16 Va. Admin. Code § 25-50-290
A. Upon completion of the installation of a new boiler or pressure vessel or at the time of the initial certificate inspection of an existing installation each boiler or pressure vessel shall be stamped with a serial number of the Commonwealth, consisting of the postal abbreviation for the Commonwealth and a unique series of numbers not less than 3/16-inch in height and arranged as follows:
VA 0000
§ 40.1-51.6 of the Code of Virginia.
Derived from VR425-01-75 § 2.28, eff. July 1, 1974; amended, eff. November 1, 1978; July 1, 1991; September 1, 1993; Virginia Register Volume 15, Issue 5, eff. January 1, 1999.