Md. Code, Public Safety § 12–914

A person who repairs or alters a boiler or pressure vessel shall:

(1) give notice to and obtain approval from the Chief Boiler Inspector, a deputy boiler inspector, or a special inspector before beginning a repair or alteration that:

(i) affects the working pressure or safety of a boiler or pressure vessel; or

(ii) involves fusion welding;

(2) repair the boiler or pressure vessel in accordance with regulations adopted under this subtitle; and

(3) provide reports, as required by regulations adopted under this subtitle, to the Chief Boiler Inspector and the owner of the boiler or pressure vessel.