501 F&G Users Group

501F exhaust-system repairs never ending? Replace to eliminate the problem

Exhaust systems are a presentation and/or discussion topic at most gas-turbine user-group meetings, particularly those supporting F-class and the more advanced frames. Cracking of components, broken struts, material distress, and leaks at joints are almost sure to occur in virtually any system handling a 1000 lb/sec or more of turbine exhaust at 1000F or higher …

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Attention to detail early in the HRSG lifecycle sets the tone for long-term reliable service

The first five years of HRSG operation are critical for building the foundation necessary to assure a reliable and satisfactory service life, said engineers from HRST Inc participating in an editorial roundtable with CCJ staff. In the early years, they continued, control and organization of supplier documentation will benefit current and future decision-making. Plus, timely …

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Factor European experience into O&M practices at US combined cycles, Part II: Aberrant P91 life predictions

At European Technology Development Ltd’s International Conference on Power Plant Operation and Flexibility, held in London in July 2018, ETD’s Dr Ahmed Shibli, the conference organizer, and David Robertson tag-teamed an in-depth presentation on life-prediction concerns for aberrant P91 components often found in electric generating stations worldwide. They are usually the product of not understanding …

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HRSG Tip of the Month: November 2018

How best to replace an HP evaporator: Tubes only or entire harp? Editor’s note: Online forums hosted by independent users groups are an invaluable communications medium for sharing experiences among industry colleagues. Power Users, which sponsors user-only discussion forums for the groups it manages—7F, Combined Cycle, Generator, and Steam Turbine—most recently launched an online HRSG …

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Special Report: Ovation Users Group 2018 meeting

More tools, more features, fewer connections: Ovation scope expands There were reasons why David Farr, chairman/CEO of Emerson Corp, parent to Emerson’s Power & Water Solutions (PWS) business, delivered the opening address at the annual Ovation Users Group Conference, held in Pittsburgh, July 29 – Aug 2. At least one could speculate, reading between the …

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501F users share best practices with colleagues

The 501F fleet was recognized by peers with five Best Practices awards in the 2018 judging. The annual program, sponsored by CCJ, has as its primary objective recognition of the valuable contributions made by owner/operator personnel to improve the safety and performance of generating facilities powered by gas turbines. In this section, 501F plants share …

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Reflecting on the presentations at the Distributed Energy Conference

From central to distributed: The inflection point still not clear At the Distributed Energy Conference in Denver, Oct 15-17, 2018, one of the electric-power industry’s top analysts came away with the sense that the “inflection,” marking the point at which investment in distributed assets grows faster than that in centralized assets, hasn’t yet arrived. And …

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PD monitoring helps guide stator-winding maintenance

Progress has been made in making online partial discharge (PD) monitoring technology a viable method for assessing the condition of motor and generator stator-winding insulation. Problems have been identified on many machines and maintenance was possible to slow down or correct the problem before failure occurred. To gain this acceptance, earlier skepticism of the usefulness …

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Crowded field: All four major OEMs compete for 501F business

Ansaldo/PSM PSM’s four-hour session at the 2019 501F Users Group meeting incorporated presentations on the vendor’s product line, combustion options, airfoils and upgrades, plant optimization, and rotor solutions, as well as other topics. The product portfolio was reviewed first. Highlights included the following: PSM said it can supply all hot-gas-path (HGP) parts for the 501F. …

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501F user discussions, presentations cover from air inlet to exhaust

The compressor session that launched the user portion of the 2019 501F meeting touched on several topics of interest to the group, including the following: Complications with the re-installation of outlet guide vanes (OGV) surprised many attendees. The OEM installed the airfoils backwards, something most plant personnel didn’t think was possible. A clue that something …

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