501 F&G Users Group Archives - Combined Cycle Journal

501 F&G Users Group

McIntosh: HRSG mod allows an increase in backpressure to boost power output

Maximum allowable duct pressure for the HRSG in Lakeland (Fla) Electric’s (LE) McIntosh Power Plant (MPP) Unit 5 combined cycle was 28 in. of water column (in. H₂O). After 20 years of operation, pluggage of the LP economizer in the Nooter Eriksen boiler caused high backpressure on the gas turbine/generator and limited its ability to …

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Mitigation efforts to protect the through bolts on Lakeland Electric’s W501G turbine rotor

McIntosh Power Plant is home to the first W501G gas turbine to experience a turbine-rotor through-bolt failure. The utility worked closely with OEM Siemens to complete an investigation to determine the failure mechanism. While this lengthy process unfolded, the utility invested in several mitigation efforts to minimize the potential for future through-bolt failures. This best …

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Use online monitoring, NDE to monitor the condition of steam-turbine blades at McIntosh

A challenge plant staff faced was how to monitor the steam turbine/generator to determine proactively if repairs are needed. To ensure the Unit 5 steam turbine is available when the combined cycle must operate, Lakeland Electric (LE) personnel focus on preventive-maintenance activities to avoid a failure. The steamer is monitored continuously for backpressure on the …

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Welcome to outage season! Post-outage checklist for turbine owner/operators critical for success

With outage season in full swing, Greg McAuley, CTO of TRS Services and lead consultant at sister company GMW Consulting, shares his decades of industry experience below in the post-outage checklist he developed for owner/operators of gas and steam turbine/generators. Post-outage reviews and records are particularly important, McAuley says, because you already paid for the …

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Who ya gonna call the day after a ‘bump in the night’?

What do you do when your gas turbine experiences a forced outage (FO), or as Sulzer’s Jim Neurohr and Michael Andrepont put it, a “bump in the night”? Hopefully, your plant already has a plan in place for such emergencies, and they hope you’ll call Sulzer and let them put their full-service shop in LaPorte, …

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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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