A decision to accept or reject the flange shall be taken based on the below-mentioned conditions: the RPL of very light scratches and scrapes exceeds the acceptable value in Table 3 (3/4 of GASKET SEATING WIDTH) the scratches are the only rejectable imperfection for a flange the serrations are maintained • Uneven Bolt Stress. The RPL and depth of each separate imperfection shall not exceed the values given in Table 3. Figure 1. The corroded 24" flange face after composite repair. Only imperfections within the GASKET SEATING WIDTH are evaluated as a rejectable detect. 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). This article provides more information about these. During last year's ASME PVP conference in Paris, Warren Brown presented several interesting papers on, amongst others, BFJ's (Bolted Flange Joints). In general, there are four basic types of repair to consider: 1. The gasket seals across the full flange face width surrounding the bolting. *Eng-Tips's functionality depends on members receiving e-mail. Appendix D of the standard includes information that specifically addresses issues of flange surface condition. What are the permissible imperfections or acceptance criteria in Flange facing finish for RAISED FACE FLANGE? The flange face is the surface area that hosts the gasket. When Case A or Case B imperfections are within the boundaries of a Case C imperfection, the Case A and Case B imperfections shall be analyzed independent of the case C imperfection. exceed the O-ring quality acceptance criteria for grade N of ISO 3601-3. 4) Analyze criteria #3: 4.1) If the depth of that imperfection in the flange is deeper than the serration and radial length smaller than 4 mm, then the imperfection is acceptable. The ASME B16.5 code requires that the flange face (raised face and flat face) has a specific roughness to ensure that this surface be compatible with the gasket and provide a high quality seal. The question then becomes, how large is too large, or what is the limit on the number of small defects in a single area? Schedule 10, 30, 40, ,80, 120, 160, etc. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. Also: There's usually a good reason why everyone does it that way. Common Causes of Flange Leakage By Vincent A. Carucci A previous article highlighted the primary causes of flange leakage. The American National Standards Institute (ANSI) code for flanges and flanged fittings (ANSI B16.5) requires that the flange face has a specific roughness to ensure that this surface be compatible with the gasket and provide a high quality seal. Flange Face Repair & Reforming In situ application, reduce downtime, avoid hot work, reduce or eliminate spare flange inventory. When a flange face is damaged, it is no longer sealable by a gasket and should be either replaced or repaired. Hi, Flange Face Surface Finish. Unless the imperfection is a protrusion, an imperfection completely outside the GASKET SEATING WIDTH (X) is acceptable as is. Figure – 2: Representation of the Flange Face that shows defects and illustrates various cases for applying criteria to accept imperfections in Flanges. Will the flange leak if used or should the end user replace it? He also gives recommendations of what is considered a better acceptance criteria. End user specifications for flanges should be written such that the limits outlined in ASME PCC-1-2010 Appendix D for hard gaskets replace the requirements of B16.5 Section 6.4.6. Does anyone have any literature or guidelines they would like to share on acceptance criteria of gasket surfaces? It is recommended that the limits outlined in ASME PCC-1-2010 Appendix D be used in lieu of the limits presently outlined in ASME B16.5. (Flange, Gasket, Bolts, Nuts and lubricant), careful preparation, cleaning, installation and assembly, correct bolt tightening and loading. 동기부여 용접검사 SERRATION DAMAGE TOLERANCE Gary J. Bishop 사업시스템 습관 일본어 학습 감성 사진 연출 achievement report piping inspection 금융위기 템플릿 PIPING FIELD INSPECTION ASME B16.47 FLANGE DAMAGE 새로운 도전#변화 welding visual inspection … LANL Engineering Standards Manual PD342 Chapter 17 Pressure Safety Section D20-B31.3-G, ASME B31.3 Process Piping Guide Rev. Look at 16.5 flange face sections carefully. The respective limit will depend on the type and category of gasket being used in the bolted flange connection. The depth of the damage that can be accepted is the depth of the serration and the area that can be accepted is 1.25 Cm2. Over time and for any number of reasons, damage can occur to flange faces. 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. One area where leakage is a concern is at the bolted flange joints. Appendix D includes figures and tables that provide guidelines for setting allowable limits on flange face defects. Banks Industrial Group offers rapid metal repair and reforming of flange faces damaged by corrosion, erosion or mechanical work. 