By Edward B. Clark, W.E. Amend
This consultant describes a whole strategy for engaging in box hardness checking out to estimate the yield power of pipeline steels. the method is non-destructive so it's appropriate for in-situ trying out on working pipelines, at pipe garage amenities, or a variety of different destinations. It additionally enables approach diversifications which are compatible for software in several occasions and prerequisites which may be encountered on a pipeline right-of-way and in other places. box hardness checking out isn't really a 'one measurement matches all' technique the place a unmarried hardness trying out method is acceptable for software in all events that may be encountered.
Read or Download Applications Guide for Determining the Yield Strength of In-service Pipe by Hardness Evaluation: Final Report (CRTD Center for Research and Technology Development) PDF
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Extra resources for Applications Guide for Determining the Yield Strength of In-service Pipe by Hardness Evaluation: Final Report (CRTD Center for Research and Technology Development)
Given such an outcome, it is unlikely that any attempt to conduct a hardness testing evaluation that includes statistical sampling would produce satisfactory results. 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.
Then a list of uniform random numbers equal to the sample size from the total number of pipe lengths in the homogeneous lot is created. This can be accomplished from lists of uniform random numbers commonly found in statistics related books, mathematical tables, statistical software, and can also be generated using spreadsheet software. Since pipe access issues may or other unanticipated problems may arise during excavation, alternate pipe lengths should also be identified. This may include designated alternate random pipe length numbers or pipe lengths adjacent to the original selection.
G) Calibration and verification of proper operation of field hardness testing equipment. h) Perform field hardness testing in various circumferential positions. i) Capable of performing hardness test result calculations for in-process validation assessment. In addition to tasks a-i above, the test technician or another individual familiar with the following field techniques may be required to augment the pre-assessment process. Such methods will aid in establishing the uniformity of a proposed pipe sampling lot, particularly if the available documentation is incomplete or missing.