Title: Piping and Pipeline Pressure Thickness Integrity Calculations
Abstract: The primary issue in pipe design is the minimum wall thickness for pipe sizes when exposed to given temperatures and pressures. To establish that wall thickness the material and its allowable stress at those conditions are the first consideration. There are two ways to choose the basic allowable stress with variations, which are also discussed. If the same material is used and the same service conditions apply, that basic stress may still be different. This comes about because of the different levels of concern for the pipe to be in a safe condition at that service state. There is also some allowance for the level of analysis of the pipe as it is being designed. It is common to discuss the margin between a design, say right at the yield point and at a lower point, by calling that the safety factor, which of course it is, but the level of safety is dependent on the knowledge of the condition one is designing for. That knowledge comes from the certainty that the loads used in the equations are accurate, the allowable stresses are correct, and the method of analysis utilized all of the possible variations in computing the results. So the size of the safety factor can correctly be called a measure of what one doesn't know.
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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