Maryland Public Safety Section 12-914
§ 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.