By Edward B. Clark, W.E. Amend
This consultant describes a whole approach for carrying out box hardness trying out to estimate the yield power of pipeline steels. the method is non-destructive so it really is compatible for in-situ checking out on working pipelines, at pipe garage amenities, or a number of different destinations. It additionally permits approach adaptations which are appropriate for software in several events and stipulations which may be encountered on a pipeline right-of-way and somewhere else. box hardness trying out isn't really a 'one dimension suits all' technique the place a unmarried hardness trying out method is acceptable for program in all events that may be encountered
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Additional info for Applications guide for determining the yield strength of in-service pipe by hardness evaluation : final report
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. The sample size determined applies to each homogeneous lot (uniform attributes) of pipe in the population identified by the pre-assessment process. In the event a small lot of pipe is identified that is less than the required sample size, then each pipe length must be subjected to testing.
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. 11. 1 Pipe Manufacturing Aspects No single pipe length can be considered as a totally homogeneous “unit” with respect to its yield or tensile strength and related hardness levels. Variations occur from end-to-end and side-to-side within a given pipe length.
PROCEDURE QUALIFICATION AND DOCUMENTATION In order to minimize possible errors resulting from a hardness testing, detailed procedure(s) must be established, written and qualified to demonstrate that the proposed test methodology will produce hardness values that can be reliably converted to yield strength values. Such procedures will assure test uniformity and consistency thereby reducing the potential uncertainty of the resulting yield strength estimates. All procedures must be prepared and qualified prior to the start of field hardness testing and copies must be provided to the project staff and test technicians.