metengr:
I'm sure that these are "S" stamped units. They are designed by technician, who doesn't have formal engineering education, nor pressure vessel training, and stamped by P.Eng. drawings and code calculations are reviewed by TSSA inspector, (two) units are build by ASME Authorised pressure vessel fab shop and shipped to Minnesota.
From my prospective these are 100% Section VIII, Div 1 units. They are separate from boiler, do not have even near access to open fire, although, they installed between boiler and feed waters. Now, what is done it's done.
What would you do in these circumstances? Do I need to rise a concern with the mangement of our company, client, or National Board?