The most common method used to determine the firing rate of individual process burners is with fuel capacity curves, which are graphs of firing rate vs. fuel pressure.

Sometimes called fuel injectors or nozzles, burner tips are used to control the injection of fuel into the burner. They utilize the available fuel pressure to distribute the fuel into the airstream to achieve proper mixing. Among the most important components in a burner, the tips directly impact safety, thermal efficiency, pollution emissions and operability.