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chemical, chemistry, circular pipe, complexity, connection, conventional gas, energy, equipment, factory, field, flange, flap, fuel, gas, gas feeding, gas pipeline, gas tap, gas valve, gasification, gasoline, generation, heat, industrial, industry, installation, main, manufacturing, metal, modern, natural, oil, petroleum, physical, pipe, pipeline, power, pressure, reservoir, resources, rig, screw, steel, supply, tap, technology, transport, tube pressure, valve, vent, yellow,