Compression solutions
STC-GC Siemens standardized
integrally geared turbocompressor
The economic solution for high efficient air separation
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Main air compressor for
an ASU in a steel plant
The economic solution for high
efficient air separation
STC-GC Siemens Turbocompressor – ­Standardized Integrally Geared,
Compact Design
Siemens integrally geared centrifugal turbocompressors
are designed to answer today’s market and technical
needs with highest quality standards. The STC-GC product
line is the compact and standardized version of the
customized integrally geared compressor series STC-GV.
Invented more than 60 years ago, the traditional STC-GC
compressor series covers volume flows up to 120,000 m³/h.
This range of compact integrally geared compressors is
also available as high pressure version STC-GC (H).
To better meet the requirements of customers in air separation, the existing compressor range has been extended
with additional five frame sizes for air volume flows from
120,000–400,000 m3/h capacities. 80% of the machine
consists of standard components which results in a smart
spare part management: 20% of the machine can be sufficiently adjusted for specific customer process needs.
Highlights
The perfect match for economic
air separation
Standardized, compact and
reliable design
60 years of experience
Fields of application
Air separation
Process air
Plant air
Process nitrogen
Unique in the market, Siemens is the only compressor
manufacturer who also develops and supplies proprietary
gear technology, manufacturing compressor and gear out
of one hand and at the same location.
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Economic compressor solution
The standardized design of the STC-GC product line combines major advantages such as high efficiency, reliability
and compact design with shorter delivery periods and lower
investment costs. Several different frame sizes and a wide
range of options form the ideal basis to offer a very costeffective integrally geared centrifugal compressor in a compact single-lift unit. More than 150 units of this compressor
type are in operation at customers around the globe.
Powerful, robust and reliable
The STC-GC integrally geared centrifugal compressors
feature a multi-shaft arrangement with different speeds.
All shafts are mounted in maintenance-free, pressurelubricated sleeve bearings. With up to four compressor
stages around a central bull gear, the STC-GC compressor
series forms a compact unit for the multi-stage compression of air and nitrogen.
Pre-designed gears, highest efficiency impellers, tailored
aerodynamics and pre-defined auxiliaries lead to maximum performance.
Control Systems
Perfect protection and process control via flexible ­Siemens
control systems:
Anti-surge protection
Performance control
Fully- or semi-automatic start-up and shutdown
sequences exactly matched to your process demands
Certified safety systems available
STC-GC (10–100)
Volume flow: 10,000–120,000m3/h
The dynamic environments in the industrial gases market
require flexible and sustainable solutions to meet process
needs. Whilst plant capacities are permanently growing,
there is another trend in increasing standardization of air
separation units. Typical outputs are up to 2,000 tpd of
oxygen.
Siemens reached a step further in customer satisfaction
with the introduction of a highly standardized compressor
series STC-GC (165–400) of integrally geared machines
for main air applications. This extended range of STC-GC
compressors, where approx. 80% have standard components and 20% are customized, achieves the same efficiency l­evels as customized integrally geared compressors. This compressor series covers volume flows from
120,000–400,000 m3/h with five casing sizes.
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STC-GC (165–400)
Volume flow: 120,000–400,000m3/h
Technical Data
STC-GC
Volume flow rates from 10,000 to 120,000 m³/h
(5,900 to 70,600 cfm)
Benefits
Compact design
Standardized, pre-engineered for economy
and reliability
Suction pressure up to 1.1 bar (16 psi)
Siemens-owned gear technology
Pressure ratio up to 20 (machine size 10–50)
Highest technical quality standards
Pressure ratio up to 7.5 (machine size 63–100)
Optimized performance
Electric motor drive (fix speed)
Short lead times
Air and nitrogen
Reduced investment costs
Short on-site installation
Technical Data
STC-GC (H)
Volume flow rates from 3,600 to 11,000 m³/h
(2,100 to 6,500 cfm)
Suction pressure up to 5 bar (72.5 psi)
Pressure ratio up to 8
Electric motor drive (fix speed)
Technical Data
Volume flow rates from 120,000 m³/h up to
400,000 m³/h (70,600 to 235,400 cfm)
Suction pressure up to 1.013 bar (16 psi)
Pressure ratio up to 6.5
Electric motor drive
(fix speed, synchronous/asynchronous)
Max. coupling power between 12 and 30 MW
Air
Benefits
Highest efficiency through use of well proven
flow components
Efficiency as high as with customized compressor
series STC-GV
Maximum cost savings through standardization
Short delivery time
High number of fixed options ensures highest
­flexibility to meet individual project requirements
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Smart design for optimum performance
Design and quality of the pre-engineered STC-GC turbocompressor are in accordance with the world-wide
accepted Siemens’ standards. All auxiliaries are according
to ASME and PED guidelines.
