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Steam Turbine

Thermodynamic Analysis on a Steam to Combined Cycle Plant Conversion

Heat Balance Example | Thermodynamic Analysis

Mechanical Dynamics & Analysis (MD&A) experts recently performed a thermodynamic analysis to assist our client in converting their coal and natural gas plant to combined cycle operation. The customer was able to locate a gray market Gas turbine and Heat Recovery Steam Generator (HRSG). Our team modeled how each component would interact with one another, […]

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MD&A Company Video

Mechanical Dynamics & Analysis is a steam & gas turbine and generator full service provider.  MD&A began in 1982 as a small engineering firm supporting power generation companies with third party consulting services.  Since its inception, MD&A has maintained an entrepreneurial culture and has focused on outstanding customer service. As a result, over 35 years later, […]

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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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Petro Vietnam’s Rapid Bearing Repair and Journal Machining

bearing repair

At Petro Vietnam Vung Ang 1 Thermal Power Plant, Mechanical Dynamics & Analysis (MD&A) experts recently repaired damaged babbitt bearings and refurbished journals for a customer on a steam turbine-generator with the unit in an assembled (rotor-in) condition. The unit was forced from service due to turbine bearing failures. In a quick turnaround, journal refurbishment […]

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Rotor Steeple Indications and Diaphragm Repairs

diaphragms repairs, Rotor Steeple

Mechanical Dynamics & Analysis (MD&A) experts recently completed steampath inspection and repair services for a customer during a major overhaul. The Alstom® steam turbine consisted of an HP/IP turbine (stages 1-15) and a single flow LP turbine (stages 16-21). A detailed incoming inspection was performed for the HP/IP and LP rotors and found relevant indications […]

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Bucket and Thrust Collar Replacement

Bucket and Thrust Collar Replacement

In a forced outage for a customer’s steam turbine, MD&A’s experts at the St. Louis Turbine-Generator Repair facility successfully replaced four rows of buckets (turbine blades) in the HP & LP sections, replaced the thrust collar, and performed other repairs on both the rotating and stationary components. This meticulous inspection, rebuild and installation illustrates how […]

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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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Structured Remaining Life Assessment

Structured Remaining Life Assessment

Mechanical Dynamics & Analysis (MD&A) assessed both the current condition and remaining life of a 1968 Vintage fossil-fired 445MW D8 steam turbine following 700 starts and 345,000 operating hours. The owner wanted to know if the asset was safe to continue to operate and if it could be considered for repowering for another twenty years […]

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Mechanical Dynamics & Analysis LLC   |   19 British American Blvd., Latham, NY 12110   |   P (518) 399-3616   |   F (518) 399-3929