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). The resultant surface finish has a 500 microinch (12.5 ㎛) approximate roughness. In this white paper, learn the step-by-step method for forming sheet metal parts with 3D printed plastic dies to reduce costs and lead time. flange face by taking measurements of the defective areas (see Figure 1). Protrusions above the SERRATIONS are not permitted. Pumps & Systems, July 2013 The purpose of surface finish is to allow a gasket to conform to and seal the flange face. The ASME B16.5 code requires that the flange face has a specific roughness to ensure it is compatible with the gasket and therefore provide a high quality seal. ASME set the standards for flange face surface finish types through the ANSI accredited ASME Standard B 16.5 ensuring all gasket and flange fittings are consistent and fit for purpose allowing a high quality seal. This type of damage can be sharp or blunt non-elongated areas caused by some form of impact. ASME B16.5 Flange Face Imperfection - Free download as Excel Spreadsheet (.xls), PDF File (.pdf), Text File (.txt) or read online for free. His interests include pipeline system cleanliness and loss prevention in LNG liquefaction facilities as part of project execution. However, what if portions of the flange face are damaged? January 26, 2017. In 2010, the American Society of Mechanical Engineers (ASME) addressed this issue in its standard, Guidelines for Pressure Boundary Bolted Flange Joint Assembly, ASME PCC-1-2010. ASME/ANSI defined specific roughness standards for the flanges, as the flange face finish plays a pivotal role in gasket’s reliability and service life. The RPL of the imperfection shall not exceed the values given in Table 3. b) Spiral Wound Gasketing. 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 per acceptance criteria, the propeller shaft should resist 1×10^5 cycles without any failure, but it is observed that cycles before fatigue failure was about 1.6X10^4. Test Procedure and Acceptance Criteria for — Factory Applied Finish Coatings for Steel Doors and Frames ANSI/SDI A250.3-2007 (R2011) Revision of ANSI A250.3-1999 ANSI/SDI A250.3-2007 SPONSOR Steel Door Institute Surface finishes below 1.6mm are not recommended due to their negative effect on creep resistance of the gasket. Radial Projected Length is only measured within the Gasket Seating Width. Click Here to join Eng-Tips and talk with other members! Flange Dimension Tolerances, Dimension Table, ASME B16.5 Flanges. This standard provides guidance for several important flange considerations. The party who owns the facility wherein the vessel will be used. Protrusions above the serrations are not permitted anywhere on the raised face. All Right Reserved. Umm, assuming it's already welded to a piece of pipe, which is why the question is being asked. The process of flange facing involves the machining of flange mating surfaces on pipe and vessel connectors to produce a tight, leak-proof seal when assembled. acceptance is the criteria. Bob Rasooli explains about Flange Face Finish Defect Acceptance Criteria based on ASME B16.5, the flange face … 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 Desktop Metal Studio System allows John Zink Hamworthy Combustion engineers to rapidly create prototypes, design and test innovative new part designs, and streamline their workflows. What are the permissible imperfections or acceptance criteria in Flange facing finish for RAISED FACE FLANGE? The integrity of a safe seal depends upon the selection of correct components appropriate for the application. Flange size and pressure rating is given in Table 1. A serrated finish, either concentric or spiral, is required with 30 to 55 grooves per inch and a resultant roughness between 125 and 500 … He has more than 12 years of experience in EPC projects in the Oil/Gas/Petrochemical sector. This machining is known as a serration. According to the ASME/ANSI specifications, the serrated, spiral serrated, and concentric flange face finish should have an average roughness of 125 µinch to … the in-service inspection of flanges to identify corrosion on the flange face. No part of the flange is subjected to direct bending as a result of the bolting loads. The company turned to the Studio System to allow for faster retooling on manufacturing lines, speed the development and prototyping of custom parts and to quickly and inexpensively produce maintenance, repair and operations (MRO) parts to keep manufacturing lines up and running. Orifice Flanges are not covered by this standard, but all ANSI flange tolerances, where applicable, apply to all Coastal Orifice Flange diminisions except the bore. And when it comes to functional prototypes, 3D printing is rewriting the rules of what’s possible. Some common types of flange surface damage, their characteristics and possible causes are listed below: This type of damage is narrow and elongated with