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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In these cases, a revised reply bearing the original interpretation number with the suffix R is presented. Page Location Change 2 1. A majority of these other methods are based on the same theoretical model from which the original B31G method was derived, but may offer some refinement in accuracy. Rinaca, Dominion Resources, Inc. Cite the applicable edition of the Standard for which the interpretation is being requested.
All methods described herein have been demonstrated to provide reliable and conservative results when they are applied correctly and within stated limitations. 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.
Pressure Design Wall Thickness xf: The methods and criteria provided herein do not address circumferential failure due to high longitudinal tensile stresses. All technical inquiries must be submitted in writing to the staff secretary.
ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable letters patent, nor assumes any such liability.
Read across to the column showing the wall thickness of the pipe. Methods employed for clustering of inline inspection anomalies should be validated by field verification of actual flaw dimensions and spacing. The request should identify the standard, the paragraph, figure or table number sand be written as a Question and Reply in the same format as existing Cases. 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.
It is not the intention of this document to prohibit their use, but the user of such methods shall be able to demonstrate that the objective of a safe and reliable assessment of metal loss can be achieved. The metal loss area on the pipe is acceptable if its measured length, L, does not exceed the value of L given in the table. The nominal pipe diameter and wall thickness or the measured pipe diameter and wall thickness can be used for the ASME B31G checks.
Linear interpolation of strength values is allowed between listed temperatures. Size px x x x x Coym, Intertek Moody C. Nominal Wall Thickness tp: Participation by federal agency representative s or person s affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard.
It is intended that a Level 0 evaluation be conducted in the field without the need for performing detailed calculations.
Chin, TransCanada Pipeline U. The methods and criteria provided herein b31gg not address failure by perforation. The tables were designed to provide a minimum factor of safety of 1. Statistical representations of material properties may bb31g used with Levels 1, 2, or 3 for purpose of establishing a probability of failure; however, the details of such analyses are outside the scope of this document.
Please help us to share our service with your friends. The request for an interpretation should be clear and unambiguous. It typically relies on detailed measurements of the corroded surface profile, accounting for the actual distribution of metal loss, and involves repetitive computations that may be facilitated by the use of computer software or spreadsheets. Further, persons aggrieved by an interpretation may appeal to the cognizant ASME committee or subcommittee.
User N31g Outside Diameter schedtype: Increments of measurement need not be uniform, subject to limitations of application software. It is intended that a Level 2 evaluation axme conducted by an engineer or technician xsme appropriate training.
ASME B31G – Free Download PDF
We need your help to maintenance this website. Clean the corroded pipe surface to bare metal. ASME Standards are developed and maintained with the intent to represent the consensus of concerned interests. Flenner, Flenner Engineering Services J.
Simply mail, phone, fax, or E-mail us and a Customer Care representative will handle your request. Evaluation of individual deep pits within a generally bb31g area should account for the effect of wall loss due to general corrosion.
Rodabaugh, Honorary Member, Consultant W. In the table, locate the row showing a depth equal to the measured maximum depth of the corroded area.
Evaluation of the circumferential extent of corrosion subject 1. The allowable reference pressure is calculated from the local allowable pressure, and the relative elevation.
Bb31g, Process Engineers and Constructors, Inc. The revision of B31G reflected those objectives. Ssme flow stress can be calculated as either 1. Errata to codes and standards may be posted on the ASME Web site under the Committee Pages to provide corrections to incorrectly published items, or to correct typographical or grammatical errors in codes and standards. In establishing the safety factor for a given pipeline segment, the pipeline operator shall give consideration to the accuracy of corrosion depth and length measurements, rates of corrosion growth, the characteristics of the pipe, the reliability of surge control or excess pressure limiting methods, and the presence of external factors that affect risk.
Soni, Delegate, Engineers India Ltd. Requests for Cases should also indicate the applicable edition s of the standard to which the proposed Case applies. Larger factors of safety may be appropriate in some cases, e. The Effective Area Method is expressed as asmd