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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When calculating the hoop stress SO or Shis t asmf this case the corroded pipe wall thickness? 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. Validation of software should include documented evidence that correct results are obtained over the full range of parameters that could reasonably be expected to occur when making evaluations.

If known with confidence, the actual uncorroded wall thickness may be used with a Level 1, Level 2, or Level 3 evaluation, with a suitable adjustment of the hoop stress due to internal pressure. When calculating the failure stress SFis t the corroded pipe wall thickness?

The Effective Area Method is expressed as follows: Frikken, Becht Engineering Co. B31J Pipeline Personnel Qualification. The B31 Standards Committee regularly holds meetings, which are open to the public. Statistical representations of material properties may be used with Levels 1, 2, or 3 for purpose of establishing a probability of failure; b31gg, the details of such analyses are outside the scope of this document.


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.

“ASME B31G” Piping Code Enhancements for AutoPIPE

It is intended that a Level 3 evaluation be conducted by a technical specialist having appropriate expertise in the subject of fitness-for-service assessment. In some instances, a review of the interpretation revealed a need for corrections of a technical nature.

In the table, locate the row showing a depth equal to the measured maximum depth of the corroded area. Methods accounting for uncertainty bb31g 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.

Wall Thickness B31y Allowance tm: 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. Determine pipe diameter and nominal wall thickness from appropriate records or direct measurement of the pipe. User Defined Outside Diameter schedtype: It is intended that a Level 0 evaluation be conducted in the field without the need for performing detailed calculations.


“ASME B31G” Piping Code Enhancements for AutoPIPE – AutoPIPE Wiki – AutoPIPE – Bentley Communities

ASME Standards are developed and maintained with the intent to represent the consensus of concerned interests. Corrosion may occur such that multiple areas of metal loss are closely spaced longitudinally or transversely. Minichiello, Bechtel National, Inc. Tatar, FM Global K.

In the case where an interpretation is corrected by errata, the original interpretation number with b31y suffix E is used. Chin, TransCanada Pipeline U.

The level 2 assessment calculates the allowable pressure from the defect “river bottom” profile using the effective area method also known as the RSTRENG method.

ASME B31G Pipe Corrosion Calculation

Noninteracting flaws should be evaluated as separate flaws. There is an option available to automatically receive an e-mail notification when errata are posted to a particular code or standard.

We need your help! October 24, The next edition of this Manual is scheduled for publication in Depth, d, mm 0. Not all methods give identical numerical results or consistent degrees of conservatism. The methods and criteria provided herein do not address buckling or wrinkling, or interaction of hoop stress with longitudinal compressive stresses.

Material specific test data should be used if it is available.