Selecting a heating system for FRP and plastic tanks and vessels

Tank heating system design considerations such as temperature differentials and limits, thermal resistance components, and power requirements are reviewed, and the merits of two heater styles are analyzed in terms of efficiency, safety, and economy of operation. The two heater styles considered are self-limiting and low-watt-density constant wattage. Both styles are available as panel or strip heaters. The benefits and drawbacks of each design are noted with respect to a particular design example, while neither style is preferred overall, it is noted that for safe operation the self-limiting heater should be used with a thermostatic control