Gas turbines have become established components of modern industry. Industrial and central-station units now total 3,614,000 hp installed, planned, or projected, and a wide variety of equipment is available. One generation of commercial industrial gas turbines—the Houdry process—has already become obsolete. Capacity limits of power-generating units are being increased to the 50-mw range, and combinations of gas turbines and steam turbines are offered for 150 mw. Pipeline transport of natural gas and crude oil uses the largest number of mechanical-drive gas turbines. Small gas turbines developed largely for military use have potential for use in industry and commerce.

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