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MD&A Insight

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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Gas Turbine Exhaust Temperature Spreads

7FA.03+ upgrade

What is an exhaust temperature spread, and why is it so important to monitor and take appropriate action when an exhaust temperature spread develops? An exhaust temperature spread refers to a high differential in readings between the thermocouples placed radially around the exhaust of a gas turbine. The worst exhaust temperature spreads occur when the […]

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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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Gas Turbine Rotor Life Extension Video

MD&A’s Gas Turbine Rotor Life Extension Program provides options for your aging fleet. Our goal is to meet your operating strategy for remaining life through validation, repair, or replacement of life limiting components. View our video to see the process and then call MD&A today at (518) 399-3616 or use our Contact form.  MD&A’s Gas […]

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Gas Turbine Parts Lifetime Extension Clinic

vacuum heat treat furnace, gas turbine parts lifetime extension

Mechanical Dynamics & Analysis (MD&A) can extend the service life of gas turbine components whose OEM service limit has passed or whose configuration is no longer suitable to operate. Significant savings can be realized by opting for lower-cost repaired spares instead of new parts. Elevated temperatures take a big toll on gas turbine components. Repair […]

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New Generator Stator Replacement

MD&A recently performed a Stator Replacement, removing the old stator off the foundation and replacing it with a brand new Stator. The generator stator traveled by large vessel overseas, then by railcar to the site. In addition, the project included a full test and inspection on field, where MD&A experts rewound, applied a blocking modification, […]

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