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Title: A Modified Criterion For Evaluating The Remaining Strength Of Corroded Pipe
Author: J. F. Kiefner, P. H. Vieth
Source: American Gas Association 1990
Year Published: 1990
Abstract: In the late 1960s and early 1970s, a criterion was developed through research sponsored by Texas Eastern Transmission Corporation and the Pipehrie Research Committee of A.G.A, to evaluate the serviceability of corroded pipe. This criterion has been embodied in both the B31.4 and B31.8 pipeline design codes and is described in detail in a separate document: ANSI/ASME B31GI984 Manual for Determining (he Remaining Strength of Corroded Pipelines. The criterion, commonly referred to as the B31G criterion, can be used by a pipeline operator to assess corroded pipe for rehabilitation purposes. The remaining pressurecarrying capacity of a pipe segment is calculated on the basis of the amount and distribution of metal lost to corrosion and the yield strength of the material. If the calculated remaining pressure-carrying capacity exceeds the maximum allowable operating pressure of the pipeline by a sufficient margin of safety, the corroded segment can remain in service. If not, it must be repaired or replaced. Applying this criterion, pipeline operators have saved millions of dollars by not removing corroded pipe that is still fit for service in spite of having sustained some loss of metal. From its inception, the B31G criterion was intended to embody a large factor of safety to protect pipelines from failure. Experience has shown that the amount of conservatism embodied in the criterion is excessive, resulting in the removal or repair of more pipe than is necessary to maintain adequate integrity. Therefore, it is desirable to have a modified criterion that will still preserve adequate pipeline integrity but result in less removal of pipe. A modified criterion that meets this requirement is described in this paper.

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