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Significance and Use
5.1 The purpose of the alternating current field measurement method is to evaluate threads for surface breaking discontinuities such as fatigue cracks running along the thread root. The examination results may then be used to determine the fate of the tool. This may involve re-examination by an alternative technique, immediate scrapping of the tool, or reworking to remove discontinuities (beyond the scope of this practice). This practice is not intended for the examination of threads for non-surface breaking discontinuities.
1.1 This practice describes procedures to be followed during alternating current field measurement examination of drillstring threads on tubulars used for oil and gas exploration and production for detection and, if required, sizing of service-induced surface breaking discontinuities transverse to the pipe.
1.4 While the alternating current field measurement technique is capable of detecting discontinuities in these connections, supplemental surface NDT methods such as magnetic particle testing for ferrous metals and penetrant testing for non-ferrous metals may detect more discontinuities.
1.5 Units—The values stated in either inch-pound units or SI units are to be regarded separately as standard. The values stated in each system might not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
E543 Specification for Agencies Performing Nondestructive Testing
E1316 Terminology for Nondestructive Examinations
E2216 Guide for Evaluating Disposal Options for Concrete from Nuclear Facility Decommissioning
ICS Number Code 75.180.10 (Exploratory, drilling and extraction equipment)
UNSPSC Code 20111500(Drilling and exploration equipment)
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ASTM E2928 / E2928M-13, Standard Practice for Examination of Drillstring Threads Using the Alternating Current Field Measurement Technique, ASTM International, West Conshohocken, PA, 2013, www.astm.orgBack to Top