Issue << content << Magnetic Nondestructive Testing: Metrological Parameters Evaluation


DOI: 10.12737/13529

2015. Vol.18. No. 4, pp. 65-70

Magnetic Nondestructive Testing: Metrological Parameters Evaluation

V. V. Sukhorukov

Metrology is very important for nondestructive testing. The accurate evaluation of NDT instruments and technologies metrological parameters is а problem. It should be taken into consideration that the parameters (such as accuracy, threshold of sensitivity etc.) stated in the delivery documentation can differ significantly from those when the instruments and technologies are used in practice. If this difference is not taken into account, testing results can be substantially worse than they had been expected. The NDT technicians must be qualified enough to avoid this. Requirements for personnel skills are now included in the standards and norms on NDT technologies for concrete objects. Personnel qualification requirements regarding to NDT of steel wire ropes are now under consideration. Unfortunately, technicians do not always meet the requirements. This applies to almost all NDT methods and devices but especially to electromagnetic and magnetic flow leakage methods when they are used for testing of ferromagnetic objects, such as steel wire ropes, steel-cord conveyor belts, tubes, oil and gas tanks. The paper can be useful for NDT specialists in their practice of ferromagnetic objects testing, particularly of steel wire ropes.
 
Keywords: metrology, magnetic inspection, threshold of sensitivity, signal-to-noise ratio, steel wire rope, MFL testing
References
1. Sukhorukov V. V., Vainberg E. I., Kazhis R.-Y. Yu., Abakumov A. A. Introskopiya i avtomatizatsiya nerazrushayushchego kontrolya [Introscopy and automation of nondestructive testing].  In: Nerazrushayushchiy kontrol [Nondestructive testing: Practical guide, part 5]. Moscow, Vyssh. shk. Publ., 1993, 329 p. (in Russ.).
2. RD 03-348-00. Metodicheskie ukazaniya po magnitnoy defektoskopii stalnykh kanatov gruzopodemnykh kranov [Guidelines for magnetic flaw detection of hoisting crane steel wire ropes]. In: PB 10-382-00. Pravila ustroystva i bezopasnoy ekspluatatsii gruzopodemnykh kranov [Rules for arrangement and safety operation of hoisting cranes: ser. 10, iss. 7]. Moscow, «Promyshlennaya bezopasnost» Publ., 2009, pp. 264-283 (in Russ.).
3. ASTM, ASTM E 1571-11: Standard Practice for Electromagnetic Examination of Ferromagnetic Steel Wire Rope. ASTM Book of Standards, V. 03.03. West Conshohocken, Pennsylvania, ASTM Int., 2011.
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5. Sukhorukov V. V. MFL Technology for Diagnostics and Prediction of Object Condition. In: The 12th Int. Conf. of the Slovenian Soc. for NDT.  Portoroz, Slovenia: Sept. 4–6, pp. 389–402.
6. Sukhorukov D. V., Slesarev D. A., Abakumov A. A. (Jr), Polyakhov M. Yu. Sfera Neftegaz [Oil and Gas Area], 2010, no. 2, pp. 50–55 (in Russ.).
7. Slessarev D., Sukhorukov V., Belitsky S. et al. Magnetic in-line inspection of pipelines: Some problems of direct detection, identification and measurement. In: 9th ECNDT Abstracts. Berlin, ECNDT, 2006, p. Tu.3.1.2. (Full text: http://www.ndt.net/article/ecndt2006/doc/Tu.3.1.2.pdf, accessed 03.12.2015).
8. Sukhorukov V. Magnetic Flux Leakage Testing Method: Strong or Weak Magnetization?” Materials Evaluation. 2013, v. 71, no. 5, pp. 27–31.
9. RD EO 0488-03. Metodicheskie rekomendatsii po otsenke dostovernosti sredstv i metodik nerazrushayushchego kontrolya [Methodical recommendations on reliability assessment of NDT means and techniques]. Moscow, Rosenergoatom, 2003, 34 p.
10. EN 12927-8: 2004. Safety requirements for cableway installations designed to carry persons. Ropes. Magnetic rope testing (MRT).
 
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