Selection of Materials and Material Related Processes for Centrifugal Compressors and Steam Turbines in the Oil and Petrochemical Industry

Abstract

In today’s marketplace the selection of materials for the various components for centrifugal compressors and steam turbines is very competitive and an important factor in the overall cost and delivery of the product. This paper reviews the material selection for major components for compressors and steam turbines such as shafts, impellers blading, bolting, seals, etc. This paper is not intended to cover reciprocating, screw compressors, and high temperature hot gas expanders. Various material properties are discussed for the manufacture and service exposure of major components such as impellers, shafts, bolts, blades, and casings. Due to the various aggressive corrosive, fouling, and erosive environments in which both compressors and steam turbines are operated in, coatings must frequently be used to prolong the life of the machine. The application of various coating systems will be reviewed and how effective the coating system is with respect to withstanding the particular environment. Also discussed are the repairs for long lead time components such as rotors and the application of design proven repair procedures utilizing a design for fitness for service approach.