11 Natural Gas Liquids recovery, namely, vessels crude oil processing and refining apparatus, equipment and installations in the nature of separators for the purification of liquids and gases, gas purification machines; water treatment apparatus, equipment and installations, namely, water treatment units for aerating and circulating water; gas sweetening systems comprised of regulating accessories for gas pipes and lines and electrochemical gas generators; amine gas sweetening systems comprised of regulating accessories for gas pipes and lines and electrochemical gas generators; contractor water cooling towers; amine contractor water cooling towers; reboiler drainage water treatment tanks; surge drainage water treatment tanks; reflux gas condensers other than parts of machines and solution electric coolers; reflux heat accumulators; reflux heat pumps; solvent heat pumps; solvent booster heat pumps; water filters; air filters for industrial installations; full flow water filters; activated carbon water filters; gas coalescing filters for air and gas conditioning; Acetylene flares for lighting and flare systems comprised of flare stacks for use in the oil industry; Acetylene flares for lighting for oil refineries, petrochemical and gas plants, off-shore drilling platforms, pulp and paper mills, landfills and food processing plants; steam-assisted, gas-assisted, high pressure, low-pressure, stage, sonic ground and enclosed acetylene flares for lighting and flare systems comprised of flare stacks for use in the oil industry for refineries, petrochemical and gas plants, off-shore drilling platforms, pulp and paper mills, landfills and food processing plants; self-supported, guy-supported and derrick-supported flare stacks for use in the oil industry; off-shore boom-mounted acetylene flares for lighting; portable acetylene flares for lighting; demountable acetylene flares for lighting; steam valves; gas fired water heaters; indirect gas fired water heaters; direct gas fired water heaters; separators for the cleaning and purification of gases; two phase separators for the cleaning and purification of gases; three phase separators for the cleaning and purification of gases; heat transfer equipment, namely, shell and tube and plate heat exchangers other than parts of machines; heat exchangers for chemical processing; furnaces; ethylene furnaces; liquefied propane gas recovery apparatus and instruments, namely, gas recycling system comprised primarily of pressure swing adsorption equipment for the recovery, purification and return of gases in industrial applications; atmospheric distillation apparatus and instruments, namely, water distillation units; vacuum distillation apparatus and instruments, namely, water distillation units; catalytic reforming apparatus and instruments in the nature of hydrogen-generation equipment and components, namely, hydrogen generators, hydrogen purifiers, hydrogen purification membranes, fuel processors, and steam reformers; hydrogen gas power plants; synthesis gas power plants; Industrial air filter machines; axial hot air blowers