sst-700_epd_emghmgmn

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SST-700 Steam Turbine

Environmental Product Declaration

according to ISO 14021

Industrial Power

www.siemens.com / energy


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Sustainability as opportunity

Sustainability is the basis for how we do business

Our goal is to create value for the long term by treating

people and the environment in a responsible manner.

Innovative products and solutions are

the foundation for our success

They help our customers to achieve their business goals

while meeting global challenges such as urbanization,

demographic change, climate change and resource

scarcity.

We walk the talk

We pursue ambitious goals with regard to resource effi -

ciency and environmental protection; we see our employ-

ees as our most valuable asset and develop them for the

long term; we value a corporate culture with a strong

emphasis on integrity; and we promote education, social

issues, arts and culture wherever we operate.

Siemens aims to set the highest standards for Environ-

mental Protection. We urge our business partners to share

this ambition. We cooperate with both customers and

suppliers in an honest and open dialog in order to drive

forward a joint effort to attain continuous improvement.

The main objective of our environmental work is to

prevent pollution and continually to reduce the environ-mental impact from our activities in order to protect the

environment for future generations.

To meet these objectives, we will maintain and further

develop a culture in which reducing the environmental

impact of the product life-cycle is an integral part of our

daily work practice. Our integrated management system

for environment, health and safety, ISO 9001, 14001

and OHSAS 18001, is implemented worldwide within

the Siemens Energy Sector.

SST-700 IP turbine

at the Solnova 1 CSP plant near

Sanlcar la Mayor, Spain.


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Steam Turbines for Renewables

The replacement of fossil fuels by renewables,using e.g.

sun and biomass, and the enhancement of the conversion

efficiency of heat into electricity are the most important

challenges for the power generation industry. Siemensoffers an extensive steam turbine portfolio in order to

meet these challenges.

With over a century of experience and continuous devel-

opment in steam turbine technology, Siemens has stayed

at the forefront of development, is a leader in plant instal-

lation and a prime partner for your business.

Product stewardship: The Siemens standard SN 36350

Environmental compatibility is a cornerstone of product

design at Siemens. In 1994, we published an in-house

standard, SN 36350, to advance environmentally friendly

product design throughout the company. The standard

has since been expanded to provide product developmentengineers with a comprehensive toolbox.

Siemens SN 36350 defines standards for

environmentally compatible product and system design

handling of critical substances

packaging

declaration of substances in products

environmental product declarations.

These requirements and regulations are accompanied

by a guideline giving examples of how to implement the

standards requirements; a semi-quantitative tool for

evaluating a products environmental footprint is also

available.

The standard describes how to address the needs of

environmentally compatible product and system design

in management systems.

Environmental Product Declaration

The data in this Environmental Product Declaration (EPD)

are related to one SST-700, 50MW concentrated solar

power (CSP) steam turbine. The environmental impact is

given by the specific material footprint and by the global

warming potential (GWP) related to the product. The GWP

has been evaluated within a full scale Life Cycle Assess-

ment study according to ISO 14040.

Product description

The SST-700 is a dual-casing steam turbine with up to

175 MW power output. It is specially designed for power

generation applications. In order to make the best use

of large changes in volumetric flow from inlet to outlet,

the SST-700 turbine steam expansion is divided into two

different modules: one high-pressure turbine (HP) and

one low-pressure turbine (LP), operating at different

speeds.

SST-700 HP Turbine

module in the

German workshop.


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The two modules are combined to provide the turbine

configuration that is most suitable for a specific

application.

Optimum performance is assured by selecting an optimal

size for each cylinder appropriate to volumetric flow andby using two different and optimized speeds for the HP

and LP turbines. Internally controlled process steam

extraction provides a constant extraction pressure over

a broad range of steam flows, a feature that makes the

SST-700 steam turbines both flexible and easy to operate.

Bleed extractions are available and can be equipped with

external pressure control valves.

With a symmetrical barrel type casing and small dimen-

sions of the hot parts, resulting in low thermal and

mechanical inertia, the SST-700 turbine can accept very

short start-up times and rapid load changes.

The reliable and well proven turbine is optimized forsolar steam cycles. The latest upgrade reflects feedback

from the CSP plants already in operation and allows for

improved start-up times and higher internal efficiency.

The new design enables a double-reheat steam cycle,

which further improves the plant eff iciency.

Material allocation

The SST-700 consists to nearly 100 percent of steel,

predominantly low-alloyed steel. The following diagram

shows the material allocation of the product.