Pre-designing of compressor components is approximately
80%, whilst the remaining 20% is covered by project
specific parts. This approach means lean processes,
minimizes lead time and reduced costs of the compression
system with at the time highest efficiency levels, guarantees the use of well proven components, enhancing plant
reliability and availability.
The STC-GC features a compression ratio of 6.5 in only
three stages, with IGV on the first stage inlet for flow control. The well proven 3D impellers derived from the customized integrally geared compressor series STC-GV.
By smartly combining the heat exchangers (interstage
and after cooler) their number was reduced significantly,
only seven heat exchangers serve to cover the whole line.
Standardization principle at a glance
Five frame sizes
Fixed bull gear / pinion shaft concept
Multiple use of equal process gas coolers within up to
three frame sizes, in total only seven process gas cooler
designs for five frame sizes
Concrete foundation, only cast volute casings
Vaned diffusers for high stage efficiencies
Inlet guide vane unit in front of first stage for stepless
compressor control
Gear design acc. DIN 3990 and AGMA 6011 leads to
Service Factor of at least 1.7
Highlights
Only seven heat exchangers for whole compressor
line thanks to smart design.
Optimized control and safeguard system, SCAUT
CPD, guards against faulty operation conditions.
Can be operated via customer’s DCS.
Inlet guide vane unit in front of first stage for
stepless compressor control.
50 Hz and 60 Hz versions.
Well proven Hirth connection between impeller and
pinion shaft
State-of-the-art 3D semi-open 65° and 50° impeller,
deriving from customized series STC-GV
Pre-designed components (i.e. volutes, gas coolers,
oil unit, etc.)
Fixed connection coordinates to battery limits
– early air separation unit arrangement planning possible
– simple assembly concept
Compressor train comprising standardized
integrally geared turbocompressor and electric
motor drive
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Smart Protection
Compact protection device for standardized integrally
geared turbocompressors (STC-GC 165-400)
To ensure optimum operation and protection of the
standardized STC-GC, Siemens has adapted and incorporated the existing compressor automation concept SCAUT.
SCAUT CPD (Siemens Compressor AUTomation Compact
Protection Device) is a most suitable and cost saving
safety device for operation of Siemens pre-designed
STC-GC compressor series which allows optionally the
control of the compressor process.
SCAUT CPD is a module derived from the well proven
SCAUT product series based on Simatic S7 hardware.
It enables customers to control the entire compression
train and ensures a reliable and save operation through
a standardized solution with a modular structure.
Highlights
Protection of compressor against improper operation
conditions
Benefits
Highly efficient protection of compressor against
incorrect operation
Monitoring possible in customer DCS, additional
anti-surge safety device not necessary
Suitable for any DCS configuration
Reliable IGV control for wide operation range
with highest efficiency also for part- and peak
load to minimize the operational costs
Process control function optionally included
without additional dedicated controller leads to
reduced overall CAPEX
Safeguard and control of anti-surge limit, max. power,
max. discharge pressure and minimal IGV position
Compressor operation via customer Distributed Control
System (DCS)
Optional the process control can be done directly
via SCAUT CPD
SCAUT CPD supports single stage control in case
of grid frequency fluctuation
Cost saving integration in local junction box with
­operator display
Operator’s view on CPD panel
Standardized integrally geared main air compressor
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Published by and copyright © 2013:
Siemens AG
Energy Sector
Freyeslebenstrasse 1
91058 Erlangen, Germany
Siemens AG
Energy Sector Oil & Gas Division
Wolfgang-Reuter-Platz
47053 Duisburg, Germany
Siemens Energy Inc.
10730 Telge Road
Houston, Texas 77095, USA
For more information, please 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
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Printed in Germany
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K12 130022, P WS 05131.
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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.