1.1 This practice describes procedures to be followed during alternating current (ac) 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 parallel to the thread axis. 1.2 This practice is intended for use on threads in any metallic material. 1.3 This practice does not establish thread acceptance criteria. Typically, industry practice is to reject these connections on detection of a confirmed discontinuity. 1.4 While the ac field measurement technique is capable of detecting discontinuities in these connections, supplemental surface nondestructive testing (NDT) methods such as magnetic particle testing for ferrous metals and penetrant testing for nonferrous 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. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Examinations are currently carried out with no standard practice to refer to. E2261 for weld inspection with ACFM is the closest. Users are providers of drillstring for rental and manufacturers.
Keywordsalternating current field measurement; electromagnetic examination; ferromagnetic material; nonmagnetic material; thread; root; drillstring
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Ballot Item Approved as E2928-2013 and Pending Publication