• Prevent solidifying or freezing.
• Maintain the minimum viscosity to pump the liquid.
• Initiate a reactor or maintain the chemical feed at a temperature effective for reaction.
• Provide heat for the fluids within the closed circulation system of heat transfers.
A typical method that provides tank temperature heating and maintenance is to tap into an existing source of energy within the plant, such as a heat transfer or steam system loop. The coils could be wrapped around a vessel or tank to make up any heat losses. This method could also impart heat into a vessel or tank for processing.
When a heat transfer or steam heat source is not easily available or installation is too costly, electric heat may be an option. The electric heat to provide external warming of tanks is accomplished by an external source, which is typically heat tracing in some form or another.
Heat tracing is most often used to prevent freezing of pipes or lines, and occasionally tanks. On a large tank; however, the use of heat tracing could be very costly. Because it is an external heat source, it can be used most efficiently to make up any losses, instead of providing the additional heat to raise the content of a tanks temperature.