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B31g Criterion

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J.f. Kiefner – One of the best experts on this subject based on the ideXlab platform.

  • Continued validation of RSTRENG. Final report
    , 1996
    Co-Authors: J.f. Kiefner, P.h. Vieth, I Roytman

    Abstract:

    The purpose of this project was to obtain and analyze new information on the behavior of corroded pipe that would address the validity of RSTRENG. RSTRENG is the PC software which the pipeline industry intends to use to evaluate the remaining strength of corroded pipe. RSTRENG is an enhancement of the existing ASME B31g Criterion that the industry presently relies upon. RSTRENG was developed on a prior PRC-sponsored project and its validity already has been demonstrated to a significant degree on the basis of 86 burst tests of corroded pipe and pipe samples containing corrosion-simulating flaws. Nevertheless, a continuing validation effort is justified because of some postulated limitations of the methodology and because of the critical importance of the adequacy of the entire concept of declaring a corroded pipeline to be serviceable by assessing its remaining strength. Since the initial release of the RSTRENG software, work on evaluating the behavior of corroded pipe has continued along several lines. Some of the continuing work has produced additional experimental data on the behavior of corroded pipe. This report addresses the significance of these additional data with respect to the RSTRENG methodology. In addition, the authors have continued to collect and analyze datamore » from corrosion-caused service and hydrostatic test failures to add to the A.G.A./PRC “Database of Corroded Pipe Tests.“ These new data are analyzed herein and their impact on the RSTRENG methodology is assessed. For all calculations, the new RSTRENG2 has been used.« less

  • Database of corroded pipe tests. Final report
    , 1994
    Co-Authors: P.h. Vieth, J.f. Kiefner

    Abstract:

    The remaining strength of corroded pipe is an important consideration in the operation and maintenance of high-pressure cross-county pipelines. In that pipeline replacement is extremely costly, pipeline operators need to avoid replacing pipe that, though corroded, is still fit for service. For over 20 years, the pipeline industry has relied upon a simple, reliable semi-empirical equation for predicting the remaining pressure-carrying capacity of corroded pipe. This equation is embodied in an industry-accepted standard, the ASME B31g Guidelines. The basis for the guidelines is found in past research sponsored by the Pipeline Research Committee (PRC) of A.G.A. The final acceptance of the B31g Criterion by the industry was based largely on the results of 47 burst tests of corroded pipe presented. More recently, another PRC-sponsored study has resulted in an enhanced version of the basic B31g equation and the addition of 39 additional burst-test results. The growing use of the B31g Criterion and the confidence engendered by the burst-test results has led to the generation of an enhanced database described in this document. The database contains 124 results of tests on corroded pipe or pipe containing corrosion-simulating defects. The purpose of the database is to provide additional test data on themore » behavior of corroded pipe. These data will enable researchers and pipeline operators to confirm the margin of safety in the B31g Criterion and to continue in their efforts to develop more general theories to describe the failure behavior of corroded pipe. This document describes the 124 experiments and presents the essential results. It also describes what additional information, too detailed to include herein, is available upon request. A description of how to perform a corroded pipe burst test is presented for those who wish to generate additional data.« less

  • EVALUATING CORRODED PIPE–CONCLUSION: PRESSURE CALCULATION FOR CORRODED PIPE DEVELOPED
    Oil & Gas Journal, 1992
    Co-Authors: T J O'grady, D T Hisey, J.f. Kiefner

    Abstract:

    ARCO Alaska Inc. has developed a method for determining the maximum allowable operating pressure in a corroded pipeline. This method incorporates modifications of the ASME/ANSI B31g Criterion to correct for its being overly conservative. The method is based on procedures–outlined in Part 1 of this series (OGJ, Oct. 12, pp 77-78, 80-82)–which allow evaluation of large areas of metal loss, corrosion in some welds, groups of noncontinuous pits and, to a limited extent, the effect of circumferential corrosion. The method is examined in detail in this article.

T J O'grady – One of the best experts on this subject based on the ideXlab platform.

  • EVALUATING CORRODED PIPE–CONCLUSION: PRESSURE CALCULATION FOR CORRODED PIPE DEVELOPED
    Oil & Gas Journal, 1992
    Co-Authors: T J O'grady, D T Hisey, J.f. Kiefner

    Abstract:

    ARCO Alaska Inc. has developed a method for determining the maximum allowable operating pressure in a corroded pipeline. This method incorporates modifications of the ASME/ANSI B31g Criterion to correct for its being overly conservative. The method is based on procedures–outlined in Part 1 of this series (OGJ, Oct. 12, pp 77-78, 80-82)–which allow evaluation of large areas of metal loss, corrosion in some welds, groups of noncontinuous pits and, to a limited extent, the effect of circumferential corrosion. The method is examined in detail in this article.

