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. This Handbook is part of a mutual Appendix to Article – Flange Face Inspection Criteria. Acceptance criteria for scratches and indentations in plastic pipes Gunnar Bergström, Mathias Flansbjer, Linda Karlsson, Sven-Erik Sällberg och Kristian Thörnblom Building Technology and Mechanics SP Report 2009:21E SP “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. Either a serrated-concentric or serrated-spiral finish having from 30 to 55 grooves per inch is used. 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. LANL Engineering Standards Manual PD342 Chapter 17 Pressure Safety Section D20-B31.3-G, ASME B31.3 Process Piping Guide Rev. 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). I have used different criteria for flange face (gasket surface) damage evaluation at several different refineries throughout the U.S. Over time and for any number of reasons, damage can occur to flange faces. *Eng-Tips's functionality depends on members receiving e-mail. ASME B16.5 Flange Face Imperfection - Free download as Excel Spreadsheet (.xls), PDF File (.pdf), Text File (.txt) or read online for free. Also: There's usually a good reason why everyone does it that way. 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. An objective of the report presented is to develop relatively simple but conservative methods of evaluating the adequacy of piping products used in Code Class-1, Class-2, and Class-3 piping systems. For tongue and groove flange facings or for very thin gaskets (0.4mm or below), a surface finish of 1.6mm to 6.3mm Ra (63 to 200 in. The gasket seating width “X” is defined in Figure 1 and Tables 1 and 2. The RPL shall include both defects. It is hard to imagine why new flanges with a 0.25 inch deep defect in the flange surface finish which goes across a quarter of the gasket seating surface should be considered acceptable. The respective limit will depend on the type and category of gasket being used in the bolted flange connection. Appendix D of the standard includes information that specifically addresses issues of flange surface condition. All the paths of leakage are effectively blocked between the gasket and flange. - Flange의 Serration API ST’D 600(Steel Gate Valves, Flanged or Buttwelding Ends) 또는 ANSI B16.34에 따른 Valve의 Flange는 ASNI B16.5(Pipe Flanges and Flanged Fittings)에 따른 평면좌(Raised Face) 및 Large Male and The flange face is the surface area that hosts the gasket. Permissible leak rate from atmosphere to jacket in case of ... Serrated Raised Face (RF) flanges with serration for pressure rating class ≤ PN 250 and Ring Joint (RJ) flanges for pressure rating class ≥ PN 420 as per ASME B 16.5. Flange Face FF flanges are normally used for the least arduous duties, such as low-pressure water piping having class 125 and class 250 flanges and flanged valves and fittings. flange face by taking measurements of the defective areas (see Figure 1). f) Pipe Schedule: only for Weld Neck, Socket Weld, Composite Lap Joint and Swivel Ring flanges where the flange bore must match that of the pipe, e.g. Table – 3: Maximum Radial Project Length for Various. Flange Dimension Tolerances, Dimension Table, ASME B16.5 Flanges. Tools, such as chisels or screwdrivers, should be avoided. Serrated Finish/125 AARH : Serration with 125 to 250µ in AARH. With these measurements, Table 1 can be accessed to determine the applicable limit for a particular type of damage. Whether the gasket can successfully seal these damaged areas depends on their size, depth, orientation and number. Dents sometimes result from equipment collisions caused by positioning the mating flanges using cables and rigging. 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. What are the permissible imperfections or acceptance criteria in Flange facing finish for RAISED FACE FLANGE? If it's new, send it back! The various cases that are illustrated in Figure 2 are described below: When two adjacent imperfections are closer than the sum of their individual RPL, they shall be joined together as a single imperfection. He also gives recommendations of what is considered a better acceptance criteria. 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. (FSA) and the Flange Gasket Division of the European Sealing Association (ESA). 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. @2021 - Oilman Magazine, LLC. Figure 1. - Flange의 Serration API ST’D 600(Steel Gate Valves, Flanged or Buttwelding Ends) 또는 ANSI B16.34에 따른 Valve의 Flange는 ASNI B16.5(Pipe Flanges and Flanged Fittings)에 따른 평면좌(Raised Face) 및 Large Male and Female Flange의 Gasket 접촉면에 Serration 가공을 할 필요가 있다. Flange face repair — To machine the flange face sealing surface, a flange facing machine is the ideal product to get the job done quickly and accurately. Radial Projected Length is only measured within the Gasket Seating Width. 2, 3/10/09 4 The Owner and Designer are responsible for compliance with the personnel and process qualification requirements of the codes and standards. We have a WNRF Flange of Dia 20" of which the serration face is damaged (Approximately 3mm Depth and Length 60mm) due to the improper handling. 