How You BenefitThis package is applicable to V94.2 Pre Ratio Gas Turbine Models and is particularly profitable in the following cases:• Combined with Life Time Extension (100k EOH overhaul);• During any major intervention on the plant power train.

The V94.2 Pre Ratio to Ratio upgrade is a retrofit package designed for upgrading, updating and rejuvenating the early generation V94.2 Pre Ratio Gas Turbine. This solution provides operations and maintenance optimization and availability maximization, and is based on Ansaldo Energia’s knowledge and expertise in the field of Gas Turbine design, manufacturing and service. The operational experience accrued by Ansaldo Energia’s Gas Turbine fleet accounts for more than 110 units running all over the world and has accumulated over 7 million EOH. With a minimal impact on the power plant, this solution allows power plant operators to maximize their previous investments and utilize the latest design improvements, materials and coating technologies in their plants. The Utility also benefits from the introduction of standard components, which lower spare parts cost and increases availability.

V94.2 Pre Ratio to Ratio Upgrade

Customer benefits• Standardized spare parts with lead time reduction

• Availability increase (above 1%)

• Aging factor reduction (Rejuvenation)

• Remarkable reduction of maintenance costs (up to 25% savings)

• Reliability increase

• GT life time extension

teChniCal features• Availability Increase, allowing extension of the maintenance interval from 25,000 EOH to 33,000 and up to 41,000 EOH

• The V94.2 Ratio Gas Turbine can benefit from the other upgrade packages designed for standard AE/V94.2

• Lower thermal and mechanical stresses on Hot Gas Path Components (turbine section and combustion chambers)

The Pre Ratio to Ratio consists of these upgraded components: many important upgraded compo-nents such as:

Compressor Blades and VanesAnsaldo Energia can install the current design or improved version (increased stall margin) of the compressor blades and vanes for all the compressor stages.

Turbine Blades, Vanes and DiscsThe Pre Ratio to Ratio upgrade package designed conceived for the turbine section involves modi-fications to base material and coating of the bla-des/vanes and new design rotor components.Here a detail of modifications follows:

Blade and Vanes Modification details:Stator Vane Stage 1• New material: IN738• New coatings:• NiCoCrAlYSi / NiCoCrAlRe metallic coatings• Thermal Barrier Coating (TBC)• Internal Alluminising

Rotor Blade Stage 1• New coatings:• NiCoCrAlYSi / NiCoCrAlRe metallic coatings• Internal Alluminising

Stator Vane Stage 2New material: IN738 replaces IN939• New material: IN738• New coatings:• NiCoCrAlYSi / NiCoCrAlRe metallic coatings• nternal Alluminising

Rotor Blade Stage 2• New coating:• NiCoCrAlYSi metallic coating

Stator Stage 3Improved and new seal ring (Ratio version) components are fitted on turbine blade carrier with minimal modification

Stator Stage 4 Improved vanes and new seal ring

Exhaust DiffuserMinor modification on the diffuser seal ring

Inner CasingAnsaldo Energia can substitute the inner casing installed on pre-ratio models with the improvedversion currently in production.Modifications are the following:• Relocated fixation ring• Optimized cooling air path• Radiation Liner with belleville spring loaded

Combustion Chamber and BurnersHR3 burners can also be installed, with the advantage of a significant reduction of NOx emissions and an increase in flame stability.The benefits are:• TIT increase• NOx emission reduction• Premix flow stability increased• Flash back avoided

Rear Hollow ShaftThe rear hollow shaft is replaced with a new design one, tailored for the right axial position of the stage 4 turbine disc.

Technical Specifications

Ansaldo Energia, all rights reserved. Trademarks mentioned in this document are the property of Ansaldo Energia, its affiliates, or their respective owners in the scope of registration. The information contained in this document is merely indicative. No representation or warranty is provided, nor should be relied on, that such information is complete or correct or will apply to any particular project. This will depend on the technical and com-mercial circumstances. Said information is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.

AnsAldo EnERgiAVia N. Lorenzi, 8 - 16152 Genoa - Italy - Tel: +39 010 6551 - Fax: +39 010 655 3411 - info@ansaldoenergia.com - ansaldoenergia.com

For more information and to reach our sales Team, please go to www.AnsaldoEnergia.com