Gas Compressor Restage Principles and Case Studies
Compressor installations in the oil and gas industry are subject to continuously changing operating conditions. While centrifugal compressors, especially when driven by gas turbines, provide a tremendous flexibility, it is often economic to restage the equipment. Restaging considerations are not only driven by gains in efficiency, and flow capability, or improvements in fuel efficiency. Important considerations also include the ease of restaging, downtime and cost. This paper discusses the design principles and solutions for centrifugal compressors with a low life-cycle cost. The criteria about restage and case studies are also presented.