Configurations Of Fired Heaters

	Vertical Tube, Cylindrical Heater This heater configuration is commonly used in hot oil services and other processes where the duties are usually small. However, large units, 100 million Btu/hr and higher are not uncommon. In the radiant section, the tubes may be in a circular pattern around the walls of the firebox or they may be in a cross or octagonal design in the firebox which will expose them to firing from both sides. Older designs have radiating cones in upper part of radiant section as well as longitudinal fins on upper parts of tubes. The shield and convection tubes, if any, mormally are horizontal.
	Horizontal Tube, Cabin Type Heater This heater configuration may have the hip as shown here, or the radiant may be just a rectangular box. In the radiant section, the tubes are along the wall including the hip. The burners may be in the end of the firebox or the bottom or the side walls. If fired from the sides, there is often a firewall down the center of the box.
	Helical Coil Heater This heater configuration is commonly used where the duties are small. Since each pass consists of a separate winding of the coil, pressure drop options are limited. Many of these only have a radiant section, since efficiency is often not that critical, especially in intermittent services like for a regeneration heater.
	Multiple Cell Heater This heater configuration is often used in Refinery heaters where radiant duties are high. Also allows separate control of heat duties in different cells.