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These answers are certainly correct nI can tell from the content that there is lots of experience behind the previous answers. We are a pipe fabrication shop and holders of the following Stamps. ASME S Stamp, ASME U Stamp, as well a NBIC R Stamp. Like us, most folks have it stated some way in...

Some API and DOT regulations or standards require the hydro test charts from the chart recorders to be stamped. When performing an Alteration per NBIC I think the Calculations have to be provided by a PE as well.