Abstract: A system for heating equipment in a hazardous environment is provided. The system includes a control system configured to receive power from a power source, a heating pad configured to heat the equipment, the heating pad including at least one heating element, wherein the at least one heating element is a flexible semi-conductive self-regulating heating element, at least one thermal insulation layer positioned on one side of the at least one heating element, and a protective cover, wherein the at least one heating element and the at least one thermal insulation layer are sealed within the protective cover, and a power cable coupling the control system to the heating pad.

Abstract: A flexible homogeneous carbon polymeric heating element is provided. The flexible homogeneous carbon polymeric heating element includes a pair of layers of a first insulating material, a pair of layers of a second insulating material positioned between the pair of first insulating material layers, and an elongate web positioned between the pair of second insulating material layers, wherein one of the insulating materials is a chemical-resistant material, and the other of the insulating materials is a water-resistant material.

Abstract: A flexible homogeneous carbon polymeric heating element is provided. The flexible homogeneous carbon polymeric heating element includes a pair of layers of a first insulating material, a pair of layers of a second insulating material positioned between the pair of first insulating material layers, and an elongate web positioned between the pair of second insulating material layers, wherein one of the insulating materials is a chemical-resistant material, and the other of the insulating materials is a water-resistant material.

Abstract: A power transformer apparatus and method of assembling are provided. In one aspect, a method of assembling a transformer is provided. The method includes providing a heat sink including a plurality of exterior ribs, wherein the heat sink forms a bottom wall of an enclosure. The method also includes coupling at least one diaphragm to the heat sink such that a bottom surface of the diaphragm is in contact with the heat sink, coupling at least one winding to the at least one diaphragm, and coupling a terminal board to the heat sink such that a plurality of spacers are positioned between the terminal board and the heat sink.

Abstract: A power transformer apparatus and method of assembling are provided. In one aspect, a method of assembling a transformer is provided. The method includes providing a heat sink including a plurality of exterior ribs, wherein the heat sink forms a bottom wall of an enclosure. The method also includes coupling at least one diaphragm to the heat sink such that a bottom surface of the diaphragm is in contact with the heat sink, coupling at least one winding to the at least one diaphragm, and coupling a terminal board to the heat sink such that a plurality of spacers are positioned between the terminal board and the heat sink.

Abstract: An improved plastic heating element of the type including comprising an elongate web of flexible, electrically conductive plastic, having two electrodes embedded therein extending longitudinally adjacent each side edge. An electrically insulating adhesive layer covers the surfaces of the heating element.