The State of California CA Boiler Section oversees all boilers and pressure vessels in the State of California.The pressure vessel unit is responsible under Labor Code sections 7620 for the inspection of boilers (any fired or unfired pressure vessel used to generate steam pressure by the application of heat), and tanks (any fired or unfired pressure vessel used for the storage of air pressure or liquefied petroleum gases). (excerpt from the State of California's boiler section official web site)