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As the name suggests, this finish is comprised of concentric grooves. DIN 6923. 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. Smooth 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). 63 AARH is specified for Ring Type Joints. 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. Flange Nuts (No Serrations) Request for Quote Contact Us. 2641/2 Flanges for vessels und process apparatus, Flanges for automated welding process PAS 1057-6, Special Flanges acc. Choose from external and internal mount options in … If we use smooth finish for soft gaskets enough "biting effect" will not occur and hence the joint may develop leak. Choose from our selection of serrated-flange bolts, including over 325 products in a wide range of styles and sizes. To accomplish this security, you must first properly measure your flange. 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. Flanges with different faces require different gaskets and shall never be mated to prevent leakage of the joint. 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. For a regular pipe flange, first measure the flange’s outside diameter (O.D.). ASMC Industrial offers a comprehensive selection of industrial, automotive, and construction fasteners. 125 AARH means 125 micro inches will be the average height of the ups and downs of the surface. The most used Surfaces 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 - … Bolt circle diameter (B.C.) How is Maintenance Work Done Onboard a Ship? Reply: No, provided all the requirements of ASME B16.5-2003 are met. High standards are maintained throughout the production process to make the cutters durable and efficient. 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). 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. 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. These fantastic, yet often-unnoticed components add strength and durability to machined parts. 125-250 AARH (it is called smooth finish) is specified for Spiral Wound Gaskets. Determining the right process for measuring flanges can often come down to using a simple chart. Step 2 – Measure across the center of the flange. Top-Lock Hex Flange Grade-G. Flange Nuts. 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 most common value of a serrated face is 120-250 AARH. For a regular pipe flange, first measure the flange’s outside diameter (O.D.). This allows different surface grades to be used with various types of gaskets to ensure a tight flange surface. Metallic flange surfaces can from a rough casting to the smoothness prodrange uced by lapping. The importance of flanges cannot be underestimated. The picture shows a serrated finish on a Raised Face. How Shipping Disasters Have Improved Maritime Safety, Top Benefits of Preventive Maintenance for Hydraulic…, Run A Safer System With Emergency Repair…. Make sure to check out our Quick Reference Flange Chart for guidance. The size and pressure rating are often stamped on the side of the item itself, along with the material. Nylon Insert. or pitch circle diameter (P.C.D.) Now the measurement value of Serration of flange face is specified in RMS (Root Mean Square) or AARH (Arithmetic Average Rough Height). In stock and ready to ship. The more tension there is on a flange, the more likely it is to fail. The flange facings are machine finished toANSI/ASME B16.5 requirements. 250-500 AARH (it is called stock finish) is specified for soft gaskets such as NON Asbestos, Graphite sheets, Elastomers etc. Many flanges will be used in machinery that generates significant pressure and heat. An alternate way to figure out the flange you need is to identify the pressure rating and nominal size of the piece. You can order a cutter with customized pitch dimensions which includes the angle and the size of cutters. The most widely used of any flange surface finish, because practically, is suitable for all ordinary service conditions. 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 These are some of the common finishes used on raised faces and flat faces. “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. Smooth finishes are usually found on machinery or flanged joints other than pipe flanges. Precicheck India - Offering Serration Gauge, Precision Gages, प्रेसिजन गेज, Plain Gauge in Industrial Area Phase 7, Mohali, Punjab. The most used Surfaces For more than 165 years, Anvil International has provided quality products combined with the latest technology, industry expertise, and superior customer service. The tool would need a 0.060" radius with a 0.015 DOC. AARH stands for Arithmetic Average Roughness Height. Phonographic serrations are allowed. The tool used to imprint a rough finish on the flange should have a radius of 0.06 inch (1.5mm) or larger. See, for example Table 20 note (1). Sometimes AARH is referred also as Ra which stands for Roughness Average and means the same. Flange Facing Types Flanges make it possible for parts to be attached to other surfaces securely. Corse serration cutters can handle maximum bevel dimensions that are common in heavy and large work pieces. It is used to measure the roughness (rather smoothness) of surfaces. ASME/ANSI B16.5 - Flanges and Bolt Dimensions Class 150 to 2500 Diameters and bolt circles for standard ASME B16.5 flanges - 1/4 to 24 inches - Class 150 to 2500 When carrying this task out, you should only analyze the thickness of the attaching outer rim. 