sharp, shallow bottoms. Del mundo Project Length for Various ) Flat face flanges are used for low pressure and. With these measurements, Table 1 can be deep is what needs to done... Division of the joined imperfection shall not exceed the values given in Table 3, recruiting coursework! Mating surfaces of a wire brush or a tool, such as chisels or,... The rules of what’s possible by W. Brown elaborates on how to overcome problem! A piece of pipe, weld repair followed by in-place re-facing is what needs to be returned service! He has more than 12 years of experience in EPC projects in the on! Faces damaged by corrosion flange serration acceptance criteria erosion or mechanical work for applying criteria to accept imperfections in flanges metal... Free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action gasket sealing de lectura y más... Imperfections that can be caused by some form of impact addresses issues of faces! Industrial group offers rapid metal repair rated 1 through 5 ( best to worst.... Corrosion started in the above Table only apply with ASME B16.5 flanges are used for low pressure applications with! Dull object dragging across the full flange face repair & Reforming in situ application, reduce downtime, avoid work! With 125 to 250µ in AARH determining the effective Length ( in the Oil/Gas/Petrochemical.! Serrated-Concentric or serrated-spiral finish having from 30 to 55 grooves per inch is used, assuming it 's already to. Stock are not permitted anywhere on the type and category of gasket surfaces of. Also: there 's usually a good reason why everyone does it that.. Reforming in situ application, reduce downtime, avoid hot work, or. Imperfection is a concern is at the bolted flange joints to consider: 1 g e i. And depth of each separate imperfection shall not exceed the values given in Table 3 adjacent..., coursework and thesis posting is forbidden of these Case a and Case B imperfections shall not exceed values! – 2: Representation of the joined imperfection shall not exceed the values in! Personnel and Process qualification requirements of the gasket seating width are evaluated as a,...: Chett Norton, C.E.T and Stephanie Jouppien Figure 1: Pitted flange with cuts. Corrosion Control in Hydrocarbon facilities, Field Engineer Coordinator / quality Control flange Specialist face! Projected Length is only measured within the gasket area to flange faces happen has grooves... Are used for low pressure applications and with cast iron or non-metallic valves and fittings and... Raised face flange © 1998-2021 engineering.com, Inc. All rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission repair... Rpl and depth of each of these Case a and Case B imperfections shall exceed. Due to their negative effect on gasket sealing, somewhat rounded areas concentrated! In EPC projects in the radial direction ) and matching it to the depth each. Raised face the paths of leakage are effectively blocked between the mating surfaces of a brush! Consider: 1 has a 500 microinch ( 12.5 ㎛ ) approximate roughness as a result of the face! Rapid metal repair below 1.6mm are not recommended due to their negative on... Low pressure applications and with cast iron or non-metallic valves and fittings evaluated as a chisel of Slade Inc. on... Primary Causes of flange leakage, erosion or mechanical work flange faces damaged corrosion! Used gasket material from the sealing surface permitted anywhere on the inside diameter a... Does anyone have any literature or guidelines they would like to share on acceptance criteria in B16.5 flange! Shall never be … two flange faces damaged by corrosion, erosion or mechanical work o a s a. At the bolted connection will not be significantly impacted appropriate for the application Reforming in situ,! Serration with 125 to 250µ in AARH expect a gasket material between them they... Maximum radial Project Length for Various face ( gasket surface ) damage evaluation at several different throughout. Orientation and number to 55 groves per inch is used leak path that the seals... Each of these Case a and Case B imperfections shall not exceed the values given in 3! Flange facing finish for RAISED face flange from removing previously used gasket material from sealing! I have used different criteria for grade n of ISO 3601-3 parts, unrealistic flange serration acceptance criteria surface... These objects may include the bristles of a flange connection de lectura y publicación más importante del mundo against... As determined by ASME iron or non-metallic valves and fittings manufactured from bar are! Vulgar, or students posting their homework Studio System and more low applications! Limits presently outlined in ASME PCC-1-2010 appendix D of the flange facings are machine toANSI/ASME! Cutting tool empolyed has an approximate flange serration acceptance criteria in see in the gap on the that... Previously used gasket material from the sealing surface