ASME GT 2005-68129 REVOLUTIONIZING GAS TURBINE MAINTENANCE IN LNG SERVICE
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26B0DB0B47D1422088640F763F008CD1 |
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文件大小(MB)： |
0.2 |
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页数： |
5 |
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日期： |
2008-8-17 |
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1 Copyright . 2005 by ASME,REVOLUTIONIZING GAS TURBINE MAINTENANCE IN LNG SERVICE,Stephen G Raymer,BP,Houston, TX 77079,USA,raymersg@bp.com,Charles A Gautschy,BP,Houston, TX 77079,USA,gautscca1@bp.com,B Fred Evans,BP,Houston, TX 77079,USA,evansbf@bp.com,Anthony S Andrich,BP,Houston, TX 77079,USA,andricas@bp.com,ABSTRACT,Atlantic LNG has developed a proven method for LNG,turbine maintenance, which will revolutionize the industry.,Over the life of Atlantic's 4-Train facility, this method will,reduce planned downtime by over a year. This paper details the,innovative approach that the authors took to reduce Atlantic,LNGs first major gas turbine overhaul from 29 days to 23 days,and the second major overhaul from 23 days to 18 days, with,the ultimate goal of a 12 day turnaround (TAR).,Atlantic LNG will soon begin a cycle in which a major,overhaul is required approximately every 6 months as we cycle,through our fleet of 26 Frame 5s. Using Gantry System,technology, the company will be able to achieve a 50%,reduction in downtime, which equates to approximately 1 year,of additional production over the life of the plant.,INTRODUCTION,Atlantic LNG Company of Trinidad and Tobago is a joint,venture company in which BP, BG, Repsol, Tractabel, and,NGC are all shareholders. Atlantic cools and liquefies natural,gas for export by tanker to the US and Spanish gas markets.,Atlantic’s LNG Plant is located in Pt. Fortin, Trinidad, where,there are 3 Trains operating, and a 4th under construction. Train,1 began operations in 1999, Train 2 in 2002, and Train 3 in,2003. Trains 1-3 each have six Frame 5 Gas Turbines driving,refrigeration compressors, while Train 4 has eight. Each Train,is designed to be able to operate at reduced rates (only half of,the Gas Turbines operating) to allow continued production,during scheduled maintenance. When Train 4 starts operations,in 2005, Atlantic will have 26 Frame 5D Industrial Gas,Turbines to operate and maintain. The scheduled maintenance,for these machines is an operational necessity and drives the,availability of the entire plant.,THE PROBLEM,Traditional Overhaul Method Duration,The gas turbine drivers that Atlantic LNG uses for,refrigeration compression are General Electric (GE) Frame,5D’s. These are large, industrial type gas turbines, in contrast,with the smaller and lighter “aero-derivative” type. The,maintenance cycle for these machines drives the overall plant,availability, because they are designed to undergo a periodic,major overhaul lasting 29 days every 48,000 hours.,The traditional overhaul method for industrial gas turbines,requires an in-place disassembly and inspection of the entire,gas turbine- both the high pressure (HP) and low pressure (LP),modules (Fig. 1). This is a time and labor-intensive activity,requiring a large amount of lay-down area for parts, operations,and maintenance personnel sharing the same work area in an,operating plant, and an extended exposure of maintenance,personnel to the operating plant. This method, with its focus on,speed and downtime, increases the temptation to take shortcuts,during the exposure of the internals to the environment. For the,Atlantic layout, a “best in class” overhaul using this method,takes 29 days.,Proceedings of GT2005,ASME Turbo Expo 2005: Power for Land, Sea and Air,June 6-9, 2005, Reno-Tahoe, Nevada, USA,GT2005-68129,2 Copyright . 2005 by ASME,Figure 1: Frame 5D Schematic,Overhaul Duration Drives Plant Availability,LNG critical path maintenance activities differ from most,other industrial gas turbine applications- for example a major,refinery overhaul usually is focused on equipment other than,the gas turbine drivers, such as catalyst replacement, furnace,repair, boiler and pressure vessel inspection, etc. For an LNG,plant, the availability of LNG production is directly related to,the time required to service the gas turbines. In fact, over half,of Atlantic LNG’s scheduled downtime for the life of the plant,is solely due to turbine overhauls.,Any LNG plant’s objective is to maximize LNG,production. The first step towards maximizing production was,to design parallel gas processing paths within a train so that,reduced rate production could be continued during the,maintenance cycle. Atlantic LNG’s parallel operation allows 3,concurrent overhauls while the remaining 3 turbines continue to,operate. The next step towards maximizing production was,minimizing scheduled downtime; and reducing the overhaul,duration is the most effective way to do that.,Figure 2: In-Place Maintenance of a Frame 5D,Additional Drawbacks of In-Place Maintenance,In place disassembly of a gas turbine inside an operating,LNG f……
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