  • Method for evaluating corroded pipe addresses variety of patterns
    Oil & Gas Journal, 1992
    Co-Authors: T J O'grady, D T Hisey, J.f. Kiefner

    Abstract:

    This paper reports that ARCO Alaska Inc. has developed a method for evaluating corroded pipelines which includes and expands upon criteria embodied in the ASME/ANSI B31g Guide for the Evaluation of the Remaining Strength of Corroded Pipe. This method permits evaluation of large areas of metal loss, corrosion in some welds, groups of noncontinuous pits and, to a limited extent, the effect of circumferential corrosion. The B31g approach, on the other hand, deals with the effect of single arrays of pitting on the pressure-carrying capacity of the pipe. The method includes the Modified B31g Criterion developed for the AGA pipeline Research Committee. An objective of Battelle’s work was to address the built-in conservatism of B31g.

  • EVALUATING CORRODED PIPE–1: METHOD FOR EVALUATING CORRODED PIPE ADDRESSES VARIETY OF PATTERNS
    Oil & Gas Journal, 1992
    Co-Authors: T J O'grady, D T Hisey, J.f. Kiefner

    Abstract:

    ARCO Alaska Inc. has developed a method for evaluating corroded pipelines which includes and expands upon criteria embodied in the ASME/ANSI B31g “Guide for the Evaluation of the Remaining Strength of Corroded Pipe.” This method permits evaluation of large areas of metal loss, corrosion in some welds, groups of noncontinuous pits and, to a limited extent, the effect of circumferential corrosion. The B31g approach, on the other hand, deals with the effect of single arrays of pitting on the pressure-carrying capacity of the pipe. The method includes the “Modified B31g Criterion” developed by Battelle Columbus for the AGA Pipeline Research Committee. An objective of Battelle’s work was to address the built-in conservatism of B31g. This first of two articles sets forth the criteria and procedures for evaluating metal loss. The conclusion will present a method for determining the safe operating pressure for corroded pipe.

D T Hisey – One of the best experts on this subject based on the ideXlab platform.

  • EVALUATING CORRODED PIPE–CONCLUSION: PRESSURE CALCULATION FOR CORRODED PIPE DEVELOPED
    Oil & Gas Journal, 1992
    Co-Authors: T J O'grady, D T Hisey, J.f. Kiefner

    Abstract:

    ARCO Alaska Inc. has developed a method for determining the maximum allowable operating pressure in a corroded pipeline. This method incorporates modifications of the ASME/ANSI B31g Criterion to correct for its being overly conservative. The method is based on procedures–outlined in Part 1 of this series (OGJ, Oct. 12, pp 77-78, 80-82)–which allow evaluation of large areas of metal loss, corrosion in some welds, groups of noncontinuous pits and, to a limited extent, the effect of circumferential corrosion. The method is examined in detail in this article.

  • Method for evaluating corroded pipe addresses variety of patterns
    Oil & Gas Journal, 1992
    Co-Authors: T J O'grady, D T Hisey, J.f. Kiefner

    Abstract:

    This paper reports that ARCO Alaska Inc. has developed a method for evaluating corroded pipelines which includes and expands upon criteria embodied in the ASME/ANSI B31g Guide for the Evaluation of the Remaining Strength of Corroded Pipe. This method permits evaluation of large areas of metal loss, corrosion in some welds, groups of noncontinuous pits and, to a limited extent, the effect of circumferential corrosion. The B31g approach, on the other hand, deals with the effect of single arrays of pitting on the pressure-carrying capacity of the pipe. The method includes the Modified B31g Criterion developed for the AGA pipeline Research Committee. An objective of Battelle’s work was to address the built-in conservatism of B31g.

  • EVALUATING CORRODED PIPE–1: METHOD FOR EVALUATING CORRODED PIPE ADDRESSES VARIETY OF PATTERNS
    Oil & Gas Journal, 1992
    Co-Authors: T J O'grady, D T Hisey, J.f. Kiefner

    Abstract:

    ARCO Alaska Inc. has developed a method for evaluating corroded pipelines which includes and expands upon criteria embodied in the ASME/ANSI B31g “Guide for the Evaluation of the Remaining Strength of Corroded Pipe.” This method permits evaluation of large areas of metal loss, corrosion in some welds, groups of noncontinuous pits and, to a limited extent, the effect of circumferential corrosion. The B31g approach, on the other hand, deals with the effect of single arrays of pitting on the pressure-carrying capacity of the pipe. The method includes the “Modified B31g Criterion” developed by Battelle Columbus for the AGA Pipeline Research Committee. An objective of Battelle’s work was to address the built-in conservatism of B31g. This first of two articles sets forth the criteria and procedures for evaluating metal loss. The conclusion will present a method for determining the safe operating pressure for corroded pipe.