By Edward B. Clark, W.E. Amend

This advisor describes a whole strategy for engaging in box hardness checking out to estimate the yield energy 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 quite a few different destinations. It additionally makes it possible for strategy diversifications which are appropriate for program in numerous occasions and stipulations which may be encountered on a pipeline right-of-way and in other places. box hardness checking out isn't really a 'one dimension suits all' technique the place a unmarried hardness trying out technique is appropriate for software in all events that may be encountered

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

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C) Pipe Diameter As pipe diameters increase, it becomes typically less difficult for the test technician to properly conduct field hardness testing. Conversely, hardness testing on smaller diameter pipe increases the testing difficulty. For hardness testing procedure qualification purposes, the following two nominal pipe diameter (D) ranges will be used to establish the procedure qualification range as follows: • • D ≥ 10 inch D ≤ 8 inch Hardness testing procedures qualified for applications on 8 inch diameter or less pipe are considered applicable to all greater pipe diameters.

E) Pipe Hardness Test Location The location along the pipe length and circumferential position of the hardness test should be specified in the procedure. f) Coating Removal/Surface Preparation Sufficient coating area must be removed at each hardness test location to permit an adequate area for indenter support and the required number of tests to be completed. The test surface must be adequately prepared by grinding/sanding to produce a finished surface roughness compatible with the hardness testing method and indentation dimensions.

278. 20 as the minimum HRB estimate. 2. A variation of the preceding example is also shown to illustrate the effect of increasing the chance that the minimum hardness would be less than the minimum value determined. 01 (a 1/100 rate of occurrence by chance). 65 as the minimum HRB estimate. 65. 65. 5 Additional Considerations In addition to determining the sample size estimates and determining the minimum estimated hardness for the population being sampled, additional sampling-related criteria exist that must be considered.

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