It is applicable to all pipelines and piping systems within the scope of: ASME B 4 – Pipeline Transportation Systems for Liquid. Hydrocarbons and Other. ASME B31G – Level 2 Option, otherwise known as RSTRENG is most commonly used in the pipeline industry. However, ASME B31G Level 2 that is based on. Integration with NDT tools. ▫ 3D surface measurements. ▫ UT. ▫ What’s next? ▫ Pit gage data entry interface. ▫ ASME B31G (), DNV RP-F
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Rinaca, Dominion Resources, Inc. A Level 2 evaluation may be suitable for use in prioritizing metal-loss anomalies identified by high-resolution inline inspection.
Diameter Over Aame Thickness Ratio tf: Statistical representations of material properties may be used with Levels 1, 2, or 3 for purpose of establishing a probability h31g failure; however, the details of such analyses are outside the scope of this document.
Corrosion may occur such that multiple areas of metal loss are closely spaced longitudinally or transversely. Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility. Please fill this form, we will try to respond as soon as possible.
B31f issues written replies to inquiries concerning interpretations of technical aspects of this Manual.
When calculating the hoop stress SO or Shis t in this case the corroded pipe wall thickness? Tatar, FM Global K. Therefore, the tables may show that a given corroded area is unsuitable for the current 2. If spaced sufficiently closely, the metal loss areas may interact so as to result in failure at a lower pressure than would be expected based on asem analysis of the separate flaws.
Determine applicable pipe material properties from appropriate records. Pipe Outside Circumference OD: The tables are carried over without change from previous editions of B31G and have been supplemented by the addition of tables in metric units. Errata to codes and standards may be posted on the ASME Web site under azme Committee Pages to provide corrections to incorrectly published items, or to correct typographical or grammatical errors in codes and standards.
Wall Thickness Fabrication Fraction. Wall Thickness Fabrication Allowance tm: Similar issues should be considered in developing a suitable safety factor as were described for a Level 1 or Level 2 analysis. They provide a ready reference of maximum corrosion lengths for a range of pipe sizes and depths of corrosion.
Campbell, Air Liquide J. The application of B31G has enabled pipeline operators to reliably determine safe operating pressure levels for pipe affected by corrosion, and to determine whether repairs are necessary in order to continue operating safely. Approved revisions will be published periodically. Cases may be issued for the purpose of providing alternative rules when justified, to permit early implementation of an approved revision when the need is urgent, or to provide rules not covered by existing provisions.
Sflow shall not exceed SMTS. Changes given below are identified on the pages by a margin note, 12placed next to the affected area. They were calculated from the equations for a Level 1 evaluation in accordance with the original B31G methodology. Consideration should be given to minimum thresholds of metal loss for reliable detection and sizing, minimum thresholds for reporting, and the expected mode of coating failure e. Select an evaluation method and calculate the estimated failure stress, SF.
Rodabaugh, Honorary Member, Consultant W. Methods accounting for uncertainty in indirectly sized flaws include increasing the flaw dimension in order to account for detection tool error, or statistical analysis of the probable flaw sizes or risk of failure.
ASME Standards are developed and maintained with the intent to represent the consensus of concerned interests. Evaluation of the circumferential extent of corrosion subject 1. Sperko, Sperko Engineering Services, Inc. These replies are taken verbatim from the original letters, except for a few typographical and editorial corrections made for the purpose of improved clarity.
Size px x x x x For crack type defects the NG crack defect calculators are recommended.
ASME B31G – Free Download PDF
Subsequent revisions to the Manual may have superseded the reply. Correspondence should be addressed to: Where the term pipeline is used, it may also be read to apply to piping or pipe conforming to the acceptable applications and within the technical limitations discussed below.
Thank you for interesting in our services. It is noted that Sflow was defined as 1. Further, persons aggrieved by an interpretation may appeal to the cognizant ASME committee or subcommittee. It is intended that a Level 0 evaluation be conducted in the field without the need for performing detailed calculations. Information as to whether or not technical inquiries are issued to this code or standard is shown on the copyright page.
Determine pipe diameter and nominal wall axme from appropriate records or direct measurement of the pipe.
Cite the applicable paragraph number s and the topic of the inquiry. The level 0 assessment calculates the allowable defect length from the maximum defect depth.
The revision of B31G reflected those objectives. The B31G document provided pipeline operators with a simplified evaluation method based on the results of analysis and tests.
We need your help to maintenance this website. Corrosion may occur with a circumferential orientation, e. Depth, d, mm 0. Care should be taken when cleaning corroded areas of a pressurized pipe. Appleby, ExxonMobil Development Co. September 29, File: Payne, Alstom Power, Inc.