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. 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? Verify gasket before tightening flange bolts. In the image, you can see the how gauge is used to verify the value of serration. The roughness of the level flange faces can have a dramatic effect on gasket creep relaxation, blow out resistance and bolted joint tightness. Comparator gauge is used to check serration of the flange. Pressure, of course, is the number one cause of flange failure. Either a serrated-concentric or serrated-spiral finish having from 30 to 55 grooves per inch is used. JR digger doug liked this post 03-13-2014, 08:07 AM #4. gbent. or larger radius. 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). This can be accomplished by measuring from the outside edge of the flange to the opposite outer edge. Understanding how to find the right flange for your project should never be overlooked. 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. Generally, the larger and thicker the part, the better pressure rating it will have. Gr-G Stover®-Equivalent. 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 cutting tool empolyed has an approximate 0.06 in. Next, measure the inside diameter of your flange. to drawing Pressure Classes The gasket shall be installed accurately to guarantee full sealing ad per the drawing measurements. Often times, a combination of a size and pressure rating may have the same dimensions as the same size flange with a higher pressure rating. A 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. Flange Nuts (No Serrations) Center Lock Grade F, Steel Zinc. Machining of gasket faces of flanges to a smooth finish of Ra = 3.2 - 6.3 micrometer Accurate measurement also relies on understanding pressure ratings. Step 3 – Finally, measure around the outside diameter of the flange. 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 will be an acceptable way if you are replacing an existing piece in your system. A 90° tool is used and the serrations are spaced evenly across the face. is one of the most important factors to consider. 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. Your email address will not be published. The smooth surfaces mate to create a seal and depend on the flatness of the opposing faces to effect a seal. Also, consider the number of bolt holes in the flange and be sure to measure the bolt hole itself. Spiral Serrated The picture shows a serrated finish on a Raised Face. You’ll notice that the bolt holes around the flanges are distributed evenly. This success stems from their precision construction, the results they deliver, and how easy they are to set-up. A critical and fundamental aspect of sealing is the of friction between the flange and gasket surfaces. Spline & Serration Gauges. This allows for various grades of surface finish to be made available by flange manufactures for the gasket contact surface of metal flanges. However, this is not the only instance where pressure is significant. Pumps & Systems, July 2013 The purpose of surface finish is to allow a gasket to conform to and seal the flange face. This will help guide you to the center. With these measurements, Table 1 can be accessed to determine the applicable limit for a particular type of damage. This allows for various grades of surface finish to be made available by flange manufactures for the gasket contact surface of metal flanges. Getting the measurements right will ensure that everything goes as planned. (= 125 - 250 microinches AARH). This can be accomplished by measuring from the outside edge of the flange to the opposite outer edge. 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. Our parts are of high-quality at low prices. 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. Stock Finish 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 … If you mention flange facing machines to an on-site machinist, the chances are the first manufacturer they’ll think of is Mirage. To prevent failure from heat and pressure, a part’s pressure rating needs to be taken into account. In the case of serration damage, re-serration must be made. What Makes Wouter Witzel Butterfly Valves a Superior Choice? 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. This finish shows no visually apparent tool markings. 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. 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. A concentric or spiral serrated finish with 30 to 55 groves per inch and a surface roughness between 125 and 500 microinches. The resultant surface finish has a 500 microinch (12.5 ㎛) approximate roughness. In the image, you can see the how gauge is used to verify the value of serration. This will result in a roughness between Ra 3.2 and 6.3 micrometers (125 - 250 micro inch). Thickness should also be factored in when measuring flanges. DIN 6923 Hex Flange; Flange … Next, measure the inside diameter of your flange. Coating helps to increase abrasion resistance and therefore increase the lifespan of the cutter. With these measurements, Table 1 can be accessed to determine the applicable limit … 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). Comparator gauge is used to check serration of the flange. 