Regarding 'questioning' the local jurisdiction, you may, & maybe you should. Contact info for the Chief Inspector of any particular state may be found in the "Synopsis of B&PV LAWS" (emphasis on that last word) published by NBIC.
Codes or standards in themselves are not laws. Individual states...
I'd check reqmts of the local jurisdiction as they may dictate specific Code editions/addenda. (see Synopsis of Boiler & Pressure Vessel Laws, available from the National Board)
Any locality reqmt would of course take precedence over any Code.
Normally you'd use the latest Code...
