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