By Edward B. Clark, W.E. Amend
This advisor describes a whole approach for accomplishing box hardness checking out to estimate the yield energy of pipeline steels. the method is non-destructive so it's compatible for in-situ trying out on working pipelines, at pipe garage amenities, or quite a few different destinations. It additionally makes it possible for technique diversifications which are compatible for program in numerous events and prerequisites which may be encountered on a pipeline right-of-way and in other places. box hardness trying out isn't a 'one measurement suits all' method the place a unmarried hardness trying out technique is acceptable for program in all occasions that may be encountered.
Read Online 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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Additional info for Applications Guide for Determining the Yield Strength of In-service Pipe by Hardness Evaluation: Final Report (CRTD Center for Research and Technology Development)
001 that the subtraction factor applied in Equation 8 is very large for small values of N and slowly decreases for larger values of N with an optimum range of about 7-16. org/about-asme/terms-of-use range that also has the effect of minimizing the subtraction factor. 001) of the time, the minimum hardness result in any pipe length would not be less than a certain value which is described in the following example. Example 2: Minimum Hardness Value Estimate Example: Consider the following HRB hardness test results on six pipe lengths from a population being evaluated.
Test technician qualification shall consist of demonstrating the ability to: 1. Verify the proper operation of the hardness testing instrument according to the manufacturer’s instructions. 2. Calibrate the hardness testing instrument using a standard hardness reference block. 3. Produce hardness test results that are within + 2% and – 4% 7of the value measured in a standard laboratory hardness test after applying applicable correction factors to 7 Tolerance based on author’s field testing experience and relevant industry hardness testing standards.
If the difference between the average field and laboratory results is within the limits stated in the PQR, the procedure is considered to be properly qualified. The test technician conducting the tests should also be considered as qualified to perform field hardness testing within the procedure qualification range. 9. 1 PROJECT STAFF/TEST TECHNICIAN QUALIFICATION REQUIREMENTS Required Skills It is essential that each of the following tasks be properly performed to ensure that field hardness testing is conducted in accordance with the requirements and the hardness testing procedures qualified in accordance with Section 8 of this Guide.