dense phase fluids that are ordinarily gaseous or liquid, namely, air, hydrocarbons, and refrigerants; dense phase working fluids that are ordinarily gaseous or liquid, namely, air and any of its constituent components, hydrocarbons, and refrigerants

Research and development in the field of liquefied natural gas or compressed natural gas production; research and development in the field of hydrocarbon production, fracturing and proppant delivery; research and development in the fields of pumping systems, systems for producing or storing energy, and systems for producing refrigeration