Industry publication, December 2001

NYC 9/11 Public Portal Document

5

i . www.aldridge-electric.com [T E CH 1 , 28572 N. Bradley Road ' t Libertyvine, IL 60048 ing projects. But PSCO struggled for ALDRIDGE DRILLED,^AFT .2X847) 680-5200 Telephone years with operation and maintenance FOUNDATIONS... ^1 (8475:680-5298 Fax problems before it finally shut down the /n”'' ■■

! gas-cooled reactor in 1989. A decade later, the advance of CC tech­ 1 • Nation Wide Coverage i ■' nology, coupled with market incentives • All Soils &RockDrillif^ i through industry deregulation, drove ( All Dimensions & Depths _ PSCO to repower the idle station, using three GE FAs and three supplementary- •F\ilIService4^urn-Key5Foundatiorfs 1 fired HRSGs. Three power trains were • Drilled S^afts ForAll^ur Foundation Needs — i needed to take full advantage of existing • Substation & Transrijifefeion Drilled Shaft Foundations capacity in the steam-turbine generator. The first of these trains started operating in 1998; the second in 1999; the third in 2001. Utility Engineering Corp., Denver, IK OVERHEAD ELECTRICAL provided engineering, procurement and DUCT BANK CONSTRUCTION construction services for all three phases UNDERGROUND ELECTRICAL of the project. SUBSTATION CONSTRUCTION With new construction and repower­ ing projects moving ahead at breakneck speed, the order backlog for F-class tur­ bines now stretches for years. And the future may hold even more promise for GT suppliers, as newer G- and H-class I ■ *•

fi machines move toward commercializa­ tion. These next-generation designs will NKM*— use steam rather Sian air to cool hot-gas- path components, thus enabling firing temperatures—and subsequently thermal '^■•^1 in efficiencies—to be increased. In the “partially” steam-cooled G-class, steam cools the combustor to maintain the same level of NOx emissions as earlier 1 I models, but at a higher firing tempera­ ture—approximately 2,580°F, versus 2,400°F for the F-class. The Siemens West­ inghouse W501G also features an aggres­ sive compression ratio for a design effi­ ciency of58% (LHV), in CC configuration. The first operational steam-cooled GTs in the U.S., W501Gs from Siemens Westinghouse, are PG&E National Ener­ gy Group’s 360-Mw combined-cycle Mil­ ■s?i lennium powferplant in Charlton, Mass., and the City of Lakeland, Fla.’s, McIn­ ' -A tosh 249-Mw simple-cycle unit. Both achieved commercial operation in 2001. In the fully steam-cooled H-class, steam cools the combustor, plus turbine blades and vanes, enabling a firing tem­ perature of 2,600°F. The GE version of the H-class GT also employs the world’s largest single-crystal airfoils, which are intended to make the turbine blades I more resistant to high-temperature cracking than the multidirectional crys­ H What’s the Value of a Good Night’s Sleep? J tal design used in most of today’s GTs. GE’s first H-class unit is under con­ . As a family-owned business i'ri ils third gengralion', Graycor has been providing consirucrion struction at the Baglan Energy Park in services across the country lor 80 years. Safety, quality and reliability are our trademarks. In South Wales, U.K., scheduled for start-up Graycor is one of only a handful of contractors with ISO 9000 registration. Let us buiftfiws® in the summer of 2002. The single-shaft project. Grayc'or—always taking on the hard jobs. 708.206.0.500 CC—a 36-ft-long, 15-ft-dia, 370-ton behe­ moth—is designed to break the 60% thermal efficiency barrier (LHV). Advances in GT technology are driving

POWERPLANT CONSTRUCTION’S?

NYC-WTC_000141983