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Suggested Daily Boiler Log Program

Summary: The following article is a part of National Board Classic Series.



The following instrument readings, as appropriate to the specific boiler system, need to be taken daily for low-pressure heating boilers and at least once per eight-hour shift for high-pressure boilers. These readings must be recorded in the boiler log.

NOTE: It is very important that the boiler log be kept in a consistent format, in order for trends to be perceived and followed with preventive action. Standard forms are available for this purpose; however, the log may be more useful if the log form is customized for the particular installation.


  • Air compressor, control pressure (psig)
  • Outdoor air temperature (degrees F)
  • City water supply pressure (psig)


  • Boiler(s) in service
  • Fuel in use
  • Operating time (hours)
  • Operating cycles(number)
  • Amount of fuel on hand
  • Boiler water level (normal, low, high)
  • Firing level (rate)
  • Flame condition (observed)
  • Boiler pressure (psig)
  • Boiler water temperature, hot water (degrees F)
  • Stack temperature, net (degrees F)


  • Pilot gas pressure (inches WC)
  • Burner gas pressure (ounces/square inch or psig)
  • Gas used (cubic feet)


  • Oil pump in service
  • Vacuum at oil pump (inches Hg)
  • Oil pressure at pump (psig)
  • Oil pressure at burner (psig)
  • Oil pressure at regulating valve (psig)
  • Atomizing medium pressure, air, steam (psig)

CONDENSATE SYSTEM (steam boilers)

  • Boiler feed pump in service
  • Condensate return temperature (degrees F)
  • Water level in condensate tank (normal, low, high)
  • Make up water rate (gallons)


  • Circulating pumps in service
  • Return water temperature (degrees F)
  • Water level in expansion tank (normal, high, low)


  • Level of chemicals in treatment tank
  • Treatment pump in service (low, normal)
  • Boiler water samply taken


  • These operations should be recorded in the log



Editor's note: Some ASME Boiler and Pressure Vessel Code requirements may have changed because of advances in material technology and/or actual experience. The reader is cautioned to refer to the latest edition of the ASME Boiler and Pressure Vessel Code for current requirements.

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