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Title: Method for establishing hydrostatic re-test intervals for pipelines with stress-corrosion cracking
Category: Pigsource Papers
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: pg3450
Date of Publication: Feb 1 2007 12:00AM
Price: $25.00 US
Authors: Dr Ray Fessler and Steve Rapp
Abstract: This paper describes a model [1] for determining hydrostatic re-test intervals based just upon what is known about the pipeline: the hydrostatic-test history (pressures and dates) and the range of tensile properties of the steel, which can be obtained from mill records. The model addresses the intervals after the second hydrostatic test; it does not specifically treat the first interval. It also considers only ruptures; it does not consider leaks. The model is applicable to high-pH SCC and near-neutral-pH SCC. In fact, it is not necessary to know which type of SCC is on the pipeline. The assumptions upon which the model is based have been verified by comparing its predictions against the field experience of a number of pipeline companies that have conducted multiple hydrostatic tests on pipelines that contained stress-corrosion cracks.

This paper also describes approaches for establishing re-assessment intervals for ILI and SCC DA. Some of those approaches are extensions of the hydrostatic re-test interval model and others are independent of it.

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