9.9.2.1 Flat face (FF) Flat face flanges are used for low pressure applications and with cast iron or non-metallic valves and fittings. The cutting tool empolyed has an approximate 0.06 in. Engineering Codes, Standards & Certifications, Dissecting the Dinosaur; Problems With B16.5 and B16.47 Flange Standards, eBook - Functional Prototyping Using Metal 3D Printing, Case Study - Eaton Corporation: Rapid Tooling and MRO Parts for an Automotive Supplier, eBook - John Zink Hamworthy: Printing Complex Burner Tips and On-Demand Shop Floor Tools, White Paper - Sheet Metal Forming with 3D Printed Dies. acceptance is the criteria. Questions about Flange face, height, and serrations. Only imperfections within the gasket seating width, “X” are to be considered as imperfections that can be rejected. Photo courtesy of Slade Inc. Imperfections on flange faces happen. Copyright © 1998-2021 engineering.com, Inc. All rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission. These components are made of austenitic stainless steel that at 4K is known to exhibit instable plastic flow – the so-called serration effect, i.e. The question then becomes, how large is too large, or what is the limit on the number of small defects in a single area? He is currently working as Field Engineer in an LNG Liquefaction Project in Southwest Louisiana. 63 AARH : 32 to 63µ in AARH. An imperfection crossing the borderline of the GASKET SEATING WIDTH from the inner side of the serrated face and having a depth less than 0.005” below the serrations shall have the RPL measured only with respect to the portion occurring within the GASKET SEATING WIDTH. This is accomplished when the bolt load compresses the gasket to a level of tightness that allows it to fill the gap between the mating faces and fill the small imperfections in the sealing surfaces. What are the permissible imperfections or acceptance criteria in Flange facing finish for RAISED FACE FLANGE? The RPL of the imperfection shall not exceed the values given in Table 3. A concentric or spiral serrated finish with 30 to 55 groves per inch and a surface roughness between 125 and 500 microinches. Surface finishes below 1.6mm are not recommended due to their negative effect on creep resistance of the gasket. No machining or grinding is permitted, The damaged serration cannot be reconditioned/repaired, the only way is to have the machining done so as to have the new serrations made on the surface. Sheet metal forming is the most cost-effective forming procedure today for manufacturing parts at large quantities. Check the FF: Flange serration and Gasket Verification (class and type) Damage Criteria for Flange Raised Face: See SAIC -L -2002 Flange Alignment, Tilt 1.6mm,2.4 bolt hole acceptable tolerance Bolt and nuts material, color code and stencil, Tightening Sequence Check the torque value Torque wrench certificate. The flange facings are machine finished toANSI/ASME B16.5 requirements. Low bolting torques, over-tight bolt loads, weak bolt material, inadequate bolt/washer/nut lubrication, poor flange design or materials, poor gasket cutting or storage, improper installation, may each and all contribute to seal failure. January 26, 2017. With these measurements, Table 1 can be accessed to determine the applicable limit for a particular type of damage. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Typical facing finishes are defined in centerline average or roughness average R a, which is the arithmetic average of the absolute values of the profile height deviations from the mean line.The facing finish of ASME B16.5 flanges shall be judged by visual comparison with R a standards stipulated by ASME B46.1 and not … 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. In general, there are four basic types of repair to consider: 1. Which instrument/comparator can I … 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. All dimensions are in inches These flanges will be furnished with a 1/16" raised face unless Raised Face (RF) The Raised Face flange is the most common type used in process plant applications, and is easily to identify. the in-service inspection of flanges to identify corrosion on the flange face. The paper by W. Brown elaborates on how to overcome this problem. 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. An imperfection crossing the borderline of the GASKET SEATING WIDTH from the inner side of the serrated face and having a depth greater than or equal to 0.005” below the serrations shall have the portion of the imperfection that is inside the GASKET SEATING WIDTH eliminated. 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 … Subscribe to OILMAN Today, our industry newsletter covering oil and gas business news, events, information and trends shaping the market, delivered to your inbox. SURFACE INSPECTION ACCEPTANCE CRITERIA DOC #: QAP 3.0-3 PROJECT #: N/A REVISION: D PAGE: 3 OF 6 4.0 FORMS None 5.0 DEFINITION 5.1 Assembly Tool Mark – Marks made by normal process tooling Frequently, this type of damage is created by a sharp object dragging across the flange face. Pumps & Systems, July 2013 The purpose of surface finish is to allow a gasket to conform to and seal the flange face. Scratches and scrapes having a depth greater than 0.005” below the serration are evaluated with the same guidelines as other imperfections, Cases A, B and D. A decision to accept or reject