Comparison of operating characteristics of a two-shaft gas turbine with a single-shaft gas turbine for gas line pumping

Abstract

Gas turbines are playing an important role in the ever-expanding gas-transportation industry. Coupled to a centrifugal compressor the gas turbine provides a low-cost, flexible prime mover for gas transmission. The two types of gas turbines most commonly used in this field are the single-shaft unit and the two-shaft unit. This paper describes and compares the operating characteristics of each unit along a typical centrifugal-compressor loading line for constant station discharge pressure. Horsepower-speed relationships and specific fuel consumption are considered in this comparison.