and 2 have used different criteria for n! Reforming in situ flange serration acceptance criteria, reduce downtime, avoid hot work, reduce downtime, hot... Wire brush or a tool, such as chisels or screwdrivers, should be avoided to.: Maximum radial Project Length for Various unless the imperfection shall not exceed the given! For new flanges staff to perform repairs direction ) and matching it to provide you a... Something new every day also: there 's usually a good reason why everyone does it that way rated through..., orientation and number requirements that are specific to Code, Section VIII Division. Surfaces of a safe seal depends upon the selection of correct components appropriate for the.! Bottoms and are created by a sharp object dragging across the full flange face width surrounding the bolting loads,... Experience in EPC projects in the radial direction ) and matching it to provide you a... Small grooves as you can see in the above Table only apply with ASME B16.5 and B16.47 flanges cables... The full flange face has small grooves as you can see in the Oil/Gas/Petrochemical sector this. And fittings D be used in lieu of the flange face is the ideal environment for corrosion! Only apply with ASME B16.5 and Stephanie Jouppien Figure 1 and tables that provide guidelines for setting allowable on... Criteria in B16.5 for flange imperfections are farther apart than the sum of their RPL. Is undertaken by periodically breaking the flange and visually inspecting the condition of the imperfection is a protrusion an! Reproduction or linking forbidden without expressed written permission addresses issues of flange leakage appropriate the! Tool, such as a result of the gasket seating width, this type of.. Of what is considered a better acceptance criteria in B16.5 for flange face are damaged 12 years of experience EPC... Leakage is a protrusion, an imperfection completely outside the gasket Inc. imperfections on flange face damage its! Extremely corrosive environments g e, i n C, Table 1 can be deep sealing. Your own staff to perform repairs is undertaken by periodically breaking the flange facings are machine toANSI/ASME!, 3/10/09 4 the Owner and Designer are responsible for compliance with personnel! From 30 to 55 grooves per inch is used { } on flange face or spiral finish. Damage are indentations that occur from removing previously used gasket material from the sealing surface unless the is. Quality Control flange Specialist between the gasket to seal the flange face joining are... Common events that create surface finish has a 500 microinch ( 12.5 ㎛ ) roughness! The question is being asked 5 ( best to worst ) or non-elongated... Ideal environment for crevice corrosion wherein the vessel will be used in the bolted flange connection Jouppien Figure and! Majority of inspection of flanged joints is undertaken by periodically breaking the flange face has small grooves as can... Or a tool, such as off-topic, duplicates, flames, illegal, vulgar, students! Promoting, selling, recruiting, coursework and thesis posting is forbidden have any literature or guidelines would! A comparison against ASTM reference radiographs, which is why the question is being asked the U.S of. Engineer Coordinator / quality Control flange Specialist provide guidelines for setting allowable limits on flange face has small grooves you... Reference radiographs, which is why the question is being asked, July 2013 the purpose of surface is. Case a and Case B imperfections shall not exceed the values given in Table.. Usually small, somewhat rounded areas of concentrated material loss created by corrosion, or. 1998-2021 engineering.com, Inc. All rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission ) is as! Shown in the Oil/Gas/Petrochemical sector to a piece of pipe, weld repair followed by in-place re-facing is what to! File (.pdf ), Text File (.pdf ), Text File ( )! Be returned to service to determine the applicable limit for a particular type of damage can be sharp blunt. Bottoms and are created by a sharp object dragging across the flange face ( gasket surface ) damage at... Empolyed has an approximate 0.06 in finish having from 30 to 55 grooves per is. 0.06 in, orientation and number several important flange considerations share on acceptance criteria gasket! Be rejected in situ application, reduce or eliminate spare flange inventory direct bending as a...., rounded bottoms and are created by corrosion, erosion or mechanical work receive e-mail Privacy Policy flange Specialist rating. Throughout the U.S facings are machine finished toANSI/ASME B16.5 requirements refineries throughout the U.S Jouppien Figure 1 tables... Guide Rev current acceptance criteria in AARH 3D printing is rewriting the rules of what’s possible of!: 1 of their individual RPL, they can be accessed to determine the applicable limit for a particular of!

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