the flange shall be taken based on the below-mentioned conditions: Nirmal Surendran Menon received his Bachelor of Engineering in Mechanical from Anna University, Tamil Nadu, India in 2005 and Master of Science in Project Management from National University of Singapore in 2010. CLA) is possible. This article provides more information about these. Click Here to join Eng-Tips and talk with other members! This machining is known as a serration. Flange size and pressure rating is given in Table 1. The integrity of a safe seal depends upon the selection of correct components appropriate for the application. Gouges can be caused by objects—such as a screwdriver, flange jack or chisel. These objects may include the bristles of a wire brush or a tool, such as a chisel. • Uneven Bolt Stress. With proper flange design and gasket installation, the stress on the gasket will be sufficient to create a barrier between the pressurized side of the gasket and hold it securely in place. An imperfection crossing the borderline of the GASKET SEATING WIDTH from the outer side of the serrated face shall have the RPL measured only with respect to the portion occurring within the GASKET SEATING WIDTH. Appendix D includes figures and tables that provide guidelines for setting allowable limits on flange face defects. The RPL of the group imperfection shall not exceed the values given in Table 3. two flange faces is the ideal environment for crevice corrosion. Banks Industrial Group offers rapid metal repair and reforming of flange faces damaged by corrosion, erosion or mechanical work. This Practice provides design criteria and construction requirements for pressure vessels constructed in accordance with ASME Boiler and Pressure Vessel Code, Section VIII, Division 1 or Division 2, henceforth referred to as the Code. 1.2 Scope 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. Currently the majority of inspection of flanged joints is undertaken by periodically breaking the flange and visually inspecting the condition of the sealing faces. This author does not have any more articles. Figure – 2: Representation of the Flange Face that shows defects and illustrates various cases for applying criteria to accept imperfections in Flanges. GUIDE TO FLANGE FACING T Y P E S O F F L A N G E D A M A G E , F I N I S H E S , G A S K E T S A N D M A C H I N E T Y P E S TYPES OF FLANGE DAMAGE FLANGE FINISHES For full details of on-site portable No part of the flange is subjected to direct bending as a result of the bolting loads. Flange Face Repair & Reforming In situ application, reduce downtime, avoid hot work, reduce or eliminate spare flange inventory. Gasket Face Serration Repair - Free download as PDF File (.pdf), Text File (.txt) or read online for free. With regular maintenance and removing old, stuck-on gasket\debris, flanges with scratches, pits, dents and dings are a common site in many a plant. Hi, Flange Face Surface Finish. -0 FEAP-UG-FM-94/10 USERJuly 1994 GUIDEFACILITIES ENGINEERING APPLICATIONS PROGRAM AD-A285 275 Corrosion Control Acceptance Criteria for Sacrificial Anode Type, Cathodic Protection Systems by ___Vincent F. … The corroded 24" flange face after composite repair. Bob Rasooli explains about Flange Face Finish Defect Acceptance Criteria based on ASME B16.5, the flange face … LANLEngineering Standards Manual ISD 341-2 Chapter 13, Welding & Joining Section WFP 2-01 – Welding Fabrication Procedure Rev. Values shown in the above table only apply with ASME B16.5 and B16.47 flanges using an ASME B16.20 gasket. Let’s look at flange face damage and its potential effect on gasket sealing. ASME B16.5 Flange Face Imperfection - Free download as Excel Spreadsheet (.xls), PDF File (.pdf), Text File (.txt) or read online for free. Does anyone have any literature or guidelines they would like to share on acceptance criteria of gasket surfaces? During last year's ASME PVP conference in Paris, Warren Brown presented several interesting papers on, amongst others, BFJ's (Bolted Flange Joints). Corrosion Control in Hydrocarbon Facilities, Field engineer Coordinator / Quality Control Flange Specialist. Coastal Flange, Inc. P.O. All Right Reserved. 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 Box 40443 Houston, TX 77240-0443 11906 FM 529 Houston, TX 77041 The flange face has small grooves as you can see in the image. Each joint consists of two mating flanges with a gasket material between them, Figure 2. These are wide and elongated with blunt, rounded bottoms and are created by a dull object dragging across the flange face. The RPL and depth of the joined imperfection shall not exceed the values given in Table 3. e.g. If a defect is large (especially across the radial direction of the flange face) or several defects are grouped in a small area, the leakage path can exceed the ability of the gasket to block it, and leakage can occur. PIP VESV1002 COMPLETE REVISION Design and Fabrication Specification for Vessels March 2012 ASME Code Section VIII, Divisions 1 and 2 Process Industry Practices Page 5 of 44 Owner: The party who owns the facility wherein the vessel will be used. The RPL and depth of each of these Case A and Case B imperfections shall not exceed the values given in Table 3. The only explanation for the level of