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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We are a non-profit group that run this website to share documents. The local solution resulting in the lowest calculated failure stress shall govern. For submerged pipelines, or to calculate the allowable pressure at a reference elevation, use the level 1 and level 2 calculators including elevation.

This can increase the reassessment interval to the next inline inspection. Not all methods give identical numerical results or consistent n31g of conservatism. There is an option available to automatically receive an e-mail notification when errata are posted to a particular code or standard.

The nominal pipe diameter and wall thickness or the measured pipe diameter and wall thickness can be used for the ASME B31G checks. Changes given below are identified on the pages by a margin note, 12placed next to the affected area. Minimum Wall Thickness tn: 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.


Holbrook, Babcock Power, Inc.

[Pipeline Corrosion Assessment] – ASME B31G Compliance | Creaform

Requests for Cases should also indicate the applicable edition s of the standard to which the proposed Case applies. In the case where an interpretation is corrected by errata, the original interpretation number with the suffix E is used.

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. Care should be exercised when grouping or clustering anomalies indicated by inline inspection for purposes of evaluating interaction during the prioritization process.

The B31G document provided pipeline operators with a simplified evaluation method based on the results of analysis and tests. Participation by 3b1g agency representative s or person s affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard. Pressure Design Wall Thickness xf: Care should be taken when cleaning corroded areas of a pressurized pipe. The following guideline is suggested with reference to Fig.

A Level 2 evaluation may be suitable for use in prioritizing metal-loss anomalies asm by high-resolution inline inspection. Metal-loss corrosion anomalies indicated by inline inspection may be evaluated by a Level 1 asem Level 2 evaluation method. 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.

For a corroded profile defined by n measurements of depth of corrosion including the end points at nominally full wall thickness, n! Paulin, Paulin Research Group R.

Incorporation of these other methods into a recognized Code document provides the pipeline operator or other user with a formalized framework within which to use such methodologies, as well as a wider range of codified technical options ame which to make an evaluation.


It is not a property specified in a material grade or finished product standard. For crack type defects the NG crack defect calculators are recommended. When calculating h31g hoop stress SO or Shis t in this case the corroded pipe wall thickness? It shall be evaluated for safe operating pressure as with corrosion having a helical angle greater than 45 deg to the pipe axis. A Level 1 evaluation is also suitable for use in prioritizing metal-loss anomalies identified by inline inspection.

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.

Wall Thickness Fabrication Allowance tm: In these cases, a revised reply bearing the original interpretation number with the suffix R is presented. It is noted that Sflow was defined as 1.

ASME B31G-2012

When evaluating anomalies identified by inline inspection, use of larger factors of safety will result in smaller flaws being left in service following field investigation and pipeline repairs. It is the responsibility of the user to determine unitary conversion factors as may be required.

Linear interpolation of strength values is allowed between listed temperatures.