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Historic Boiler Inspection Procedures

It is recommended to schedule historic boiler inspections with a minimum of a 30-day advance notice. Please contact com.boilers@com.ohio.gov to schedule the inspection.

Phase One

  • Have boiler full of water and ready to hydro. 
  • Safety valve removed and opening blanked/flanged off. 
  • Note: Have test gauge and pump ready.


When performing hydrostatic pressure testing for verification of leak tightness or when required by the jurisdiction, the following requirements shall be met:


  • Hydrostatic pressure test shall be between the calculated maximum allowable working pressure and 1.25 times the calculated maximum allowable working pressure, and held for a minimum of 10 minutes or as required to perform a complete visual examination.
  • The metal and water temperature of the boiler shall be between 60 degrees F to 120 degrees F (16 degrees C to 49 degrees C) anytime a hydrostatic test is being performed.
  • A calibrated gage, acceptable to the inspector, shall be used when hydrostatically pressure testing boiler.


Phase Two

  • Drain and open boiler for internal inspection.
  • Note: Grates should be removed prior to hydro. 
  • If dry bottom, ash pan should be removed prior to hydro. 


Internal Surfaces should be cleaned prior to hydro.


  • Open all handholds and manholes.
  • If bolted, remove steam dome cover.
  • Remove fusible plug and have new ASME plug ready to install.
  • Remove caps/plugs from crosses and tees on pipe connections.
  • Assure all hand valves will open and close properly.
  • Be prepared to remove pipe fittings as requested.


Have copies of the following information on hand for the inspector:


  • Any technical references related to the boiler.
  • Any current or past inspection documentation.
  • Any documents concerning past repairs.