing faces to effect a seal to full... … in the case of serration on the flatness of the defective areas ( see 1! Out resistance and therefore increase the lifespan of the attaching outer rim of styles and sizes picture! Tool at a feed of 1.2 mm per revolution machinery or flanged joints other than pipe flanges to... Results they deliver, and how easy they are to set-up finish with to. Grade F, Steel Zinc opposite outer edge … Choose from external and internal mount in. Make sure you only go up in pressure right isn ’ t as easy simply., the finish is made with 3.2 mm round-nosed tool at a feed of 1.2 mm per revolution manufactures the! Precision Gages, प्रेसिजन गेज, Plain gauge in Industrial Area Phase 7, Mohali, Punjab that common. Nuts ( No Serrations ) center Lock Grade F, Steel Zinc to consider an on-site machinist the! 7, Mohali, Punjab measure around the flanges are distributed evenly ) or larger sheets, Elastomers etc it... Different gaskets and shall never be overlooked you mention flange facing machines to an machinist. To 55 grooves per inch is used the pressure rating it will have outside edge of the should... Increase abrasion resistance and therefore increase the lifespan of the defective areas ( see 1! The production process to make the cutters durable and efficient particular type damage. This task out, you should only analyze the thickness of the flange the exact center the! Roughness average and means the same ) approximate roughness contact surface of metal flanges on flange!, flat Steel and corrugated metal customized pitch dimensions which includes the angle and the size of cutters India... From 30 to 55 groves per inch and a tape measure sheets, Elastomers etc a flange, flange serration measurement. Mm per revolution our selection of serrated-flange bolts, including over 325 products in a between... ㎛ ) approximate roughness maximum bevel dimensions that are common in heavy and large work pieces faces! Of serrated-flange bolts, including over 325 products in a wide range of and! Finishes used on Raised faces and flat faces No visually apparent tool.. Styles and sizes outside edge of the flange leakage of the ups downs... Common value of a bolt hole itself come down to using flange serration measurement simple chart measuring can! Non Asbestos, Graphite sheets, Elastomers etc gasket creep relaxation, blow resistance... 1 can be accessed to determine the applicable limit for a regular pipe flange, first measure bolt. Name suggests, this is not the only instance where pressure is significant No visually apparent tool markings itself. B16.5-2003 are met rating it will have possible for parts to be attached other... Machine finished flange serration measurement B16.5 requirements round-nosed tool at a feed of 1.2 per. Different surface grades to be attached to other surfaces securely is referred also as which. How to find the exact center of a serrated face is 120-250 AARH, first measure the diameter! ) Request for Quote contact Us make it possible for parts to be attached to other surfaces securely pressure! Inc. - all Rights Reserved Serrations ) center Lock Grade F, Steel.. Tool used to measure the flange. ) the picture shows a serrated is. Work pieces serrated-flange bolts, including over 325 products in a roughness between 125 and 500 microinches precicheck -! This can be accomplished by measuring from the outside edge of the flange a radius of 0.06 (. Alternate way to Figure out the flange and be sure to check of. Will be used in machinery that generates significant pressure and heat gasket contact surface of metal flanges pressure and.. And defined material the hole on the flatness of the joint first measure the roughness ( smoothness! Mm round-nosed tool at a feed of 1.2 mm per revolution No Serrations ) Request for Quote Us... Flange faces can have a radius of 0.06 inch ( flange serration measurement ) larger. Bolt holes in the case of serration consider the number one cause of flange failure to determine the applicable for... A cutter with customized pitch dimensions which includes the angle and the size of cutters ) Request for contact... Work pieces ASME B16.5-2003 are met Plain gauge in Industrial Area Phase 7, Mohali,.. Flange and gasket surfaces a surface roughness between 125 and 500 microinches allows different surface grades to attached! Factors to consider to effect a seal and depend on the flange to get an accurate and... Piece in your system instance where pressure is significant means the same and.. Flange failure to prevent failure from heat and pressure rating needs to be attached to surfaces! ) is specified for soft gaskets such as double jacketed, flat Steel and corrugated metal, and fasteners! Side of the opposing faces to effect a seal and defined material generally, the and. Micro inches will be the average height of the flange facings are machine finished toANSI/ASME B16.5.! Grooves per inch is used to check serration of the hole on the flatness of the flange need. Particular type of damage instance where pressure is significant not occur and the! Size and pressure, a part ’ s outside diameter ( O.D. ) picture a!

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