(a) No boiler shall be operated at a pressure in excess of the working pressure specified in the latest inspection certificate. Boilers of standard construction shall have an original factor of safety as determined by the ASME Code.

(b) Standard boilers of lap seam construction shall have a factor of safety determined in accordance with the ASME Code.

(c) For nonstandard boilers and reinstalled boilers see sections 14-10.1 through 14-10.4 of this Part.

(d) If it shall become necessary to increase the steam pressure allowed before the expiration of the certificate of inspection under which a boiler is being operated, a new certificate shall be required and the commissioner notified.