State offices and all DLLR physical locations will be closed to the public December 24 & December 25, 2014. However, Unemployment Insurance telephone and Web operations WILL be available on Wednesday, December 24.

DLLR's Division of Labor and Industry


Do's and Don'ts of High Pressure Boiler Operations - Boiler and Pressure Vessel Safety - Safety Inspections


The following is a partial list of operational guidelines and requirements, which will provide a safer, more economical operation and extend the operating life of your boiler.


  • Operate a boiler which is not constructed the American Society of Mechanical Engineers (A.S.M.E) Code.
  • Operate a boiler unless it is equipped with a safety valve, with sufficient relieving capacity, set at or below the maximum allowable working pressure.
  • Ever bypass the pressure controls, low water cutout, or any other limit switch or control.
  • Ever restrict the design function of any safety valve, such as by reducing or plugging the outlet, painting, or removing it.
  • Permit unqualified personnel to operate a boiler.
  • Ever leave the boiler unattended for long periods of time.
  • Operate a boiler without an adequate source of combustion air.
  • Operate a boiler without an adequate source of combustion air.
  • Operate a boiler without a valid certificate of inspection.


  • Respect the boiler. It can be dangerous!
  • Have the vessel inspected internally annually, as required by State law.
  • Report newly installed boilers to the State Office of Boiler and Pressure Vessel Safety.
  • Test safety controls and devices on a periodic basis (as recommended by CSD1).
  • Ensure boiler operators are adequately trained to assure safe and efficient operation.
  • Inspect the boiler daily for proper operation, and/or adverse conditions.
  • Maintain a log of incidents that effect boiler operation, and when safety controls and devices were tested (i.e., low water cutout, safety valve(s), combustion controller).
  • Allow only authorized ("R" stamp or proper ASME symbol holder) repair firms to make welded repairs.
  • Have you burner serviced immediately, if the burner starts with a puff or operates in an unusual manner.

Quick Links:

For additional information, contact:
Division of Labor and Industry
Boiler and Pressure Vessel Safety

1100 N. Eutaw Street - Room 605
Baltimore, MD 21201
(410) 767-2330
FAX: (410) 333-7827

Emergency telephone number:  (410) 767-2990