Frame 7E/EA
Power Systems Manufacturing has been supplying Frame 7B, 7E & 7EA hot gas path buckets and shrouds since 1999. In 2014 we introduced the full gas turbine nozzle range to our 7E/EA product offering as well as supplying compressor hardware. We achieve improved durability and lower life cycle costs on our Frame 7E and Frame 7EA gas turbine parts by using PSM’s component and system level product modeling and data evaluation tools, to identify the issues and failure modes in current OEM designs.
PSM manufactures all 7E and 7EA gas turbine buckets, nozzles and shroud blocks to be compatible with the latest 2055F firing temperature machines – Engine Model 7121 – and are also backwards compatible down to and including the 7B engines. In normal operation the entire 7E and 7EA hot gas path has a minimum service interval of 24,000 FFH or 1200 FS, which can be increased on a unit by unit basis, with consultation from PSM’s experts.
Design Improvements
1st Stage Nozzle
- Equivalent to OEM
- Optional NiCoCrAlY & TBC Coatings
1st Stage Buckets
- Improved cooling through 12 radial stem drill airfoil cooling holes
2nd Stage Nozzle
- Equivalent to OEM
2nd Stage Buckets
- Scalloped tip shroud for improved creep resistance
- Increased tip shroud contact face area mitigates shingling
- Compatible with and without shroud block honeycomb
3rd Stage Nozzle
- Equivalent to OEM
3rd Stage Buckets
- Increased tip shroud contact face area mitigates shingling
LEC
LEC III™: Field proven 3-5ppm NOx
and
LEC-NextGen: Highly durable sub 9ppm NOx
Compatible with 6581B, 7121EA, 9171E and older turbine models either as a drop in replacement to the OEM DLN1.0 or as a conversion from standard diffusion frame systems. The system has proven versatility with over 70 installations globally on GE Frame 6B, 7E/EA, 9E and most recently 4 x 7B units. Originally fielded in 2001, the patented LEC III™ fuel air mixing technology produces consistent sub 5ppm NOx and single digit CO.
Introduced in 2015, the LEC-NextGen has been developed from the original LEC-I and LEC III™systems in response to the global power generations requirements for increased durability throughout an increased load range, while maintaining sub 9ppm NOx and single digit CO throughout pre-mix operation.
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