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MD&A Insight

Turbine Bucket Redesign & Modification

Turbine Bucket Redesign

Mechanical Dynamics & Analysis (MD&A) performed a turbine bucket redesign & modification on a variable-speed steam turbine. The unit is an essential prime mover for a compressor/chiller. The rotor was sent to MD&A’s Turbine-Generator Repair Facility in St. Louis, MO for standard blast cleaning, NDE and visual inspection. Inspection Stage 3 L-0 stage buckets and […]

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Fuel Nozzle End Cover Insert Life Extension

Fuel Nozzle End Cover Insert

ICS (Integrated Combustion Solutions) / MD&A Fuel Nozzle Services Division can extend the service life of a Fuel Nozzle End Cover. The life expectancy of an end cover increases from the OEM claim of 48,000 hrs. to over 125,000 hrs. with a new maximum of 7 insert replacements per cover. A braze-cracking issue can occur […]

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Steam Turbine Valve Actuator Diagnostics for Predictive Maintenance

Main Stop Valve

M&DA Control Systems recently analyzed Steam Turbine Valve Actuator Diagnostics to establish a plan for Predictive Maintenance.  Hysteresis Test data was gathered and utilized to establish an in-service predictive maintenance practice. This practice has allowed the customer to optimize their unit’s operational availability while reducing their maintenance costs. The predictive approach allows savings to be […]

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Field Rewind with a Rotor Slot Dovetail Repair

Performing Rotor Slot Dovetail Repair

Mechanical Dynamics & Analysis (MD&A) recently completed generator field rewind with a rotor slot dovetail repair on a customer’s GE® 650,000 KVA generator field. The work scope was performed at the customer’s direction with regards to applicable Technical Information Letters. Incoming visual and mechanical inspections were first completed, as well as a runout inspection in […]

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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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Generator Flex Lead Replacement

Generator Flex Lead Replacement

Mechanical Dynamics & Analysis (MD&A) experts recently performed a Generator Flex Lead Replacement.  At the customer’s request, the Technical Information Letter (TIL) was completed. MD&A provided all the hardware and replaced all flexible leads. During the disassembly and replacement of all flexible leads, it was observed that some of the assemblies were too short. The […]

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