NDLI: Measurement Error Influence on Gas Turbine Operability for Condition-Based Maintenance and Reliability/Availability Improvement

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Fadlun, Ever Avriel Michelizzi, Ilaria Iaco, Marco De
Copyright Year	2008
Abstract	Nowadays the major oil & gas companies are forced to move to a condition-based maintenance in order to extend mean time between maintenance (MTBM) and increase productivity, predicting gas turbine behavior and preventing unexpected failures. Gas turbine operability is influenced by many technological limitations, such as high temperature exposure limit of hot components, requested fuel composition flexibility, combustion chamber pulsations, pollutant emissions, rotor vibrations, compressor surge limit etc. In order to prevent exceeding these limitations certain significant measurable variables are monitored and controlled during machine operation; the instrumentation accuracy and stability have a strong impact on gas turbine reliability, availability and control. The aim of this paper is to demonstrate how the accuracy and stability of the instrumentation installed on a gas turbine has a direct influence on its operability. Monte Carlo simulations have been carried out to assess each instrument deviation effect and the level of impact. The second phase is oriented towards establishing an improvement process for a safe and reliable machine operation. Among the above-mentioned critical limits the main focus of this analysis is the firing temperature estimation and its control, which is performed by measuring gas turbine exhaust temperature and compressor discharge pressure. This study has highlighted how an error on compressor discharge pressure measurement during unit operation may provoke gas turbine over-firing or under-firing, respectively causing fast life reduction of hot components and the limitation of maximum delivered power. Furthermore, an error on compressor discharge pressure measurement would strongly decrease firing temperature estimation confidence, which is the main parameter for components residual life assessment to target a condition-based maintenance approach. In this paper the corrective actions to increase the accuracy of firing temperature estimation and control will be described. Based on the results of this study, reliability and availability improvements will also be presented. Using the present work as a guideline, similar analyses can be carried out for all other critical aspects that can be related to measurable variables.
Sponsorship	International Gas Turbine Institute
Starting Page	617
Ending Page	625
Page Count	9
File Format	PDF
ISBN	9780791843178
DOI	10.1115/GT2008-50749
e-ISBN	0791838242
Volume Number	Volume 7: Education; Industrial and Cogeneration; Marine; Oil and Gas Applications
Conference Proceedings	ASME Turbo Expo 2008: Power for Land, Sea, and Air
Language	English
Publisher Date	2008-06-09
Publisher Place	Berlin, Germany
Access Restriction	Subscribed
Subject Keyword	Temperature Firing Stability Instrumentation Compressors Maintenance High temperature Fuels Machinery Pressure Surges Emissions Exhaust systems Rotor vibration Errors Pollution Gas turbines Simulation Pressure measurement Engineering simulation Reliability Combustion chambers Corrective actions Failure
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in