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Turbocompressors from Siemens –
a unique portfolio for all industries
Siemens offers a full range of turbocompressors to meet Catering for mega-scale applications
the needs of the oil and gas and process industries: As a technology of the future, CTL is worth a mention in
centrifugal, axial or axial-radial, and integrally geared its own right. This complex process demands a consider-
compressors can be matched with all kinds of mechan- able variety of very large rotating machinery.
ical drives – steam turbine, gas turbine, VSDS system
Siemens offers compression and power generation pack-
or electric motor – in a solution to match each unique
ages for air separation, the syngas processes and the refin-
customer.
ery processes with its own steam turbine, gas turbine or
electric motor drive.
A wide range of products and a wealth of experience
With our unrivalled competence in complete compressor Siemens has successfully supplied the largest air compres-
train solutions from a single source, the Siemens portfolio sors and the largest mechanical drive steam turbines ever
offer an extensive range of standardized and tailor-made made. This experience makes Siemens the partner of
compression solutions (Siemens Turbo Compressors – choice for all compression and power requirements in all
STCTM). The portfolio comprises both standardized and tai- sections of the CTL process up to a complete power island.
lor-made compression solutions. Our standard units with
One of the recent innovations is the STC-ECO motor-com-
predefined engineering options ensure low investment
pressor which is 100% emission free. Unlike a conventional
costs and short delivery times. For the more complex pro-
compressor, it is hermetically sealed and canned. Canned
cesses such Gas- or Coal-to-Liquids (G / CTL), production of
means that contaminated gasses can not come in contact
purified terephthalic acid (PTA), Liquefaction of natural
with the electrical components. As a result, the service
gas (LNG), sour gas or integrated gasification combined
requirements of this product are lower and the operator
cycle plants (IGCC), we provide uniquely tailored
benefits from long maintenance intervals.
solutions.
Oil & gas applications have either suffered from poor seal
Coal Bed Methane and Shale gas, air separation, petro-
reliability – notably upstream of the glycol dehydrator – or
chemical plants and refineries, catalyst regeneration and
involve hazardous and toxic gases, containing H2S, mer-
synthetic fiber production are amongst the most common
cury, CO2, etc. The STC-ECO has been specially designed to
applications for our compression solutions.
meet the most demanding upstream requirements!

With our comprehensive

experience and portfolio on
compressors and drives we can
recommend the best possible
configuration to perfectly suit
your project requirements.

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STC-GC STC-GC (pre-engineered)
The compact solution for air separation Highest efficiencies and highly pre-engineered
The STC-GC is an integrally geared compact turbocompressor avail- The existing STC-GC compressor range has been extended by the
able in 9 frame sizes and with a wide range of options packaged as a introduction of a new pre-engineered series covering the 120,000-
compact single-lift unit. The STC-GC product line is the compact and 400,000m3/h capacities with five casing sizes. 80% of the machine
standardized version of the customized integrally geared compressor is pre-engineered for consistency and repeatability: 20% of the
series STC-GV, the trusty workhorse of the air separation and process machine can be customized for specific customer process needs.
industries.
This design means lean processes, minimizes lead time and reduced
This range of compact integrally geared compressors is also available costs of the compression system with at the time highest efficiency
as high pressure version STC-GC (H). levels, guarantees the use of well proven components, enhancing
plant reliability and availability.

Compact integrally geared centrifugal turbocompressor Pre-engineered compact integrally geared turbocompressor

Technical data Technical data


Flow rates from 3,600 to 120,000 m³/h Flow rates from 120,000 to 400,000 m³/h
(2,120 to 70,680 cfm) (70,680 to 235,600 cfm)
Pressure ratio up to 20 Pressure ratio up to 6.5
Electric motor drive (fixed speed) Electric motor drive (fixed speed, synchronous / asynchronous)

Fields of application Fields of application

Air separation Air separation (main air compressor)

Compression of process air Features
Compression of nitrogen
Highest efficiency through use of well proven flow components
Features Efficiency as high as with customized compressor series STC-GV
Compact, single-lift unit Highest flexibility deriving from large number of fixed options

Maximum performance due to pre-designed gears, highest effi-
ciency impellers, tailored aerodynamics and pre-defined auxiliaries
Up to four compressor stages

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STC-GV / STC-GVT STC-GT
The robust multitalent Proven concept for direct power recovery
The STC-GV integrally geared centrifugal compressors feature a multi- The STC-GT is an integrally geared process gas radial turbine enhancing
shaft arrangement with different speeds and up to eight compressor power supply in processes with off-gas or process gas as byproducts.
stages around a central bull gear, forming a compact unit for the Medium or high-temperature gas can be used directly to drive a com-
multi-stage compression of a wide range of gases. These trains are pressor or electric generator without additional heat exchange or
typically supplied as complete packages, including all rotating equip- steam generation equipment. STC-GT’s design is in accordance with
ment, intercoolers and oil console.The STC-GVT is an integrally both API 617 and API 672.
geared multi-stage compressor comprising expander stages,
For economic part-load operation, the STC-GT can be fitted with an
designed in accordance with both API 617 and API 672.
adjustable nozzle vane unit. This unit is normally located in front of the
first stage, offering very good turn-down and part-load efficiencies.

