Download PDF by Edward B. Clark, W.E. Amend: Applications guide for determining the yield strength of

By Edward B. Clark, W.E. Amend

ISBN-10: 0791802914

ISBN-13: 9780791802915

This consultant describes an entire procedure for accomplishing box hardness checking out to estimate the yield power of pipeline steels. the method is non-destructive so it's appropriate for in-situ checking out on working pipelines, at pipe garage amenities, or a variety of different destinations. It additionally allows method adaptations which are compatible for software in numerous occasions and stipulations that could be encountered on a pipeline right-of-way and somewhere else. box hardness trying out isn't a 'one measurement suits all' method the place a unmarried hardness checking out method is appropriate for program in all occasions that may be encountered

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Extra resources for Applications guide for determining the yield strength of in-service pipe by hardness evaluation : final report

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2 and Appendix G and apply the succeeding sections. However, familiarity with the background material would provide an improved understanding of the methods used and facilitate application of the methods described. 2 Background The following nomenclature is used in this section: xmin A statistic that is used as a minimum hardness value. Since the hardness values are considered to be normally distributed, this is not a true minimum; rather it is a cutoff for rare events. Specifically, it is rarely expected for values below xmin to occur by chance.

Depending on the particular missing or uncertain data elements, it may be possible to supplement the pre-assessment information obtained from pipeline records by conducting appropriate field non-destructive examinations using the techniques described in Section 5. If it is determined that data generated by such preliminary field evaluations is sufficient to facilitate completion of a comprehensive pre-assessment process, then pipe strength evaluation by hardness testing should be feasible. Since hardness testing requires direct access to the surface to at least some of the pipe lengths to be evaluated, conditions that impede or preclude such access are important feasibility considerations.

This is particularly important for “pencil” type indenters such as UCI probes that may not be equipped with a support ring or stand to facilitate alignment. Proper indenter alignment also becomes more a critical requirement for most tester types with decreasing pipe diameters. Proper pipe curvature support shoes are essential for maintaining correct indenter alignment, particularly on smaller pipe diameters. If any procedure is qualified without a support shoe, it is acceptable to conduct testing with a support shoe but not vice versa.

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Applications guide for determining the yield strength of in-service pipe by hardness evaluation : final report by Edward B. Clark, W.E. Amend

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