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