Combined Cycle

Mechanical Dynamics & Analysis (MD&A) provides power generators around the globe with a full-service, OEM-alternative for services, parts, and repairs for Gas Turbines, Steam Turbines and Generators. For over four decades, our commitment to excellence has earned customer trust for all combined cycle turbine-generator needs. We focus on delivering consistent quality and value with fast response, superior communications, and innovative solutions.

Gas Turbines

MD&A’s Gas Turbine Services project managers and technical directors are seasoned professionals with a broad range of experiences whose skill sets cover both common and unique makes and models of turbomachinery from around the world.

Our specialized services range from Combustion, Hot Gas Path, and Major Inspections, as well as, Compressor & Turbine Rotor Repairs to Plant Performance Testing and Analysis. Our capabilities also include providing gas turbine internal alignment, along with vibration analysis and balance (low-speed & high-speed.)

We offer full capabilities for your gas turbine rotor maintenance/ repair and end-of-life assessment. Our engineers strictly follow effective, time-tested principles that produce sound and superior repair solutions

MD&A Parts Division is a premier worldwide supplier of replacement new and refurbished gas capital and consumable parts.  MD&A Bearings, Seals, and Hydraulics Division specializes in gas turbine and generator bearings repairs, along with Rexroth® hydraulic actuators.

Our Gas Turbine Parts Service Facility called San Antonio Service Center, is an industry leader in gas turbine component repair and offers gas turbine parts such as 7FA parts, 7EA parts, and V class parts.  Our facility and team have leading-edge equipment and repair techniques with proven expertise on multiple frame gas turbine hot gas path and combustion components.

MD&A Fuel Nozzle Services is a worldwide leader in the repair and refurbishment of Multiple-Frame gas turbine fuel nozzles, including standard, Multi-Nozzle Quiet Combustor (MNQC) and Dry Low NOx System (DLN) 1.0, 2.0 and 2.6 for industrial and power generation customers.

Case Study Examples: Gas Turbine Parts Lifetime Extension Clinic
Coordinated 7FA Hot Gas Path and 7FH2 Generator Inspection and Repair
Frame 5 Gas Turbine Rotor Repair
Fuel Nozzle End Cover Insert Life Extension

Steam Turbines

For over four decades MD&A has proudly offered comprehensive refurbishment of steam turbine-generators.

Our MD&A Turbine-Generator Repair Facility centrally located in St. Louis, MO, includes steam path services, generator services, field machining, steam turbine valves, and a brand new high-speed balance facility.

We specialize in Stationary Component Repair and Rotating Component Repair, including Rotor Straightening and Casing Renovations.  Quality, attention to detail, and on-time delivery are the cornerstones of our success.

MD&A’s technical directors, project managers, alignment engineers, and all our Outage Services’ supporting divisions are available 24 hours a day. Qualified, experienced, knowledgeable experts; we employ seasoned professionals. Our mechanical engineers are specialists in turbine-generator engineering, thermodynamics analysis, steam path audits, distortion correction, Remaining Life & Finite Element Analysis, and the many diagnostic and engineering service disciplines.

MD&A Parts Division is a premier worldwide supplier of replacement new and used steam capital and consumable parts  MD&A Bearings, Seals & Hydraulics Division specializes in steam turbine bearing repairs with quick delivery, such as Tapered Land Thrust and Tilt Pad Thrust.

Case Study Examples:  Steam Turbine Advanced Sealing System
Thermodynamic Analysis on a Steam to Combined Cycle Plant Conversion
Casing/ Shell Weld Repairs & Re-Rounding
Rotor Steeple Indications and Diaphragm Repairs   

Generator Repair & Services

MD&A provides comprehensive refurbishment & repair of large utility generator stators and fields, including high voltage bushing refurbishment and the complete rewinding of inner liquid-cooled generators.

Our turbine-generator repair facility centrally located in St. Louis, MO can accommodate generator field rewinds of any capacity, including large 4-pole nuclear units.  Our generator experts can also perform a stator rewind on-site.

Through years of power generation industry experience, our generator repair specialists conduct full-scope electrical testing, visual inspections, and specialty tests as per customer requirements.

Our generator in-situ inspection robot, MD&A’s Air Gap-Bot, can perform full generator inspections without removing the field, saving time on the outage.

We invest heavily in the development of people, procedures and principle which facilitate improvements in design, reliability, and performance.  Our generator experts designed many solutions to numerous aging fleet issues; for example, 7FH2 generator spring migration repair and dusting on 7FH2 & 324 stator end winding systems.

Case Study Examples: Field Rewind with a Rotor Slot Dovetail Repair
Comprehensive Generator Stator and Field Rewind
Generator Rotor Slot Tooth Weld Repair
Emergent Generator Re-wedge


Our Turbine and Generator Controls Division provides expertise to service or retrofit turbine control and generator excitation systems and their auxiliaries.  We specialize in custom solutions and independent advice based on individual gas or steam turbine requirements from electronics to systems maintenance.

Case Study Examples: MD&A IBECS® – The Integrated Solution to Power Plant Control and Monitoring
Generator Automated Hydrogen Purge Package
Co-Gen Turbine Controls Retrofit
Regular Inspections Key to Efficient Operations with an EX2100e Static Exciter

Check this case study out: Combined Cycle Overhaul with our One-Stop Shop

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