Pre-rotation Drive Upgrade
Reduce energy consumption on
“S-type” compressors
Energy savings between 6 - 15% are not
uncommon when upgrading an S-type
HV-Turbo compressor with a variable inlet
guide vane system (type SV).
The achievable savings depend on local
conditions and individual plant structures,
however under these operating conditions
you will benefit mostly from an upgrade:
 Where you have variation in the inlet air
temperature
 Where you have variation in the
required outlet air pressure
 Where you have variation in the
required air flow
Key advantages
 Potential for substantial energy savings
 Return on investment can be as low as 1
to 2 years
 Process improvements through new
optimized regulation system
 High degree of automation is possible
reducing the need for operator
intervention
All of the above is of highest interest in a
market with ever rising energy prices and
environmental interest and awareness.
The SV upgraded compressor is capable of
self adjustment to different operating
conditions and will therefore operate with
high efficiency in a much broader
temperature, pressure and flow range.
Plant analysis
In order to estimate the savings potential
at your particular site we offer a cost &
efficiency analysis to be performed by our
skilled engineers. Following the cost &
efficiency analysis we will give our
recommendation to conclude whether an
upgrade would be beneficial for your plant.
If you can profit from an upgrade, we will
ork out an individual offer for you
adapting to your specific needs.
The variable inlet
The variable inlet guide vane system makes
it possible to control the airflow into the
impeller by adjusting nonsymmetrical
airfoils that are located radically in the
ompressor inlet.
Adjusting the angle of the airfoils creates
pre-rotation in the air flow into the impeller.
This boosts the efficiency throughout the
regulating range, with only insignificant
throttling losses.
How is it possible?
Your existing S-type HV-Turbo compressor
was designed for operation under one set
of ideally specified conditions, that is one
optimal design point. Under real life
conditions however, all S-type compressors
operate away from the ideal design point,
and the further away from the design point
you operate, the larger savings can be
achieved with the SV upgrade kit.
Answers for energy.
Before upgrade (S)
After upgrade (SV)
The upgrade
Other beneficial offerings when
upgrading
A typical upgrade will comprise of:
As your compressor would be upgraded
and tested in our works, it could be
beneficial to consider the following
additional options:
 The variable inlet guide vane unit
 A new local control panel
 The latest software version for the
localcontrol panel
 Complete inspection & service of the
compressor
 A documented performance- and QA
test prior to shipping proving theoretical
calculated performance values
 Refurbishment of your compressor
according to individual needs
 One set of user documentation
The savings (exemplified)
Compressor type: KA10
310
300
40
Power consumption, S-type
35
Power consumption, SV-type
(with pre-rotationdrive)
Power consumption
(kW)
25
280
20
270
15
260
10
250
Average monthly air temperature
(Deg. C)
30
290
Inlet air temperature
(monthly avarage day temperature)
Energy saved
5
240
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The curves are based on the following
performance data:
 Mass flow:
13,000 Nm3/hour
 Discharge pressure: 1.7 bar
Published by and copyright © 2008:
Siemens AG
Energy Sector
Freyeslebenstrasse 1
91058 Erlangen, Germany
Siemens Power Generation, Inc.
4400 Alafaya Trail
Orlando, FL 32826-2399, USA
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
 Operating haurs:
8,400 h/year
Under the preconditions given in this
example, the result will be:
Potential saving ~ 243,000 kWh/year
To learn more about the energy savings
pontential for your “S-type” compressor,
please contact our Customer Service or
your local Siemens representative.
Order No. A96001-S90-B286-X-4A00
Printed in Denmark
1386 P DA 0508 .5
All rights reserved.
Subject to change without prior notice.
Printed on paper treated with chlorinefree bleach.
Trademarks mentioned in this document are the property of Siemens AG,
its affiliates, or their respective owners.
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.
For more information please contact:
Siemens A/S
Turbomachinery Solutions
Allegade 4
DK-3000 Helsingør
Denmark
Phone: +45 49 21 14 00
Fax: +45 49 21 52 25
At Siemens Turbomachinery
Solutions, we strive to provide the
best service to our customers.
Therefore, you will always get solutions
and service products designed to suit
your individual needs.
We can assist you with everything from
spare parts and training to refurbishment
and upgrades of old equipment and
maintenance of existing installations.
You can choose between a wide range
of service solutions:
 On-site or off-site training
programmes
 Process optimization consultancy
 Refurbishment of existing
equipment
 Service contracts relating to
equipment