Compression & Solutions
STC-DO Siemens Turbo Compressor
Environmental Product Declaration
according to ISO 14021
www.siemens.com / energy
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 efficiency and environmental protection; we see our employees 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 Environmental 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 environmental 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 standard’s requirements; a semi-quantitative tool for evaluating 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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Single stage direct drive centrifugal core compressor
with Synchronous permanent magnet motor and
­airfoil bearings (STC-DO 5SF-A)
Product description
Material allocation
The STC-DO (5SF-A) combines a 200kW compressor core
unit with the entire package of instrumentation and support 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 efficiency over a large operating range (Dual PointTM ­Control).
Air foil bearings replace the traditional ball-or journal
bearings.
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.
3%
32 3%
3%
2% 2%
2%
9%
44%
10%
22%
n Unalloy steel
n Cast iron
n Insulation material
n Aluminium
n Low alloy steel
n Copper
n High alloy steel
n Plastics
n Electronics
n Others
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Key Environmental Performance Indicators
Siemens uses standard life-cycle software for the evaluation 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.
Global Warming Potential
60
58%
50
37%
40
30
20
10
5%
As aeration is an energy consuming process the operational 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 aeration 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 e
­ lectric 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 bearing technology the STC-DO (5SF-A) avoids the consumption of over 2100l* lubrication oil over its lifetime.
0
Material
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).
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*based on base load operation and 15 years assumed lifetime
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 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 the environmental impact.
The STC-DO (5SF-A) consists mainly of ferrous
and non-ferrous metals, which ensures a high
degree of recyclability.
Manufacturing & Testing
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 “Manufacturing” section also includes the
transportation efforts, mainly per sea, to the customer 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 Standard Shop Test Specification.
Operation
The operational phase covers all environmental
impacts of the described product system during
its operation phase. For this LCA the environmental impact was evaluated on the basis of one STCDO (5SF-A) running within a waste water treatment 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 recyclability is given due to the high amount of steel for
the STC-DO (5SF-A). In the case of steel the recycling rates are nearly 100%.
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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
Oil & Gas Division
Order No. E50001-E420-T129-X-4A00
Printed in Germany
Dispo 34806, bdk 120134, WS 0512
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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.