imperfections tolerated by B16.5 is to sanction poor fabrication and handling practices. Only imperfections within the GASKET SEATING WIDTH are evaluated as a rejectable detect. The material discussed here is is an epoxy-based composite for metal repair. Bolt tightening group approved w/ ID 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. Hi, Flange Face Surface Finish. Over time, the corrosion started in the gap on the inside diameter of a flange can extend to the gasket area. Coastal Flange stocks import and domestic ANSI B16.5 flanges from 1/2" through 24" in classes 150, 300, 400, 600, 900, 1500 and 2500. Subscribe to OILMAN Today, a biweekly newsletter delivered to your inbox covering oil and gas business news, current events and industry information you need to know about. The party who owns the facility wherein the vessel will be used. get whoever improperly handled it to provide you with a new one! The RPL of the imperfection shall not exceed the values given in Table 3. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. Scribd es red social de lectura y publicación más importante del mundo. The gasket seals across the full flange face width surrounding the bolting. Each damaged area will tend to create a potential leak path that the gasket must try to seal. What the damage types have in common is that they reduce the sealing tightness of the gasket against that particular (damaged) area of the flange face. One area where leakage is a concern is at the bolted flange joints. Look at 16.5 flange face sections carefully. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. When a flange face is damaged, it is no longer sealable by a gasket and should be either replaced or repaired. My motto: Learn something new every day To predict the root reasons of earlier failure of flange yoke, a detailed 3D model of flange yoke was developed in CREO version 2 software. Protrusions above the SERRATIONS are not permitted. However, what if portions of the flange face are damaged? Table – D-1M Extracted from ASME PCC-1-2010: Table D-2 (D-2M for metric) Extracted from ASME PCC-1-2010: Table – 1: ASME B16.5 Flanges/B16.20 Gasket Seating Parameters “Y” and “Z” (to Determine “X”), Table – 2: ASME B16.47 Flanges/B16.20 Gasket Seating Parameters “Y” and “Z” (to Determine “X”). According to the ASME/ANSI specifications, the serrated, spiral serrated, and concentric flange face finish should have an average roughness of 125 µinch to … 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. 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. Login. ANSI/MSS SP-55-2011 Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components Visual Method for Evaluation of Surface Irregularities Reference Version (Not for Inspection) Standard Practice When two adjacent imperfections are farther apart than the sum of their individual RPL, they shall be considered two independent imperfections. In Handbook of Valves and Actuators, 2007. Pumps & Systems, July 2013 The purpose of surface finish is to allow a gasket to conform to and seal the flange face. 3mm is too much to expect a gasket to handle. However, depending on the force that created them, they can be deep. Limits are established by determining the effective length (in the radial direction) and matching it to the depth of the same defect. And when it comes to functional prototypes, 3D printing is rewriting the rules of what’s possible. By joining you are opting in to receive e-mail. 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 From: The Fundamentals of Piping Design, 2007Related A brass wire brush is preferred. Flange Face Surface Finish 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. 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. I have used different criteria for flange face (gasket surface) damage evaluation at several different refineries throughout the U.S. Registration on or use of this site constitutes acceptance of our Privacy Policy. Permissible Imperfections in Flange Face finish. or larger radius. Example- Imperfections is from outer to inner side of raise face with a depth of .5mm on serration for 20" diameter of Flange schedule 30 found during visual inspections. The current acceptance criteria in B16.5 for flange imperfections are, at some parts, unrealistic. Course link - https://courses.hardhatengineer.com/ Subscribe -https://goo.gl/9OktFA … Example- Imperfections is from outer to inner side of raise face with a depth of .5mm on serration for 20" diameter of Flange schedule 30 found during visual inspections. His interests include pipeline system cleanliness and loss prevention in LNG liquefaction facilities as part of project execution. This 100%-solids composite technology has been on the market for over 50 years, but is only now gaining acceptance for flange face repair applications. https://oilmanmagazine.com/author/nirmal-surendran-menon/. Common Causes of Flange Leakage By Vincent A. Carucci A previous article highlighted the primary causes of flange leakage. This Handbook is part of a mutual commitment to industry consensus technical education for If the flange connection is expected If the flange connection is expected to be used at temperatures higher than specified in Clause 8, O … Only when all the components of the system are working together in harmony can the seal be expected to provide good performance over a reasonable lifetime. The thing to keep in mind with this is that this is a specification for NEW flanges. The RPL and depth of each separate imperfection shall not exceed the values given in Table 3. 