NDT Codes and the FL5000

Some NDT codes permit the use of blue light such as in the BlueLine NDT FL5000 as an alternative to ultraviolet light for inspections, while others do not. In addition, some companies are able to establish their own procedures. No matter the situation, the important thing is always to determine that the light enables you to see the indications that you need to see.

Whether the use is code-approved or not, there are multiple ways to incorporate the light in your workflow.



ASTM codes such as E1417 (Standard Practice for Liquid Penetrant Testing) and E1444 (Standard Practice for Magnetic Particle Testing) still require the use of ultraviolet light at 365nm. These have NOT been amended to allow use of blue light. If your inspections are governed by these standards then you may not use the FL5000 for final inspection.



ASME permits the use of ‘alternate wavelength light sources’ such as blue light with fluorescent magnetic particles when qualified and used according to the relevant guidelines. These appear in Article 7, Section V (Nondestructive Examination) of the Boiler and Pressure Vessel Code. The guidelines for qualifying the sources are outlined in Mandatory Appendix IV. BlueLine NDT can assist you with the necessary qualification.


Please contact BlueLine NDT at 781 791-9511 or email with any questions about the FL5000 and NDT codes.

Note – BlueLine NDT and NIGHTSEA are divisions of the same company. The web sites have been combined here for convenience.