Some NDT codes permit the use of blue light such as in the Xite-RB (equivalent to the earlier 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 blue light 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. NIGHTSEA can assist you with the necessary qualification.
Please contact NIGHTSEA at 781 791-9508 or email with any questions about blue light and NDT codes.
Note – BlueLine NDT and NIGHTSEA were divisions of the same company. The BlueLine name is no longer used and all products are supplied under the NIGHTSEA name.