42 providing custom equipment design of pressure vessels, heaters, exchangers, tanks, separators, emulsion treaters and distillation columns for use in the oil and gas industry, wellhead gas production and dehydration units; custom systems design of processing plants, wellhead gas production and dehydration units, gas dehydration and liquids fractionation units, refrigeration systems, incinerators, combustors and emission control systems and engineering services for pump anchors and joints for the oil and gas industry