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
Fax: 410-333-7827
e-mail: dldliboilerinspection-dllr@maryland.gov

Emergency telephone number: 410-767-2990