Flanged industrial immersion heaters are commonly used in many chemical, petroleum and water-based applications. Consisting normally of an ANSI-rated flange with several hairpin elements or bugle tubular elements extending from the face of the flange, this electric heater uses direct heat application to the liquid medium. A thermowell often is used within the bundle of elements to allow for a probe (thermocouple, RTD or basic mechanical thermostat) to relay temperature readings to a digital controller that cycles and maintains the desired target temperature. Often, a high limit sensor also is used to help protect liquid mediums from overheating and offer protection to the flanged heater.
Wattco flanged immersion heaters allow the flexibility of using many different alloys to help resist corrosion and maintain longevity of the flanged heater. Steel flanges are typically used for lubricant oils, heavy and light oils, waxes and mildly corrosive liquids as well as low-flow gas heating. Process water, soap and detergent solutions as well as demineralized or deionized water applications often use steel flanges. Stainless steel flanged heating elements are used with mildly corrosive solutions as well as severe corrosive solutions. Food applications also use stainless steel for sanitary purposes. The sheath materials used can be steel, stainless steel, copper as well as exotic alloys such as Inconel, Hastalloy and titanium. Extremely corrosive environments such as salt water should use exotic alloys such as titanium to avoid sheath breach over excessive durations.