Transportable system for providing heat to flowing materials

An apparatus for connection in-line to a pipeline of a producing pretroleum product well and the like for heating the petroleum product flowing in the pipeline for in-process removal of built-up parafin and the like from the inner surface of the pipeline, said apparatus comprising:

• a combustion section and heat transfer section,
• said combustion section comprising an air heater means, blower means for causing a predetermined volume of air to flow through said heater means to be heated and into the heat transfer section, and conduit means for recirculation of air from said heat transfer section to said combustion section,
• said heat transfer section comprising a heater shell, and, disposed therewithin, a heat transfer tubing coil adapted to be connected in a pipeline of a producing petroleum product well, upstream of built-up material to be removed, for receiving the flow of petroleumm product in said pipeline from said well, product in said pipeline being caused to flow through said coil, and means for causing the heated air from said combustion section to flow across the coil in said heater shell for transfer of heat from said air through said coil to the product flowing therewithin, said tubing coil further comprising fin means disposed about the exterior of said tubing and extending outwardly therefrom for relatively greater surface area about the exterior of said tubing coil, said fin means and said tubing coil being formed of material having greater thermal conductivity than the petroleum product film coefficient within said pipeline and said fins means and said tubing coil being joined in a manner whereby heat is transferred uniformly about said fin means and tubing coil, and the rate of heat transfer from said coil to said petroluem product is greater than the rate of heat transfer from the heated air into said fin means,
• whereby the temperature of the product in said coil is raised to a predetermined temperature to liquify material built up on the inner surface of said pipeline to flow with said petroleum product.