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STC-GV, STC-GVT Siemens Turbocompressor –
Integrally Geared, Vertically split volute casing
A success story since 1948
Since its inception 60 years ago, the
STC-GV compressor series has been meeting demands for compression solutions
with high efficiencies and pressures up to
200 bar. STC-GV compressors, designed
according to customer specifications and
in accordance with both API 617 and
API 672, guarantee the highest quality
and technical standards for a broad range
of industrial application.
An innovative and compact design allows
for an integrated turbine drive within
STC-GV, where compressor stages and
turbine are mounted on the same gear
(STC-GVT).
Highlights
The perfect match for all air
separation and process industry
requirements
High efficiency and out-
standing operating range
Powerful and robust
design, with integrated
turbine or expander options
Flexible design concepts combining
custom-tailored design with
standardized components for
maximum reliability
Siemens is the only compressor
manufacturer who also develops
and supplies proprietary gear
technology
Fields of application
Air separation
Ammonia
Carbon capture and storage
Ethylene oxide
Flare mitigation
Fuel gas
Hydrocarbons
Metallurgy
- Direct reduction
- Direct smelting
Petrochemicals
Phenol
Refineries
Synthetic fibers
Siemens Turbocompressors
Answers for energy.
Integrally geared centrifugal
compressor with vertically
split volute casing (STC-GV)
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Design Concept
Powerful, robust and reliable
The STC-GV integrally geared centrifugal
compressors feature a multi-shaft arrangement with different speeds. All shafts are
mounted in maintenance-free, oil-lubricated hydrodynamic bearings. With up to
eight compressor stages around a central
bull gear, the STC-GV compressor series
forms a compact unit for the multi-stage
compression of a wide range of gases.
Optimized shaft speeds, modern impellers,
tailored aerodynamics and mechanics
along with optimized auxiliaries guarantee the highest efficiency. Adjustable
guide vane units at the first and /or any
other compression stage optimize the
operating range. External cooler arrangements allow for operation at extreme
site conditions.
Package and driver options
For most STC-GV compressor sizes,
Siemens offers a package design. The
package includes the compressor, driver,
process gas coolers, lube oil console,
process piping and all tubing and wiring.
The package design leads to significantly
reduced on-site installation time. These
compressor types are also suitable for
direct turbine-drive or integrated turbine
design (STC-GVT).
Driver: depending on process and energy
resources: steam turbine, gas turbine or
electric motor.
Siemens also offers variants of
the STC-GV:
STC-GV (H): this compressor is designed
for high-pressure application with
suction pressures higher than 5 bar,
especially booster air in air separation.
STC-GVT: a new and compact design,
STC-GV is also available with integrated
turbine drive, compressor stages and
turbine being mounted on the same
gear.
STC-GT: single- or multi-stage
expanders enable power recovery
from process gases.
STC-GVT: with its single or multiple
expander stages, STC-GV T is the ideal
solution for simultaneous gas compression and expansion of process gas.
integrated steam turbine (STC-GVT)
STC-GVT on testbedIntegrally geared turbocompressor with
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Main air compressor for a steel plant Rotor assembly of an integrally
geared turbocompressor
Highlights
Integrally geared, multi-stage design
Wide operating range and outstanding
part-load efficiency at turndown
Multi-service capability due to
finely-graded standard components
Feeds multiple functions from
one casing
Can be used in toxic, corrosive and
hydrocarbon application
Up to eight stages
Casing (volutes) fabricated or cast-
material: from cast iron to stainless steel
Axial inlet to each impeller, intercooling
between stages
High-efficiency water separators
Flexible cooler design
Design codes for any kind of gas
Design codes API 617 and API 672
GVT with expansion stage (s)
Inlet guide vane unit in front
of each stage
Optional interheating between stages
Control systems
Perfect protection and process control via
flexible Siemens compressor automation
(SCAUT) control systems:
Anti-surge protection
Performance controllers acting on
mass flow, suction pressure or
discharge pressure
Simultaneous control of sets of variable
inlet guide vanes
Controlled by throttling, bypass opera-
tion or inlet whirl variation
Operation with all available drive
systems, i. e. electric motors, steam
turbines and gas turbines
Fully automatic or semi-automatic
start-up and shutdown sequences
exactly matched to customers’
process demands
Certified safety systems available
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Air separation
Actual suction flow rate
Suction pressure/Discharge pressure
100
50
60
10
5
1
3
0050010501 V.1,000 cfm
50 100
V.1,000 m
3
/h
1051 1000500
51
p.psi
1000
500
200
100
50
25
Stage
7 to 8
Stage
5 to 6
Stage
3 to 4
2 Stages
bar
range
suction pressure range
discharge pressure
suction pressure range
discharge pressure range
10
32 4610 16 20 32 40 50
16 20 32 40 50 80 100 125
160 200
Siemens integrally geared turbocompressors STC-GV are the perfect
match for air separation and air compression. In these processes,
the integrally geared turbocompressor serves as main or booster air
compressor, combined main and booster air compressor and oxygen
compressor. While as main air compressor (MAC), discharge pressures
between 5 and 30 bar are key, the booster air compressor (BAC)
STC-GV (H) realizes up to 100 bar, depending on process specifications.
compression
CO
2
The compressors in the STC-GV series are ideal for CO
compression
2
where high-pressure capacities of about 200 bar are essential, paired
with the highest efficiencies and most reliable technologies. Based on
standardized machine concepts, Siemens has developed a tailor-made,
optimized solution for carbon capture and storage. The integrally
geared compressor series STC-GV covers a suction volume of CO
3
ween 25,000 and 250,000 m
/h. With multistage design and possible
bet-
2
intercooling after each stage, the STC-GV realizes up to 200 bar in one
machine. Up to eight stages enable four different rotational speeds,
leading to optimized aerodynamic efficiencies.
Technical data
Volume flow rates up to 480,000 m3/h
(280,000 cfm)
Discharge pressure up to 100 bar
(1,450 psi) air and other gases
Discharge pressure up to 200 bar
(2,900 psi) CO
2
Gearbox ratings up to 60,000 kW
(80,000 hp)
Application range STC-GV for air and other gases
Benefits
Proven design concept, patented in 1948
High efficiency and wide operating range
Multi-service capability and various application options in one casing
Long life due to process-optimized materials
Cost-efficient, compact compression solution
Siemens-owned gear technology
Flexible cooler design
High-efficiency water separators
atmospheric conditions
high pressure application
special design for fuel gas,
direct reduction and phenol
Published by and copyright © 2009:
Siemens AG
Energy Sector
Freyeslebenstrasse 1
91058 Erlangen, Germany
Siemens AG
Energy Sector
Oil & Gas Division
Wolfgang-Reuter-Platz
47053 Duisburg, Germany
www.siemens.com/energy
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
Oil & Gas Division
Order No. E50001-G420-A114 -X-4A00
Printed in Germany
Dispo 34806, c4bs 7489 P WS 06095.
Printed on elementar y chlorine-free
bleached paper.
All rights reserved.
Trademarks mentioned in this document
are the proper ty 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.
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