ASME B31G:2012 pdf free download

ASME B31G:2012 pdf free download.Manual for Determining the Remaining Strength of Corroded Pipelines.
This document recommends a minimum safety factor equal to the ratio of the minimum hydrostatic test pressure required for the given type of pipeline construction to the MACP or MOP, but usually not less than 1.25. larger factors of safety may be appropriate in some cases, e.g., in locations of greater risk to the public or the environment. Lesser factors of safety may be justified in some circumstances, e.g., for limited periods of time, or where additional procedures are in place to limit modes of operation, or in a remote location having reduced consequences of failure. 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.
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. This can increase the reassessment interval to the next inline inspection.
1.10 Software
The use of commercial or proprietary computer software packages, as well as purpose-written programs or spreadsheets, can greatly facilitate Level 1 evaluations, and is practically a necessity for conducting thorough Level 2 and Level 3 evaluations. It is the user’s responsibility to verify the accuracy and reliability of all software and spreadsheets, and to train personnel in their correct usage.
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. The following document sLimmarizes the results of burst tests and service failures of line pipe affected by corrosion or artificial metal loss, and which have previously been used for the purpose of validating the evaluation methods presented herein: Kiefner, J. F., Vieth, P H., and Roytman, I., “Continued Validation of RSTRENG,” PRCI Catalog No. L51749, Contract PR 218-9304, Dcc. 20, 1996.
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.
Validation of third-party software should also demonstrate that adequate checks or warnings are produced when parameters fall outside ranges that will ensure correct results.