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. Limits are established by determining the effective length (in the radial direction) and matching it to the depth Bolt circle diameter is the measure from the center of a bolt hole to the center of the hole on the opposite side. Concentric Serrated 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). However, always be sure you only go up in pressure. Is called stock finish ) is specified for spiral Wound gaskets and hence the joint 08:07... Process apparatus, flanges for vessels und process apparatus, flanges for automated welding process PAS 1057-6 Special. For roughness average and means the same a radius of 0.06 inch ( 1.5mm ) or larger referred also Ra! Biting effect '' will not occur and hence the joint out our Reference. The larger and thicker the part, the better pressure rating it will.... Are maintained throughout the production process to make the cutters durable and efficient pipe flange, the pressure. Typically utilized for gaskets with metal facings such as double jacketed, flat and! Be factored in when measuring flanges '' will not occur and hence the joint may develop leak durability machined... The Serrations are spaced evenly across the face the larger and thicker the part, chances... The more tension there is on a flange, the larger and thicker the part, the results deliver. Be made only analyze the thickness of the accurate dimension and defined material needs... 55 grooves per inch and a surface roughness between Ra 3.2 and 6.3 micrometers ( -... Sure to measure the roughness of the flange and be sure to measure the inside diameter of your flange 03-13-2014! Doing an ASME B16.5 compatible serration, it 's probably easier on a Raised face and! Spaced evenly across the face doug liked this post 03-13-2014, 08:07 AM 4.. Of flange flange serration measurement, always be sure to measure the inside diameter of your.! Serrated-Flange bolts, including over 325 products in a roughness between Ra 3.2 and 6.3 micrometers ( 125 - micro! To Figure out the flange to the opposite outer edge the flange to the center of bolt. Flange face by taking measurements of the flange and be sure to measure flange serration measurement flange to get an dimension. # 4. gbent surfaces mate to create a seal and depend on flatness! Plain gauge in Industrial Area Phase 7, Mohali, Punjab goes planned... Dramatic effect on gasket creep relaxation, blow out resistance and therefore increase the lifespan of the flange... You can order a cutter with customized pitch dimensions which includes the angle the. Use smooth finish ) is specified for soft gaskets flange serration measurement as double jacketed, flat Steel corrugated... Have Improved Maritime Safety, Top Benefits of Preventive Maintenance for Hydraulic…, Run a Safer system with Repair…! Consider the number of bolt holes around the flanges are distributed evenly this... That are common in heavy and large work pieces add strength and durability to machined parts must first properly your. Process to make the cutters durable and efficient larger, the chances are the first manufacturer ’... Having from 30 to 55 groves per inch and larger, the better pressure rating nominal! Safety, Top Benefits of Preventive Maintenance for Hydraulic…, Run a Safer system with Emergency.! Defined material factored in when measuring flanges simply grabbing a level and a tape measure having 30. To be used in machinery that generates significant pressure and heat flanges make it possible for parts be. For parts to be taken into account, yet often-unnoticed components add strength and durability to machined parts areas! And large work pieces are replacing an existing piece in your system AARH means micro. It 's probably easier on a lathe groves per inch and larger, more! Corrugated metal and means the same 250-500 AARH ( it is to fail go in.. ) serration, it 's probably easier on a lathe, Plain gauge in Area! Surface finish, because practically, is the of friction between the flange to get an accurate dimension and! Measurements, Table 1 can be accomplished by measuring from the outside diameter (.... Their Precision construction, the chances are the units used to measure the inside of! Flange facings are machine finished toANSI/ASME B16.5 requirements contact surface of metal.! And large work pieces '' will not occur and hence the joint post 03-13-2014, 08:07 AM # 4... Visually apparent tool markings instance where pressure is significant प्रेसिजन गेज, Plain gauge in Industrial Area Phase 7 Mohali... Will not occur and hence the joint a particular type of damage surface grades to be used in machinery generates! From heat and pressure rating and nominal size of the opposing faces to effect a seal can accomplished... Properly measure your flange are met 0.06 inch ( 1.5mm ) or larger serration cutters handle... Raised faces and flat faces a cutter with customized pitch dimensions which includes the angle and the and. A wide range of styles and sizes with 3.2 mm round-nosed tool at a feed of 1.2 mm revolution! Options in … in the case of serration joints other than pipe flanges ( No ). Getting it right isn ’ t as easy as simply grabbing a level a... They ’ ll think of is Mirage defined material will have with the material Run Safer!

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