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STC-DO Siemens Turbo CompressorEnvironmental Product Declarationaccording to ISO 14021

Compression & Solutions

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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.

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Environmental Technology

Increasing worldwide water consumption combined with the effects of climate change affecting water scarcity in regions throughout the world mean that the treatment and reuse of water is becoming ever more important. Siemens offers an extensive range of aeration and water treatment solutions which not only address the need to provide cost effective, reliable water solutions, but which also improve the efficient use of one of the worlds most important resources.

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 development engineers 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 stan-dard’s requirements; a semi-quantitative tool for evaluat-ing a product’s 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 STC-DO (5SF-A), a compressor for waste water treatment. 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 Assessment study according to ISO 14040.

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Material allocation

The STC-DO (5SF-A) consists to over 80 percent of ferrous and non-ferrous metals, predominantly un-alloyed steel. The diagramm shows the corresponding material allocation.

n Unalloy steeln Cast ironn Insulation materialn Aluminium

n Low alloy steeln Coppern High alloy steeln Plastics

32

44%

22%

3%3%

3%

10%

9%

Product description

The STC-DO (5SF-A) combines a 200kW compressor core unit with the entire package of instrumentation and sup-port equipment as shown on in the picture. The aeration blower is suitable for waste water treatment plants, for fermentation applications and other biological processes. This compact blower uses a centrifugal compressor stage with a pressure ratio up to 1.1 bar (at 20°C, 80% RH and barometric pressure of 1,013 bar). The variable speed drive and adjustable diffuser vanes enable a high effi-ciency over a large operating range (Dual PointTM Control). Air foil bearings replace the traditional ball-or journal bearings.

n Electronicsn Others

Single stage direct drive centrifugal core compressor with Synchronous permanent magnet motor and airfoil bearings (STC-DO 5SF-A)

2%2%

2%

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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 STC-DO (5SF-A) prior to the operational phase is shown in the diagram.

As aeration is an energy consuming process the opera-tional phase dominates the life cycle. Related to the whole life cycle the operational phase would be responsible for up to 99% of the GWP.

It is also for that reason that Siemens sets a high value on the development of very high efficient products and solutions.

The STC-DO (5SF-A) meets all these environmental and technological challenges.

Environmental benefit Traditional geared centrifugal compressors driven by an conventional electric motor have been used for aera-tion in waste water treatment plants. These units use lubrication oil for the gears and bearings. For the STC-DO (5SF-A) the gear box was replaced with a direct drive high speed electric motor running in air bearings. The application of airfoil bearings results in exceptionally long life with minimal maintanance since no lubricating oil is required.

Compared to a similar compressor with conventional bear-ing technology the STC-DO (5SF-A) avoids the consump-tion of over 2100l* lubrication oil over its lifetime.

*based on base load operation and 15 years assumed lifetime

60

50

40

30

20

10

0

5%

58%

Material

37%

Manufacturing Testing

“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).

Global Warming Potential

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Description of the life-cycle stages An important product focus for Siemens is to minimize the environmental impacts from resource extraction through 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 mate-rial 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 the environmental impact.

The STC-DO (5SF-A) consists mainly of ferrous and non-ferrous metals, which ensures a high degree of recyclability.

Manufacturing & TestingThe “Manufacturing” section covers all production processes up to the assembly of the finished prod-uct at the manufacturing site. The essential data like energy, water and gas consumption are based on the annual manufacturing data of the site.

The “Manufacturing” section also includes the transportation efforts, mainly per sea, to the cus-tomer site. For this LCA a customer site in the US was assumed.

The environmental impact is covered by the “Testing” section.

Before leaving the factory each compressor is mechanically and functionally tested in our advanced test rig in accordance with our Stan-dard Shop Test Specification.

Operation The operational phase covers all environmental impacts of the described product system during its operation phase. For this LCA the environmen-tal impact was evaluated on the basis of one STC-DO (5SF-A) running within a waste water treat-ment application with an assumed operating time of about 15 years. However, the STC-DO (5SF-A) can also be used within other applications.

By using air bearings oil as a lubricant is not needed.

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 recyclabil-ity is given due to the high amount of steel for the STC-DO (5SF-A). In the case of steel the recy-cling rates are nearly 100%.

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

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: support.energy@Siemens.com www.siemens.com/energy

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