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Steam Turbine

D11 Problems & Repair Solutions

D11 Bowed Rotor | D11 Problems & Repairs Solutions

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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D11 Retrofit Solutions in light of Early Life Expectancy 

D11 Retrofit

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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Steam Turbine Reheat Stop Valves Restoration

Valves Restoration

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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Onsite Seal Services Video

On-site seal services

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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Spare LPB Rotor and Diaphragm Repairs

Spare LPB Rotor and Diaphragm Repairs

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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Topless Turbine Laser Alignment

Turbine Laser Alignment

Mechanical Dynamics and Analysis’ Topless Turbine Laser Alignment ® Service eliminates the time consuming and expensive process of reassembling a steam turbine for “Tops-On” alignment measurements, saving hundreds of man-hours labor per turbine section. Most centerline alignment activities are moved off the critical path, reducing outage duration by days. Why Align? Correct bearing loading, reducing […]

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Comprehensive Industrial Outage

Comprehensive Industrial Outage

Mechanical Dynamics & Analysis (MD&A) experts recently completed a comprehensive industrial outage for a customer. During the planned major outage, the work scope included inspection and repairs of their industrial steam turbine-generator unit. The major inspection included disassembly, cleaning, inspection, performing recommended actions, and reassembly of the turbine, generator, and auxiliaries. The work scope also […]

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Combined Cycle Overhaul with our One-Stop Shop

Combined Cycle Overhaul

Mechanical Dynamics & Analysis (MD&A) recently completed an overhaul at a combined cycle plant consisting of gas and steam turbine majors, a steam turbine generator minor inspection, and a gas turbine generator major inspection. The customer combined scope was the largest single project implemented at the site since the combined cycle plant was commissioned. MD&A […]

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