Pressure vessel surface flaw detection

[MechEngD]

Are eddy current methods allowed under PD5500, to detect surface flaws on carbon steel pressure vessels? Working through section 5.6 Non-destructive testing (components to construction categroy 2), eddy curent methods are not mentioend. However, this method is allowed for to test aluminium alloys (Aluminium supplement). Thoughts?

 

[CuMo]

Use dye pen or ultrasonic surface flaw detection.