What is the difference between a fitting a piping system and a pressure vessel? How does it affect how it is registered?
A fitting can be a small pressure vessel, or a valve (of almost any size) or other items like flanges, expansion joints or hoses, strainers measuring devices, pressure relief devices or other miscellaneous components. For a fitting, the manufacturer can do their own inspection. For a pressure vessel, an authorized inspector needs to do the inspection. Fittings require statutory declarations and so can be more complicated and expensive to register. Fitting calculations and drawings do not need to be updated every year as code rules change but the CRN expires after 10 years.
