Session: 20-02 PTC10 and Compressor Performance Measurement Techniques

Paper Number: 125064

125064 - A Practical Evaluation of Equations of State and the New PTC-10 Polytropic Calculations for Centrifugal Compressors 

The ASME Pressure Test Code (PTC-10) stipulates the need for a unified polytropic calculation procedure on reporting out performance characteristics for centrifugal compressors. The accurate determination of enthalpy and entropy, in addition to the thermodynamic gas constants, play a crucial role in predicting the performance of a compressor. The measured temperatures and pressures at the inlet and exit of the compressor are used to obtain the thermodynamic properties, which are in turn used to evaluate the compressor performance. These thermodynamic properties depend on the equation of state used for the calculations. In this paper, the influence of equation of state on the performance of centrifugal compressors on nitrogen, carbon dioxide and natural gas is investigated. Several commonly used equations of State including REFPROP, Redlich-Kwong. Lee-Kesler-Ploecker and Peng-Robinson will be used for the comparison. The yet-to-be released revision to the ASME PTC-10 code proposes the use of the Sandberg-Colby & Huntington’s methods to evaluate the polytropic performance of a centrifugal compressor. The use of these methods is investigated in this paper, and are compared with the standard Schultz’s method from ASME PTC-10’s 1997 version. A discussion on the use of these methods for other gases such as natural gas and hydrogen shall also be presented in this paper.

Presenting Author: Anand Srinivasan Solar Turbines Inc

Presenting Author Biography: xyz

Authors:

Anand Srinivasan Solar Turbines Inc
Rainer Kurz Solar Turbines Inc.
Timothy David Solar Turbines Inc