Category Archives: Miscellaneous

7HA users wrestle with emergent issues at inaugural meeting

A CCJ ONsite Special Report Welcome the 7HA Users Group into the pantheon of power-industry organizations seeking peer-to-peer interaction to solve problems expeditiously and provide a collective check on official OEM positions regarding fleet- and plant-level issues. Representatives from well over a dozen facilities and five countries, responsible for 30+ machines, attended the inaugural 7HA […]

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Latest GTs pose special challenges for NOx, CO catalyst system design

The state-of-the-art gas turbines (GTs), such as the H-class and J-class machines, are designed to maximize fuel-to-electricity efficiency, achieving and even exceeding 60% in combined-cycle mode. Already, there are an impressive number of these machines in the field; one supplier listed 80+ H-class GTs operating, in commissioning, being installed, or on order. This achievement is […]

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Meeting Announcement: 2019 Alstom Owners Group

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Heating-blanket technology advances

A cold steam turbine sometimes can compromise a combined-cycle plant’s ability to start up fast enough to profit from market opportunities. Several generating facilities have reported success in eliminating cold starts by installing heating blankets capable of maintaining their steam turbines in a warm condition (nominally 500F to 600F), thereby boosting revenue with faster starts […]

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7FA first-stage-bucket tip-cap inspection offers insights for condition-based maintenance

Advancements in technology generally allow you to understand more while providing the know-how to improve. Borescopes and complementary tools used for inspecting and making in-situ repairs to a buttoned-up gas turbine are a case in point. Advancements in optics and information storage have enabled technicians skilled in the use of borescopes, and having intimate knowledge […]

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SPECIAL REPORT: The venerable Frame 5

CONTENTS History in the making Sidebar 1: Two-shaft Frame 5s drive compressors, pumps, generators Frame 5 major surprise Sidebar 2: Backgrounder on CVPS Frame 5s Sidebar 3: How to remove buckets rusted into turbine discs Weak ankle Inspect regularly Controls retrofits Fuel system upgrade End-of-life inspection Make a Frame 5 generator ‘new’ in 15 easy […]

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How to make a Frame 5 generator ‘new’ in 15 easy steps

Your Frame 5 generator may be a classic—between 20 and 40 years old—perhaps even an antique (over 40). Physical age doesn’t matter much in most cases because these machines were designed conservatively, constructed with craftsmanship, and built to last. How long it pays to keep Frame 5s older than about 25 years in service continues […]

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