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ATSI Inc. is a full-service engineering consulting firm specializing in heavy industrial facility design, high temperature applications and analytical engineering. Based in Amherst, N.Y., the firm specializes in offering services ranging from electrical substation design, bus bar design and ASME pressure vessel design, to piping design services, structural steel connection design services and HVAC (heating, ventilating and air conditioning) engineering services. ATSI Inc. serves a broad range of industries, including iron and steel, manufacturing and utilities.