Q2 2005

Cycling, P91/T91, valve issues dominate discussion at annual meeting

Taxmpa’s spectacular Saddlebrook Resort was the venue for the annual conference and exhibition of the HRSG User’s Group—like last year. One has to wonder why attendees are so concerned at where this meeting is held, because other than a round of golf for about 10% of the participants the day before the conference begins, nobody can be found outside the cavernous meeting room and expo hall where the event is conducted. Not even the vendors are tempted by the huge pool. more

More ideas for bridging the gap between low first cost and low life-cycle cost

More ideas for bridging the gap between low first cost and low life-cycle cost

By Dick Laughter and Jeff Daiber

Design enhancements capable of increasing reliability and reducing the life-cycle cost of heat-recovery steam generators were presented in “Bridging the gap between low first and low life-cycle cost,” COMBINED CYCLE Journal, Spring 2004 (access at www.psimedia.info/ccjarchives.htm). These same enhancements were discussed in an open forum early this year at the fourth annual CCGT Users’ Conference, attended by combined-cycle O&M professionals and representatives from HRSG aftermarket groups. After two days of discussion, consensus of the attendees was that the original list of 17 enhancements should be expanded to 25 based on lessons learned by the group. more

Six steps to successful repair of GT components

By Hans van Esch, TEServices This is the first in a series of four articles outlining the six critical steps to successful refurbishment of industrial gas-turbine (GT) parts. First two steps—onsite assessment of component condition and development of repair specifications—are presented below. The second article (next issue) will provide guidelines for selecting the appropriate repair vendor(s) to meet your plant’s specific needs; the third will describe the vendor verification process for incoming inspection; the last, vendor verification of repair, coating, and inspections performed during the refurbishment process of your components. more

Transition-piece repair/retrofit, blade/vane repair, compressor washing major topics at annual meeting

The W251 Users Group has a new chairman in Federico Kitzberger (fkitz@capex.com.ar), who is busy working on the program for the organization’s next meeting, tentatively scheduled in parallel with Power- Gen International, Las Vegas, in early December. But this article is not about the next meeting, it’s about the last one. more

Some half-built combined-cycle plants can be had for a ‘song,’ but they are not without challenges

Somewhere in China, a while ago, someone reportedly said, “May you live in interesting times.” Perhaps that person was gazing at the heavens and had a vision of the men and women associated with the US gas-turbine-based power business at the end of the 20th century and beginning of the 21st. Consider the following: In the late 1990s, the relatively low price of natural gas and the promise of riches in deregulated power markets converged to create the greatest boom market in this sector of the electric power industry. From the beginning of 1998 through the end of 2004 more than 200,000 MW of GT-based capacity was installed in the US, according to A Michael Schaal, an analyst for Energy Ventures Analysis Inc, a consulting firm in the Washington (DC) area. And still more equipment was ordered for plants cancelled prior to the start of construction and during construction. more

Maintenance tutorials at annual meeting key to problem-solving

All 10 of the gas-turbine (GT) user groups covered regularly in the COMBINED CYCLE Journal (CCJ) conduct meetings that are similar in format and content and all do at least a satisfactory job of meeting member expectations. A couple of groups do an especially good job; the Western Turbine Users Inc, Long Beach, Calif, is one of them. WTUI, organized in 1990, is a membership organization of General Electric Co (GE) LM2500, LM5000, and LM6000 aeroderivative GT users, manufacturers, and service providers. The group’s mission is to provide a forum for the exchange of technical, operations, and maintenance information and experience with the goal of improving the reliability and profitability of generating facilities—simple cycle, cogeneration, and combined cycle—using these types of engines. more