Boiler Shutdown

{
  "id": "MLC-T-ENV-003520",
  "term": "Boiler Shutdown",
  "field": "Environment",
  "definition": "1. Period in which cessation of operation of a boiler is initiated for any purpose. Shutdown begins when the boiler no longer supplies useful thermal energy (such as steam or hot water) for heating, cooling, or process purposes or generates electricity, or when no fuel is being fed to the boiler, whichever is earlier. Shutdown ends when the boiler no longer supplies useful thermal energy (such as steam or hot water) for heating, cooling, or process purposes or generates electricity, and no fuel is being combusted in the boiler.\n\n2. Cessation of operation of a boiler for any purpose. Shutdown begins either when none of the steam from the boiler is used to generate electricity for sale over the grid or for any other purpose (including on-site use), or at the point of no fuel being fired in the boiler, whichever is earlier. Shutdown ends when there is both no electricity being generated and no fuel being fired in the boiler. [40 CFR 63.10042 (CFR 2013)]\n\n3. Shall begin when the unit drops below 300 MW net load with the intent to remove the unit from service. The precipitator shall be maintained in service until boiler fans are disengaged. This rule provides an affirmative defense to actions for penalties brought for excess emissions that arise during shutdown episodes. An affirmative defense is not available if during the period of excess emissions, there was an exceedance of the relevant ambient air quality standard that could be attributed to the emitting source.",
  "references": [
    "40 CFR 63.11237 (CFR 2017)",
    "40 CFR 63.11237 (CFR 2013)",
    "40 CFR 49.5513 (CFR 2013)"
  ],
  "url": "https://mlchart.com/terminology/environment/boiler-shutdown/"
}