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. This standard provides guidance for several important flange considerations. Download this ebook to learn about parts that John Zink has printed on the Studio System and more. The flange face is predominantly prone to crevice corrosion when flanges are used in extremely corrosive environments. (Flange, Gasket, Bolts, Nuts and lubricant), careful preparation, cleaning, installation and assembly, correct bolt tightening and loading. Unless the imperfection is a protrusion, an imperfection completely outside the GASKET SEATING WIDTH (X) is acceptable as is. Please let us know here why this post is inappropriate. 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. Removing the corroded flange and welding a new one, 2 ANSI AWWA C o a s t a l F l a n g e , I n c . The most common events that create surface finish damage are indentations that occur from removing previously used gasket material from the sealing surface. Umm, assuming it's already welded to a piece of pipe, which is why the question is being asked. Testing and Quality Engineer with experience in driving excellence in creating, editing, and implementing test instructions, quality procedures, and hands-on training in an effort to improve quality and efficiency. The resultant surface finish has a 500 microinch (12.5 ㎛) approximate roughness. A wide range of machine options are available, including models that can be mounted internally or externally (and, in some cases, both). 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. Flanges with different faces require different gaskets and shall never be … Subject: Flange Thickness Date Issued: September 2, 2002 File: 02-02830 Question: According to ASME B16.5-1996 edition, 1998 Addenda (a), is it acceptable for the flange thickness to taper to the edge and be thinner By: Chett Norton, C.E.T and Stephanie Jouppien Figure 1: Pitted flange with steam cuts. Functional prototypes are a key step in product development – they give engineers a chance to test new ideas and designs while also revealing how the product will stand up to real-world use. The RT acceptance criteria that have been addressed on QW- 191.1.2.2 refers to the welder or welding … Serration on the Flange Face. b) Spiral Wound Gasketing. 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. This is not only time consuming but … exceed the O-ring quality acceptance criteria for grade N of ISO 3601-3. If it's on a pipe, weld repair followed by in-place re-facing is what needs to be done. S look at flange face is predominantly prone to crevice corrosion the permissible imperfections or acceptance criteria in facing... Shows defects and illustrates Various cases for applying criteria to accept imperfections in flanges Standards Manual PD342 Chapter pressure... “ X ” is defined in Figure 1 and tables 1 and 2,! A. Carucci a previous article highlighted the primary Causes of flange leakage * Eng-Tips 's functionality depends on their,! Learn something new every day also: there 's usually a good flange serration acceptance criteria why everyone does it that way chisel... Are the permissible imperfections or acceptance criteria are based upon a comparison against ASTM reference radiographs, which are 1... These Case a and Case B imperfections shall not exceed the values given Table... To the gasket can successfully seal these damaged areas depends on their size depth. All the paths of leakage are effectively blocked between the gasket seating width “ X ” are to be to! To seal cost-effective forming procedure today for manufacturing parts at large quantities gasket and flange work reduce! S t a l F l a n g e, i n C a specification for flanges... Of inspection of flanged joints is undertaken by periodically breaking the flange “ fit ” to done... These damaged areas depends on their size, depth, orientation and number, i n...., avoid hot work, reduce downtime, avoid hot work, reduce,! Imperfections on flange face that shows defects and illustrates Various cases for applying criteria to accept imperfections flanges! Finish has a 500 microinch ( 12.5 ㎛ ) approximate roughness specifically issues! Inside diameter of a flange connection negative effect on creep resistance of the same defect gasket Division of the connection... Will depend on the force that created them, flange serration acceptance criteria 2 Zink has printed on the that... Criteria are based upon a comparison against ASTM reference radiographs, which are rated 1 through 5 best! Sanction poor fabrication and handling practices would like to share on acceptance criteria of gasket surfaces face FF. Current acceptance criteria are based upon a comparison against ASTM reference radiographs which... For a particular type of damage can occur to flange faces happen 9.9.2.1 Flat face are. From 30 to 55 groves per inch is used and the flange “ fit ” to be to. Small, somewhat rounded areas of concentrated material loss created by a sharp dragging! Finish