Our top priority at Siemens is to provide outstanding, responsive service solutions to help you improve your operating plant competitiveness and profitability. As part of our ongoing commitment to meet the changing requirements of your operating assets, we offer the latest technology to help to enhance your operating plant capability and flexibility as part of Siemens Flex-Power ServicesTM. One of our moderni -zation products is the Turn Down upgrade.

Siemens offers the Turn Down upgrade as an innovative solution designed to further reduce the compressor mass flow at part load and therefore to reduce the minimum part load where carbon monoxide emission requirements can be met.

Our productThe implementation of the Turn Down upgrade is de-signed to help increase efficiency for combined cycle plants in part load operation with a reduced minimum part load, lower carbon monoxide emissions and almost constant gas turbine exhaust temperature at a high level. The resulting expanded operating range is achieved by decreasing the compressor mass flow with increasing the adjustable range of the inlet guide. The actual minimum part load depends on your site specific conditions and the desired carbon monoxide emission level. The high turbine exhaust temperature level allows the steam turbine to be in operation with optimum efficiency.

The Turn Down upgrade can provide significant perfor-mance advantages and offer attractive financial payback options.

siemens.com/power-generation-services

Turn Down modification

Performance Enhancement – Gas Turbine

Flex-Power ServicesTM

Turn Down Upgrade for Siemens Gas Turbines

3

Emissions

Aspects of Flex-Power ServicesTM

Grid

Service

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Part Load

Maintenance

Flexibility

Power on

Demand

Start & Stop Performance

Peak

Pow

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Load Gradients

Intervals &

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Published by Siemens Energy, Inc. 2016Siemens Energy, Inc.

4400 Alafaya TrailOrlando, FL 32826, USA

Order No. PSCG-T10001-01-4A00Printed in USABU 14286T IN 0816.025

Subject to changes and errors. Theinformation given in this document onlycontains general descriptions and/orperformance features which may not alwaysspecifically reflect those described, or whichmay undergo modification in the course offurther development of the products. Therequested performance features are bindingonly when they are expressly agreed upon inthe concluded contract.

Your benefitsThe Turn Down upgrade can offer you a technical and monetary quantifiable benefit and can be a cost-effective means to help you improve the overall perfor-mance of your gas turbine plant.

The Turn Down upgrade can include the following benefits:◾ Reduced minimum part load with lower

carbon monoxide emissions at partload (depending on site specific config-uration and desired carbon monoxideemission level)

◾ Increased combined cycle efficiencyin part load operation

◾ Lower fuel consumption (cost) duringnegative spark spread operation

Scope of supplyThe Turn Down upgrade from Siemens is just one of the many innovative packages available.

The scope of this upgrade includes:◾ New linearization unit for

Inlet Guide Vane◾ New Inlet Guide Vane position sensor

with extended operating range◾ Modification of Inlet Guide Vane ring

(including new scale and new boltsfor bearing blocks)

◾ Detailed engineering and implementa-tion of instrumentation and controlsmodifications related to the gas turbine.

The Turn Down upgrade may be com-bined with other modernizations such as the Hydraulic Clearance Optimization. The Turn Down upgrade is applicable for the SGT5-4000F (V94.3A) and SGT6-4000F (V84.3A) and is state-of-the-art for new Siemens gas turbines of the SGT5-4000F (V94.3A) since July 2005. We recommend a major outage for implementing the Turn Down upgrade. We offer a full range of field service capa-bilities to help you manage your mainte-nance and outage schedules.

ReferencesSince 2003 (first time application) more than 120 units are in operation world-wide with the Turn Down upgrade and have logged more than 2,500,000 equiv-alent operating hours (EOH). Several units of frame type SGT5-4000F (V94.3A) and SGT6-4000F (V84.3A) have been ret-rofitted worldwide:◾ Two units in South Korea◾ One unit in Belgium◾ One unit in Germany◾ One unit in New Zealand◾ One unit in Spain◾ One unit in United Kingdom

We provide products and servicesto support your goal of maximizingyour return on investment.

A higher turbine outlet temperature at part load can lead to increased combined cycle efficiency and reduced emissions

Potential Benefit through increased power range

OTCBase Load OTCPart Load OTC

(˜constant)OTC = correct turbine outlet temperature CO = carbon monoxide Conceptual illustration only – actual results and experience may vary

Power

CO = constant

Inlet guide vane fully closed with Turn Down

Change

OTC

Use Turn Down

CO Limit

without Turn Down

with Turn Down

Inlet guide vane fully closed without Turn Down

Inlet guide vane fully open