In-Place Stationary Shaft Machining Capabilities

MD&A continues to enhance our “one-stop shop” capabilities for customers, most recently through the addition of in-place stationary shaft machining.

In-place stationary shaft machining allows MD&A to repair damaged journals, collector rings, and seal areas without removing turbine and generator rotors from the unit. The compact setup easily fits under LP hood radii to allow for machining along the complete rotor train.

Saving you time and money, this capability eliminates unnecessary downtime. Advantages include:

Cost Effective:

  • Reduction in crew size, as disassembly is limited to removal of outer bearing cover and Babbitt bearing.
  • Shorter schedule duration.

Lay down area reduction:

  • Portable lathes occupy valuable space on a turbine deck, whereas stationary journal equipment requires only three standard gang boxes.
  • Repairs can be performed with the rotor left in the unit.

Time Constraints:

  • Most stationary journal repairs can be completed in three to four shifts, start-to-finish.
  • Reduces schedule impact by eliminating disassembly & reassembly of the steam turbine.

stationary shaft machining

Our technicians have 20+ years of experience with in-place stationary shaft repairs.

MD&A experts first perform a complete Foreign Material Exclusion (FME) of the bearing standard to ensure metal shavings do not enter the lube oil system and the packing gland is sealed to prevent intrusion of foreign contaminants.

Diametrical measurement inspections and concentricity sweeps are then completed, and findings are discussed with the customer prior to machining.

Next, the honing and polishing process is performed – surface finishes up to 2Ra are achievable. The concentricity of the journal is checked throughout honing process to maintain centerline.

The machining process allows for a perfect blend of newly machined diameter to the existing radius.

We also offer Babbitt bearing restoration in our facility upon completion of shaft machining, to accommodate for the new diameter.

MD&A can currently accommodate shaft diameters from 9 – 24 inches with additional sizes supported when the schedule allows. This new service increases our ability to respond quickly to our customers’ ever-changing needs.

MD&A continues to invest in new capabilities that enable us to expand our quality service and repair offerings. Our commitment to excellence has earned customer trust for all turbine-generator needs. We focus on delivering consistent quality and value with fast response, superior communications, and innovative solutions.

For additional information, call MD&A’s Turbine-Generator Repair Facility today at (314) 880-3000 or use our Contact form.

stationary shaft machining

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