Session: 20-02: Gas Turbine Operation and Maintenance

Paper Number: 152205

Development of User Gas Turbine Performance Calculation Tool Based on the ASME PTC 22 Code 

This paper presents the development of a gas turbine performance calculation tool based on the ASME PTC 22 Code. It serves as a comprehensive guide for replicating the tool, which evaluates gas turbines' performance in various scenarios: test-bench, site-specific, and contractual. The code has been extensively tested, refined, and enhanced beyond its initial ASME PTC 22 framework to ensure greater reliability and accuracy.

The Company decided to develop an in-house tool to independently evaluate the performance of gas turbines without relying on the Original Equipment Manufacturer (OEM) or third-party assessments. This tool serves as a means to verify site-specific performance, define contractual performance conditions, and establish mutual agreement on tolerances regarding contractual power and heat rate.

The PTC22 power test code was originally developed for large gas turbines and is not specifically designed for the Oil & Gas sector, especially offshore applications. The Company’s tool integrates a model that considers three streams instead of the two used in the  PTC22. This modification enables a more precise evaluation of heat radiation and secondary flows within the heat balance equation. Additionally, the Company’s method based on published gas turbine performance data has been implemented to accurately determine heat radiation levels and exhaust flows as specified by the manufacturer at ISO conditions.

Using the manufacturer’s specific correction curves, this tool converts site-specific measurements to both ISO and contractual conditions, ensuring reliable performance evaluations in accordance with the methodology agreed upon by the OEM. During factory acceptance tests, thorough analyses are carried out to verify that the tool’s calculated performance results are in agreement with the manufacturer’s performance calculations. These results are presented in this paper.

The paper also discusses additional functions developed to calculate a wider range of parameters, such as compressor isentropic efficiency, compressor power, high-pressure (HP) and low-pressure (LP) turbine isentropic efficiencies, exhaust heat, exhaust flow, and turbine inlet temperature (TIT).

Developed using Python, the gas turbine performance calculation tool operates through a main program that applies the ASME PTC 22 methodology, along with improvements to the calculations for relative humidity input data. In addition, CO2 emissions are evaluated based on the fuel composition. To maintain readability and avoid code replication, several calculations have been converted into functions that are called by the main program as needed.

Finally, this gas turbine performance tool is used on-site to evaluate gas turbine performance and verify its degradation over the continuous 24/7/365 operational regime. Future developments aim to connect this in-house performance calculation tool to the Company’s data system to enable real-time gas turbine monitoring.

Presenting Author: Dominique Orhon TotalEnergies S.E.

Presenting Author Biography: Dominique Orhon is a Senior Turbomachinery Specialist at TotalEnergies, in France. He has been with the business of turbomachinery design for more than 35 years. In 1988, he started working for the compressor and steam turbine manufacturer Thermodyn as a steam turbine designer and then joined the Oil & Gas Operator, TotalEnergies in 1991. He achieved design, construction, commissioning and start-up of two major offshore projects (30 000 bbl/d and 240 000 bbl/d) as Lead Mechanical and has been Rotating Equipment Head of Maintenance for TotalEnergies E&P Angola. Dominique is involved in turbomachinery design, integration in process, operation and trouble shooting and is specifically in charge of gas turbine qualification for the Company. He is an active support of the Company's R&D initiatives for decarbonization (CCS, Low Carbon Fuels). He is a Project Board Member of ETN (Energy and Turbomachinery Network) organization and is a Rotating Equipment lecturer at the ENSPM (Ecole Nationale Supérieure du Pétrole et des Moteurs) in Paris, France. Dominique has published papers and presented panel sessions at international conferences, especially ASME TURBO Expo. He is graduated from the Ecole des Hautes Etudes Industrielles (HEI) in Lille, France, with a Master’s Degree in Engineering.

Authors:

Dominique Orhon TotalEnergies S.E.
Poemana Ropiteau TotalEnergies S.E.