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Rolls-Royce Aero-Derivative Combustion Turbine Background
2-10
The 17 stage gas generator provides a compression ratio of 8.8:1 and is driven by a 3 stage
turbine. The 2 stage power turbine drives a 4-pole generator at 1500-1800 rpm, similar to the
RB211.
Although some new units are sold each year, the product line appears to be phasing out for
electrical generation applications. Rolls-Royce provides continuing support for the relatively
large existing fleet. Furthermore, several upgrades have been implemented: the swirler burner
for improved handling of liquids in otherwise gaseous fuel (similar to the upgraded diffusion
burner for the RB211), and improved components for increased power and efficiency. Even
though a DLE combustor was previously announced for the Avon, that work is apparently not
going forward. Although standardized skid-mount packages are being developed for the RB211
and Trent, the effort for a highly-engineered Avon package is not anticipated.
Unlike the maintenance schedule for the RB211 and Trent engines, the Avon is refurbished at
roughly 30,000 and 60,000 hours, while undergoing a comprehensive overhaul at 90,000-
100,000 hours. The standard turnaround time is 40 days.
Pedigree Matrix for the RB211 and Trent 60 Engines
This section provides a review of the Pedigree Matrix developed for the Rolls-Royce RB211 and
Trent industrial combustion turbine product line currently relevant for new electrical generation
projects. The Pedigree Matrix is structured to show the distinguishing characteristics of the
selected models, and the significant or major design changes from each model.
The Pedigree Matrix for the Rolls-Royce RB211-6562, RB211-6761 (Uprate), and the Trent 60
current production industrial units is provided in the following table. Items with gray
background highlight areas of significant design changes compared with previous designs from
the manufacturer.