32

SST-700 steam turbine

generator set

21%

47%

32%

0.4%

High alloy steel

Low alloy steel

Non alloyed steel

Others


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70

60

50

40

30

20

10

0

59 %

32 %

7 %2%

Key Environmental Performance Indicators

Siemens uses standard life-cycle software for the evalua-

tion of the environmental impact of all product life-cycle

stages. All results are verified by internal reviews.

Global Warming Potential

Global warming is the rising of the global temperature

due to emissions of greenhouse gases such as carbon

dioxide and methane. The GWP is evaluated in CO2

equivalents.

The GWP of the SST-700 is shown in the figure above.

The diagram is separated into the four life-cycle sections

Materials, Manufacturing, Transport and Operation.

Nearly two thirds of the environmental impact of global

warming are caused by the Materials. The operational

phase, on the other hand, has no real impact on the GWP

of the product.

Environmental benefit

Concentrated solar power plants (CSP) enable mankind to

generate power without using fossil fuels. Not using fossil

fuels protects our natural resources and helps to avoid the

emission of greenhouse gases.

The SST-700 saves around 2,610kt CO2 over its lifetime

compared to the world fossil average (see calculation

below). Thus it makes a tremendous contribution to

environmental protection.

CSP plants require steam turbines which are optimized

for their complex and challenging cycle conditions. The

SST-700 meets all these environmental and technological

challenges.

Greenhouse gas emissions savings of oneSST-700, 50MW, CSP

Power generation:

3,000 GWh

in 20 years of

operation*

* referring to 3000 h of

operating per year

CO2 savings:

2,610 kt CO2

in 20 years of

operation**

** against world fossil

average of 870 kg/MWh

Global Warming Potential

End of life Recycling reduces the environmental impact of

the product and gives a positive contribution to the overall GWP

of the product (not shown).

Material Manufacturing Transport Operation


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Description of the

life-cycle stagesAn important product focus for Siemens is to minimize

the environmental impacts from resource extractionthrough to ultimate disposal. At every stage, Siemens

has developed trendsetting solutions in accordance

with sustainable life-cycle thinking.

Materials

The life-cycle stage Materials includes the

material inventory which involves the extraction

of natural resources, transport to the processing

sites and the production of raw materials.

All product materials have been chosen with

regard to minimizing environmental impact.

The SST-700 consists mainly of ferrous and

non-ferrous metals. This ensures a high degree

of recyclability.

Manufacturing and Transport

The Manufacturing section covers all production

processes up to the assembly of the finished

product at the manufacturing site. The essential

data like energy, water and gas consumption,

are based on the annual manufacturing data of

the site.

The Transportation section includes the trans-

port, mainly per sea, to the customer site. For

this LCA a customer site in the south of Spain

was assumed.

Operation

The life-cycle stage Operation covers all

environmental impacts of the described product

system during its operation phase. This also

includes the related service equipment. For steam

turbines, and therefore also for this LCA, a normal

operation time of about 20 years is assumed.

Its flexibility and inherent reliability have made

the SST-700 the steam turbine of choice for theConcentrated Solar Power (CSP) industry.

End of life

The end-of-life scenario includes the disassembly,

recycling and thermal treatment of all recyclable

materials and also the disposal of all other

materials.

Recycling reduces significantly the consumption

of primary materials. A high degree of recycl-

ability is given due to the high amount of steel

for the SST-700. In the case of steel, the recycling

rates are nearly 100%.


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All rights reserved.

Trademarks mentioned in this

document are the property of

Siemens AG, its affiliates, or their

respective owners.

Subject to change without prior

notice. The information in this

document contains general

descriptions of the technical options

available, which may not apply in

all cases. The required technical

options should therefore be

specified in the contract.

Published by and copyright 2012:

Siemens AG

Energy Sector

Freyeslebenstrasse 1

91058 Erlangen, Germany

Siemens AG

Energy Sector

Oil & Gas Division

Wolfgang-Reuter-Platz

47053 Duisburg, Germany

For more information, contact our

Customer Support Center.

Phone: +49 180/524 70 00

Fax: +49 180/524 24 71

(Charges depending on provider)E-mail: [email protected]

www.siemens.com/energy

Oil & Gas Division

Order No. E50001-E410-T116-X-4A00

Dispo 34806, bdk 110133, WS 0512

Printed on paper treated with chlorine-

free bleach.

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sst-700_epd_emghmgmn