How does natural convection heat the process pipe in a bare tracing system?
When Bare Tracers are installed on a pipeline and the traced line is covered with thermal insulation, heat circulates by natural convection from the steam tracer to the annular space between the oversized insulation and the traced pipe and from the annular space to the pipe. Some of the heat in the annular space will also pass through the insulation material to the ambient air. It must be remembered that a certain amount of heat will be transferred to the process pipe by radiation. Some heat will also be transferred by conduction at the contact points between the tracer and the pipe.