Flanged Immersion Heater

Flanged immersion heaters can be used in different applications. In order to meet the heating requirements of a specific application and have a safe operation in the environment within which a heater operates several factors should be taken into consideration in the design of flanged immersion heaters. The following are a number of criteria that should be considered:

• The pressure rating and the material of a flange.
• The sheath material of the tubular elements. Table 2 provides recommended tubular element sheathe and flange materials for different mediums.
• Operating temperature and a watt density of tubular elements that are adequate to the material heated. Table 2 provides maximum operating temperatures and watt densities that are recommended for heating various materials.
• Design watt density, flow velocity, outlet temperature are factors that contribute to the temperature level that tubular elements will attain. The table below shows the maximum temperatures that different sheath materials could be subjected to:

• Safety issues considering the environment within which the immersion heater will operate.
• Utilization of adequate temperature controlling devices, temperature and pressure high limit switches, low liquid level and flow controllers and other control/safety devices that will control the heating process and protect the heater from excessive heat.
• The classification of the electrical terminal box required (NEMA1, NEMA4, NEMA7, NEMA12 etc…).
• The level of the contamination that the immersion heater will be exposed to
• Safety and electrical code consideration
• The possible requirement of baffles that force a gas or a liquid to circulate around heating elements when flanged immersion heaters are used inside circulation tanks.

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