This was a pollution control modification that required machining of key components, including the turbine case, combustion wrapper, and compressor discharge case for an Oregon-based power plant. The overall goal is to reduce nitrous oxide and carbon dioxide emissions when running at lower loads. Our team machined the turbine parts to precise specifications and completed the project within the shutdown schedule.
Project:
- Parts: Gas turbine case, combustion wrapper, and compressor discharge case
- Dimensions: 8′ long x 4′ wide turbine case and 8500 lbs; 6′ long x 4′ wide combustion wrapper and 5500 lbs; 7′ long x 4′ wide compressor discharge case and 7000 lbs.
- Customer: Natural gas utility company
Challenges:
- Custom tooling had to be manufactured including aluminum angle blocks and jig pins and plates.
- Critical timing. All machining and repairs must be completed within the customer’s shutdown timeline.
Engineered Solutions:
- Custom layout and dialing in each hole location.
- Drill and bore 1.756″ each hole (21 total) in the upper ExB frame down to cooling slot and machine bottom surface of hole flat for J-tube plugs.
- Drill and tap (21) each, 1/4 – 20 UNC holes in the upper ExB frame for J-tube lock plates.
- Install customer-supplied J-tube plugs and lock plates.
- Drill 4 holes, each with 4.410″ diameter in the top half of the wrapper case. Field machine lower case.
- Machine axial case seam in upper half of wrapper case.
- Pick up and deliver turbine case, wrapper case, and cdc to and from field site to meet project timeline expectations.
Results:
- All components were machined to precise specifications.
- All machining and repaise were completed within the customer’s shutdown timeline.
