Session: 09-03 Gas Turbine Power Plant

Paper Number: 82701

82701 - Improving Gas Turbine Maintenance Quality 

Planned maintenance outages account for over 70% of gas turbine unit unavailability. A complete overhaul of a large frame-sized gas turbine can require up to 10-12 weeks. Improper reassembly procedures and wrongly applied maintenance e practices can ultimately result in catastrophic failure and loss of human life. To address owner/operator growing concerns regarding the quality of gas turbine planned maintenance outages, EPRI in conjunction with its member companies has developed and demonstrated key tools, methods, and guidance for improving the disassembly, inspection, reassembly, and re-commissioning gas turbine units during planned outages, including:

·       Key maintenance activity check lists that include disassembly and reassembly hold points, verification points, and witness points with acceptance criteria

·       Inspection techniques and quality control Inspection Assessment Data Sheet (IADS) forms for the rotating, stationary, combustion and structural turbine parts. Each IADS includes a sketch or photo of the part, expected dimensions, typical findings, and field repair methods with GO- or NO-GO acceptance criteria.

·       Companion field guidance (FG) for each IADS, with recommendations for typical damage findings

·       Reassembly hold points, verification points, and witness points with acceptance criteria (both typical and not-to-exceed criteria) 

·       Application p PCRT testing for part quality control verification

·       Optical alignment verification method

This paper discusses the development and application of these tools and the future gas turbine maintenance activities in an evolving IGT work force environment.

Presenting Author: Leonard Angello EPRI

Presenting Author Biography: Leonard Angello is a Technical Executive at the Electric Power Research Institute (EPRI).<br/><br/>Mr. Angello has over 35 years of combustion-turbine, technology development experience serving the gas and electric utility industries, including over twenty five years’ experience in the development of combustion system hardware, diagnostic instrumentation, performance monitoring methods, field-surveillance and durability testing of large utility combustion turbines. <br/><br/>In February 2000, he returned the EPRI as Manager of Combustion Turbine Technology following a nine-year interval as Vice President of Clean Air Technologies, an independent consulting firm specializing in the implementation of emission control and monitoring technologies for the gas and electric utility industries. <br/><br/>Prior to founding Clean Air Technologies, Mr. Angello served as Director of Utility Systems for the Energy and Environmental Research Corporation (EERC). Prior to joining EERC, he served as Technical Manager for Environmental Control Systems Department of the Electric Power Research Institute (EPRI). While at EPRI for over thirteen years, he oversaw the integration of R&amp;D activities among the Air Quality Control, SO2 Control, and Water Management Programs. Prior to joining EPRI, Mr. Angello planned and managed exploratory research programs concerning the production and combustion of gas turbine fuels at the Air Force Aero Propulsion Laboratory.<br/><br/>Mr. Angello received a Bachelor of Chemical Engineering Degree (BChE 1971) from Ohio State University, a Master of Mechanical Engineering Degree (MME 1975) from the University of Dayton, and a Master of Business Administration Degree (MBA 1987) from the University of California at Berkley. Prior to receiving his MBA, Mr. Angello completed a program of Post-Graduate Studies in Thermal Sciences at Stanford University.

Authors:

Leonard Angello EPRI
John Scheibel EPRI
Nick Smith EPRI
David Noble EPRI