MD&A Bearings, Seals & Hydraulics Division’s Upgrade

MD&A recently supplied an upgraded system of hydrogen seals for a customer’s 7FH2 generator located in Colombia.

Many units in the combined cycle setup, which can be comprised of two MS7001FA gas turbines and a D11 steam turbine, are also equipped with 7FH2 generators.

The customer requested an upgrade of their existing unbolted hydrogen seals to a bolted design for two of the two generators. Many units have unbolted, babbitted hydrogen seals, especially on 7FA® and D11® machines. If there’s any contamination of the oil or improper assembly, those conditions may cause the unbolted seals to tilt, which could lead to a hydrogen leakage and oil ingress into the generator.

MD&A supplied the two casings with a bolted style along with the upgraded hydrogen seals and all the hardware required. We also supplied a spare set of D11 valve parts and hardware.

For upcoming maintenance, MD&A supplied one set of 7F refurbished third stage hot section parts (including buckets, nozzles, and shrouds).

The upcoming maintenance will include a Hot Gas Path Inspection, since one of the units has reached the required number of equivalent starts, as well as, the inspection of the generator rotor & stator.

Throughout the U.S. and around the globe, MD&A provides responsive support, thorough communication, and excellent execution, making MD&A the service provider of choice for numerous power generation asset owners who desire a one-stop solution for all of their turbine-generator needs.

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 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 turbo machinery from around the world.

We can also perform generator inspection and repairs, along with providing innovative solutions to numerous aging fleet issues; for example, 7FH2 generator spring migration repair and dusting on 7FH2 & 324 stator end winding systems.

Our Parts Division is a premier worldwide supplier of replacement new and refurbished gas capital and consumable parts. Our San Antonio Service center offers gas turbine component repairs and upgraded 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.

Lastly, our Control Systems Division provides expertise to service or retrofit turbine control and generator excitation systems and their auxiliaries.

Call us today +1 (518) 399-3616 or visit our website.