This recommended practice covers Type F, Type G, and Type H fluid heaters and related equipment.
Within the scope of this recommended practice, a fluid heater is considered to be any thermal fluid heater or process fluid heater with the following features:
(1) Fluid is flowing under pressure.
(2) Fluid is indirectly heated.
(3) Release of energy from combustion of a liquid or gaseous fuel or an electrical source occurs within the unit.
Purpose. This recommended practice provides recommendations for fluid heaters to minimize the fire and explosion hazards that can endanger the fluid heater, the building, or personnel.