Mechanical Dynamics & Analysis (MD&A) has successfully utilized specially designed equipment for HP Rotor in-place machining to effectively repair a damaged steam turbine rotor, resulting in substantial savings in both cost and time. The high-pressure (HP) section of a 320 MW Alstom® STF30 steam turbine was severely damaged. Over time, the rotor’s shaft end at […]
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Hermiston Generating Plant For Hermiston Generating Plant in Oregon, Mechanical Dynamics & Analysis (MD&A) completed a complex, multiple-component combined-cycle major inspection and overhaul project that successfully brought both turbines and both generators back to full and reliable operations. The 474 MW combined-cycle plant was depending on the complete and efficient renewal of its Unit 2 […]
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Mechanical Dynamics & Analysis (MD&A) recently performed a steam turbine major inspection and repair service on a GE® G10 steam turbine in the Philippines. Initial inspection revealed numerous deficiencies that needed to be remedied. Outage consisted of High Pressure/Intermediate Pressure (HP/IP) turbine section major inspection, HP control valves #3 and #4 inspection, and the left-side […]
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The common GE® D11 steam turbine, a single-casing HP/IP design used extensively in combined cycle applications, is demanding increased focus during normal outages, and ongoing attention for reliability, efficiency, and plant safety. Fundamental reasons are intensified by market-driven calls for continued cycling and low-load operation. Units modified for higher efficiencies and compatibility with 7FA Gas […]
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Relative to historical industry experiences, D11 steam turbines have come of age at an early stage in their lifecycle and are strong candidates for retrofit solutions. The most common reasons reported to MD&A for prompting retrofit consideration include (1) reliability issues, (2) technology obsolescence, and (3) changes within plant operating missions and steam cycles (e.g. […]
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Mechanical Dynamics & Analysis (MD&A) performed a complete reheat stop valves restoration along with one LP stop valve. These RH stop valves on a Siemens Westinghouse® unit had not been fully restored for 14 years. Pre-outage planning took place between our team and key plant personnel. Upgraded valve materials were designed and manufactured, and […]
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MD&A’s highly skilled technicians perform custom installations of packing rings and tip seals on-site using a unique mobile containerized machine shop. Our seal services installation process ensures optimal clearances, maintains design efficiency, and reduces the likelihood of vibration due to seal rubs. View the video on the advantages of our custom fitting of packing and […]
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Seals within a steam turbine serve a very important purpose: to prevent steam from leaking between the rotating and stationary components and to keep air out. Learn about MD&A’s Advanced Sealing System with two successful case studies. Over time, seals deteriorate, and components become distorted. This could lead to excessive clearance, which reduces turbine efficiency. […]
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Steam turbine experts at Mechanical Dynamics & Analysis (MD&A) have completed LPB rotor and diaphragm repairs of a spare 410 MW GE® G2 design unit. The site had removed the crossover and outer shell to find severe damage and missing blades in the turbine’s low-pressure section. MD&A was contracted to inspect the spare LPB (low-pressure […]
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