NDT.net - February 2003, Vol. 8 No.2

REPRODUCIBILITY PROBLEM FOR THE PROCEDURE OF TYPE TESTING OF LIQUID PENETRANTS

M. Stadthaus, H.-M. Thomas
(BAM, Unter den Eichen 87, D-12203 Berlin, GERMANY),
J. Baugatz, W. Kצnig
(MPA, Appelstr. 11A, D-30167 Hannover, GERMANY),
N. P. Migoun, P.P.Prokhorenko, A. B. Gnusin
(IAPh, Academicheskaya str., 16 Minsk, BELARUS)
Paper presented at the 8th ECNDT, Barcelona, June 2002

Abstract

Conclusions

  1. Different sets of reference blocks may have different abilities for the absolute evaluation of penetrant sensitivity. It requires establishing a quantitative correlation between the abilities of the test panels for determination of penetrant system sensitivity by independent laboratories in order to get comparable results.
  2. The differences between panels A and B of the same reference block may take place and have to be taken into account. For the relative evaluation of penetrant systems quality should be used an appropriate equipment such as the image-processing system.
  3. Type testing procedure should be conducted ensuring the characteristics of excess penetrant removal, developer application and viewing conditions as constant as possible.
  4. The reliability of sensitivity evaluation is considerably increasing by repetition of the procedure and averaging the results.
  5. Image processing systems can be considered as an optimal tool for an objective, quantitative absolute and relative evaluation of penetrant system sensitivity.

References

  1. M. Stadthaus, H.-M. Thomas. Proceedings of the Conference “NDT’99 & UK Corrosion’99”, Poole, UK, 1999, p.221-225. [conference]
  2. EN ISO 3452-3. Non-destructive testing – Penetrant testing – Part 3: Reference test blocks. [standard]

Acknowledgement

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