types as determined by ASME already welded to a piece of pipe, which is the... D20-B31.3-G, ASME B31.3 Process Piping Guide Rev to 250µ in AARH repair! Only imperfections within the gasket seating width are evaluated as a chisel D of the limits in! Would like to share on acceptance criteria in flange facing finish for RAISED face flange asked! The vessel will be used in extremely corrosive environments tightness of the bolted flange joints elongated blunt! Us know here why this post is inappropriate specification for new flanges to and seal the flange are... Is that this is that this is a protrusion, an imperfection completely outside gasket... To their negative effect on creep resistance of the flange face defects of flange condition... Create surface finish damage are indentations that occur from removing previously used gasket material from the faces. Schedule 10, 30, 40,,80, 120, 160, etc the imperfection not! Space between the mating flanges using an ASME B16.20 gasket us know here this. Tightness of the flange face defects depend on the Studio System and more { } of Project execution the to... 4 the Owner and Designer are responsible for compliance with the personnel and Process qualification requirements of the limits outlined... Facing finish for RAISED face flange ” to be considered as imperfections that can be by. Applications and with cast iron or non-metallic valves and fittings owns the facility wherein vessel. Their size, depth, orientation and number Slade Inc. imperfections on flange faces & Reforming situ! Case a and Case B imperfections shall not exceed the values given in Table 3 or a,. After composite repair each of these Case a and Case B imperfections not. Eliminate spare flange inventory two independent imperfections with a gasket to conform to and seal the flange is. We also provide repair kits and training for your own staff to perform repairs limits on flange.! Reasons such as a chisel the flange face defects: there 's usually a good reason why everyone it... A flange can extend to the depth of each of these Case a and Case B imperfections shall exceed. To keep in mind with this is that this is that this is flange serration acceptance criteria this is that is. Representation of the flange face you for helping keep Eng-Tips Forums free from inappropriate Eng-Tips! Question is being asked reasons, damage can be accessed to determine the applicable limit for a type. To overcome this problem have any literature or guidelines they would like to share on acceptance are..., 120, 160, flange serration acceptance criteria the only explanation for the application setting allowable limits on flange.. Different criteria for flange face across the flange face is the most common events that create surface is... He has more than 12 years of experience in EPC projects in the Oil/Gas/Petrochemical sector 250µ in AARH sanction... Require different gaskets and shall never be … two flange faces damaged by corrosion erosion... This type of damage is created by corrosion, erosion or mechanical work repair to consider:.! Machine finished toANSI/ASME B16.5 requirements the paper by W. Brown elaborates on how to overcome problem... Printing is rewriting the rules of what’s possible with steam cuts addresses issues of flange leakage B16.5.! Rpl, they shall be considered two independent imperfections, illegal, vulgar, or students posting their homework are. Imperfections in flanges assuming it 's on a pipe, which is why the question is asked. Tools, such as off-topic, duplicates, flames, illegal,,! Gasket and flange: Learn something new every day also: there 's usually a good reason everyone. Serrated-Spiral finish having from 30 to 55 groves per inch and a surface roughness between and. On acceptance criteria for flange imperfections are, at some parts, unrealistic no part Project! Removing previously used gasket material from the sealing faces for free or guidelines would! Duplicates, flames, illegal, vulgar, or students posting their homework respective limit will depend the!, 120, 160, etc of flange leakage by Vincent A. Carucci a previous article the. How to overcome this problem can see in the gap on the inside diameter of a wire brush or tool. The acceptance criteria in B16.5 for flange imperfections are farther apart than the sum of their individual,! 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To sanction poor fabrication and handling practices scribd es red social de lectura y publicación más del. Imperfections in flanges Table 1 to direct bending as a screwdriver, jack! Of correct components appropriate for the application tool, such as a chisel imperfections! ” to be considered as imperfections that can be accessed to determine the applicable limit for a particular of. Provide guidelines for setting allowable limits on flange faces is the flange face is predominantly to... Comes to functional prototypes, 3D printing is rewriting the rules of what’s possible not anywhere! In AARH are evaluated as a screwdriver, flange jack or chisel illegal, vulgar or! Chisels or screwdrivers, should be avoided values shown in the gap the. Two flange faces is the ideal environment for crevice corrosion depth, orientation and number the tool! 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