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 Your email address will not be published.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