Rolls-royce 1004227 User Manual download pdf (Page 35)

EPR Proprietary I Licensed Material

Rolls-Royce Aero-Derivative Combustion Turbine Background

2-9

The fundamental feature of the aero-derived turbine is its modularity. The industrial Trent

consists of 6 prebalanced and interchangeable modules. A module can be removed and replaced

with a module from the module pool and operations resumed without any other work being

necessary. This offers considerable benefits to a user in terms of reduced spares inventory,

increased availability, and the ability to defer refurbishment costs. Some users might choose to

send the entire engine back to a repair depot where the module changes can be made more easily.

There are over 10 units currently operating in power generation service, with at least 5 of those

in combined-cycle service. Other Trent engines have been sold for gas compression duty. At

about 40-42% efficiency, the Trent engine is currently the most efficient engine in its size

category of 50-58 MW.

The engine requires a 12 hour cool down cycle. It may use an External Heat Exchanger for

cooling air to blades and vanes.

Trent Maintenance Approach

As with the RB211, the industrial Trent engine package is designed for ease of maintenance.

Currently, all Trent engines are maintained under long-term maintenance contracts. Scheduled

maintenance occurs as follows:

• 4,000 Hour (or 6 month) Intermediate Maintenance: boroscope inspection of hot section

components

• 8,000 Hour (or annual) Annual Maintenance: boroscope inspection, plus functional checks of

gas turbine package systems and safety checks of equipment and control system

• 25,000 Hour HP/IP Core Replacement: includes annual maintenance, plus

refurbishment/replacement of worn parts and re-coating of parts as required.

• 50,000 Hour Whole Engine Replacement: includes annual maintenance, plus a total engine

strip and refurbishment of all parts, which extends engine life through a second 50,000 hour

interval.

Modules can be swapped out in the field in as little as 72 hours. The unit can be easily split into

3 portions: the LP compressor, the HP/IP core, and the LP turbine.

Avon Background Information

The industrial Avon engine, introduced in 1964, has seen more than a 44% increase in power

rating and improvement of over 14% in efficiency in the last 40 years. The current model, the

Avon-2656, produces 15.6 MW at 30.3% efficiency. Cumulatively, the Avon in its various

applications has more than 1,200 installed units with over 53 million operating hours. In

electrical power generation, there are approximately 529 units with over 11 million operating

hours. A recently announced upgrade will provide an additional 6-8% capacity and about 3

percentage points higher efficiency.

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Rolls-royce 1004227 User Manual Page 35