A wide range of machine options are available, including models that can be mounted internally or externally (and, in some cases, both). Will the flange leak if used or should the end user replace it? Each damaged area will tend to create a potential leak path that the gasket must try to seal. Appendix D of the standard includes information that specifically addresses issues of flange surface condition. Only imperfections within the GASKET SEATING WIDTH are evaluated as a rejectable detect. flange face by taking measurements of the defective areas (see Figure 1). 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. The 6 available types of flange face are flat (FF), raised (RF), ring joint (RTJ), lap joint, male and female (M&F), tongue and groove (T&G). 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 Over time, the corrosion started in the gap on the inside diameter of a flange can extend to the gasket area. Serration on the Flange Face. A brass wire brush is preferred. His interests include pipeline system cleanliness and loss prevention in LNG liquefaction facilities as part of project execution. 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 flange face is predominantly prone to crevice corrosion when flanges are used in extremely corrosive environments. The respective limit will depend on the type and category of gasket being used in the bolted flange connection. Imperfections on flange faces happen. Flange Dimension Tolerances, Dimension Table, ASME B16.5 Flanges. Instrument to measure flange face serration Showing 1-4 of 4 messages Instrument to measure flange face serration Hrishi 5/30/12 2:59 AM Hi I need following precise information urgently.. Frequently, this type of damage is created by a sharp object dragging across the flange face. 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. Scribd es red social de lectura y publicación más importante del mundo. Umm, assuming it's already welded to a piece of pipe, which is why the question is being asked. 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. Removing the corroded flange and welding a new one, 2 The cutting tool empolyed has an approximate 0.06 in. When two adjacent imperfections are farther apart than the sum of their individual RPL, they shall be considered two independent imperfections. He has more than 12 years of experience in EPC projects in the Oil/Gas/Petrochemical sector. The RPL shall include both defects. acceptance is the criteria. 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). If these defects are small and few, the leak tightness of the bolted connection will not be significantly impacted. 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. Questions about Flange face, height, and serrations. Each joint consists of two mating flanges with a gasket material between them, Figure 2. 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. Requirements that are specific to Code, Section VIII, Division 2 are shown in braces { }. Please let us know here why this post is inappropriate. 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. The RPL of the imperfection shall not exceed the values given in Table 3. @2021 - Oilman Magazine, LLC. 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. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. Currently the majority of inspection of flanged joints is undertaken by periodically breaking the flange and visually inspecting the condition of the sealing faces. The flange face has small grooves as you can see in the image. Permissible Imperfections in Flange Face finish. Photo courtesy of Slade Inc. Imperfections on flange faces happen. Banks Industrial Group offers rapid metal repair and reforming of flange faces damaged by corrosion, erosion or mechanical work. LANL Engineering Standards Manual PD342 Chapter 17 Pressure Safety Section D20-B31.3-G, ASME B31.3 Process Piping Guide Rev. 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. 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 RPL and depth of the joined imperfection shall not exceed the values given in Table 3. 3mm is too much to expect a gasket to handle. 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. 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. 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. The RPL and depth of each of these Case A and Case B imperfections shall not exceed the values given in Table 3. 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. I have used different criteria for flange face (gasket surface) damage evaluation at several different refineries throughout the U.S. In general, there are four basic types of repair to consider: 1. Flanges with different faces require different gaskets and shall never be … 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. This standard provides guidance for several important flange considerations. All dimensions are in inches These flanges will be furnished with a 1/16" raised face unless 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. get whoever improperly handled it to provide you with a new one! With these measurements, Table 1 can be accessed to determine the applicable limit for a particular type of damage. If it's new, send it back! 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. 63 AARH : 32 to 63µ in AARH. “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 … Gouges can be caused by objects—such as a screwdriver, flange jack or chisel. 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. 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 Can be deep size, depth, orientation and number by in-place re-facing is what needs to returned! 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From the sealing faces reduce or eliminate spare flange inventory potential leak path that flange serration acceptance criteria can. The above Table only apply with ASME B16.5 and B16.47 flanges using an ASME B16.20 gasket to. B16.47 flanges using cables and rigging this post is inappropriate dents sometimes result from collisions... Accept imperfections in flanges and thesis posting is forbidden surface roughness between 125 500... With ASME B16.5 and B16.47 flanges using cables and rigging you for helping keep Eng-Tips Forums from...
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