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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The Committee Pages can be found at http: Size px x x x x Evaluations shall be carried out consistent with the wsme described in the following steps: Corrosion may occur with a circumferential orientation, e. Minichiello, Bechtel National, Inc. While each method can be applied as presented, source documents may provide additional information to the user. Linear interpolation of strength values is allowed between listed temperatures.

Evaluation of individual deep pits within a generally corroded area should account for the effect of wall loss due to general corrosion.

There is no single safety factor that is suitable for all types of pipeline construction, for all modes of pipeline operation, or for all types of flaws or anomalies. Flenner, Flenner Engineering Services J. Depth, d, mm 8. The B31 Standards Committee regularly holds meetings, which are open to asms public. The tables were designed to provide a minimum factor of safety of 1.

Beyer, Fluor Enterprises, Inc. Nominal Wall Thickness tp: If using a grid pattern, the analysis must be repeated along each meridian to establish the governing solution.

Information as to whether or ame technical inquiries are issued to this code or standard is shown on the copyright page. The level 0 assessment calculates the allowable defect length from the maximum defect depth. Holbrook, Babcock Power, Inc. Also, the combination of hoop stress due to internal pressure and longitudinal compression could interact to lower the failure pressure in the metal loss area.


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. Tatar, FM Global K. 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.

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“ASME B31G” Piping Code Enhancements for AutoPIPE

Depth, d, mm 0. Correspondence With the B31 Committee.

High longitudinal stresses in tension acting on metal loss having a significant circumferential extent, in unrestrained piping, could change the failure mode from longitudinal to circumferential.

Upon request, the B31 Standards Committee will render an interpretation of any requirement of the Standard. Same as in para. Further references may be found in other documents available in the public domain. User Defined Outside Diameter schedtype: The user is cautioned against overstating the precision of evaluations applied with flaw dimensions indicated by inline inspection without adequate calibration or verification of actual flaw sizes by investigations carried out in the field.

When calculating the failure stress SFis t the corroded pipe wall thickness? It is applicable to all pipelines and piping systems within the scope of the transportation pipeline codes that are part of ASME B31 Code for Pressure Piping, namely: Correspondence should be addressed to: Wall Thickness Fabrication Fraction.

The tables may be used to determine the maximum allowable longitudinal extent of a contiguous area of corrosion or an interacting cluster of metal loss areas. Sperko, Sperko Engineering Services, Inc. Wall Thickness Fabrication Tolerance Type tfu: Cite the applicable edition of the Standard for which the interpretation is being requested.


Evaluation of the circumferential extent of corrosion subject 1. Silvia, Process Engineers and Constructors, Inc.

ASME B31G – Free Download PDF

They provide b331g ready reference of maximum corrosion lengths for a range adme pipe sizes and depths of corrosion. Bodenhamer, Enterprise Products Co. Validation may be demonstrated by comparison of calculated results against published benchmark test data such as that found in the above reference, or against results produced by another recognized evaluation method that have been calculated in accordance with this Standard.

If the helical pattern lies at an angle less than 45 deg to the pipe axis, the overall length of the corroded area indicated as L1 in Fig. Select an evaluation method and calculate the estimated failure stress, SF. Approved revisions will be published periodically. The value, L, found at the intersection of the wall thickness column and b31h depth row is the maximum allowable longitudinal extent of such a corroded area.

It is the responsibility of the user to determine unitary conversion factors as may be required. Clean the corroded pipe surface to bare metal. Corrosion may occur such that multiple areas of metal loss are closely spaced longitudinally or transversely. In some instances, a review of the interpretation revealed a need for corrections of a technical nature.

ASME procedures provide for reconsideration of these interpretations when or if additional information is available which the inquirer believes might affect the interpretation. We are a non-profit group that run this website to share documents. These replies are taken verbatim from the original letters, except for a few typographical and editorial corrections made for the purpose of improved clarity.

In addition, the following considerations apply: