From Steam Plant Operation, Eighth Edition
5.7 Oil- and Gas-Firing Safety Precautions
The National Fire Protection Association (NFPA) has developed a set of procedures and recommended interlocks and trips for the safe and reliable operation of oil- and gas-fired boilers. These procedures are used in the design of burners and combustion-control systems and include the following:
The accumulation of oil and gas is unacceptable anywhere other than in the fuel-delivery system. If a gas odor is present, ventilation of the area must be done immediately and the source of the leak determined and remedied.
A minimum airflow purge rate of 25 percent of full-load airflow should be maintained. This includes prepurging the setting and lighting of the lighters and burners until the air requirement exceeds the purge rate airflow.
A spark-producing lighter or a lighted torch must be in operation before any fuel is admitted into the furnace.
An airflow through the burners into the furnace and out the stack must be maintained at all times.
Adequate fuel pressure must be maintained at all times. For oil firing, both required pressure and temperature must be available, and for a dual fluid atomizer, steam or air pressure must be adequate at the atomizer.
By using proper procedures and operating skills, all fuels can be burned in a safe and efficient manner. Problems result when carelessness and misoperation of equipment occur and the fuel is burned in an unsafe manner.
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