Thanks for the reply!

I had confused MPD with “maintenance planning document” with “mandatory permit directive” 😮 Thanks for the link anyway, the yakuk people have been wonderful posting all that information.

For the owner of the machine above – if there is no specific inspection specified a boroscope (internal visual) or an ultrasonic might be the go. The ultrasonic would first measure the thickness of the tank wall then look for discrepancies in that thickness (ie corrosion). Just a suggestion as I was wondering what I would do in the same situation.

Cheers!