Integrally geared centrifugal turbocompressor Integrally geared process gas radial turbine

Technical data Technical data


Flow rates from 800 to 580,000 m³/h Discharge volume from 3,000 to 600,000 m³/h
(471 to 341,620 cfm) (1,766 to 353,160 cfm)

Discharge pressure up to 200 bar (2,901 psi) Expansion ratio 4
Driver of your choice Power recovery up to 45,000 kW

Fields of application Gas inlet temperature up to 550 °C ( 1,022 °F)


Air separation Ammonia Fields of application

Carbon capture and storage Synthetic fibers Synthetic fibers, especially

Ethylene oxide Petrochemicals – Pure Terephthalic Acid (PTA)
–D  imethyl Terephthalate (DMT)
Refineries Metal making
Nitric acid
Features STC-GV
Features

High efficiency due to tailored aerodynamics

Adjustable inlet guide vane ­for economic part-load operation

Wide operating range due to adjustable guide vane units

Uses many of the proven components from the i­ntegrally

Multi-service capability due to finely-graded standard components
geared centrifugal compressor concept

Package design significantly reduces on-site installation time
Radial inlet to each stage
Features STC-GVT Long life due to process-optimized materials

Inlet guide vane unit in front of each stage
Interheating between each stage

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STC-ECO
Hermetically sealed and canned
Based on Siemens field-proven hermetically sealed technology, the
STC-ECO is a compact, fully integrated, and mobile seal-less motor-
compressor of low complexity. It has been specifically designed to
meet the requirements of the most demanding applications in the
upstream business.

Integrated hermetically sealed motor-compressor

Technical data

Flow rates from 250 to 40,000 m³/h (147 to 23,544 cfm)

Design pressure up to 220 bar (3,191 psi)
Electric motor drive (canned, variable speed)

Fields of application

Dirty-gas applications on- Gas gathering

shore, offshore, and subsea Gas lift
Field depletion Gas storage
Gas and oil separation Gas transmission

Features

I ncreases uptime due to absence of seals, and minimal

number of sub systems
Environmentally friendly due to low noise and zero emissions
A
 llows for a smaller compressor building due to a footprint
reduction of > 40 percent compared to a conventional motor
­driven compressor with intermediate gear
E asy to install as a single integrated solution
L ess maintenance due to reduced number of auxiliary systems
O perating range varying from 30 to 105% speed
STC-SH STC-SV
Robust and dependable The allrounder
The STC-SH is a centrifugal compressor with horizontally split casing. The STC-SV is a single-shaft centrifugal compressor with vertically split
All compressor internals are easily accessed by simply lifting the barrel-type casing to cover higher pressures, designed in accordance
upper casing. The customized single-shaft STC-SH compressors are with API 617. All compressor internals are assembled into one bundle
designed according to API 617 and can be used for most process for easy installation and maintenance. The STC-SV allows for perfect
applications and a wide range of gases of any molecular weight, matching of compressor performance and rotor dynamics and is the
including toxic and hazardous applications but limited hydrogene perfect solution to compress gases of any molecular weight.
content.

Single-shaft centrifugal compressor with horizontally split casing Single-shaft centrifugal compressor with vertically split casing

Technical data Technical data


Flow rates from 500 to 480,000 m³/h (294 to 282,528 cfm) 
Flow rates from 250 to 480,000 m³/h (147 to 282,528 cfm)
Discharge pressure for o
­ xygen and inert gas up to 100 bar 
Discharge pressure up to 1,000 bar (14,501 psi)
(1,451 psi) Driver of your choice

Discharge pressure for other process gases up ­to 50 bar (726 psi)
Fields of application
Driver of your choice
On/offshore oil and gas Refineries
Fields of application
Petrochemicals Fertilizers
On/offshore oil and gas Refineries Methanol FPSO
Petrochemicals General chemicals 
Natural gas distribution and storage
Fertilizers Dry chlorine gas
Features
Olefins

Wide variety of sealing systems
Features

Can be operated with any drive system
Flexible design concept, side streams and extractions possible High part-load efficiencies

Wide variety of sealing ­systems 
Suitable for light gases and high pressures

Can be operated with any drive system 
Can be designed for up to four process stages

High part-load efficiencies and with up to 10 impellers

Can be designed for up to four process stages and
with up to 10 impellers

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STC-SX STC-SR
The optimum solution for blast furnace air The perfect match for large air volume flows
The STC-SX series are axial-flow compressors designed to handle Siemens STC-SR axial-radial isothermal turbocompressors are the
large volume air flows and other clean gases within relatively ­ perfect solution to handle large volume air flows whilst maintaining
small casings. excellent efficiencies.
This axial-flow turbocompressor is typically an uncooled straight- The STC-SR series is ideal for applications requiring higher pressure
through compressor, designed for discharge temperatures up to ratios and intercooling. The design incorporates an axial process
350 °C/662 °F. Outstanding blading technology and unique material stage followed by one or more centrifugal process stages. STC-SR
usage result in optimized performance and reliability. compressors combine excellent efficiency with highest quality due
to proven components and compliance with API standards.

Axial flow compressor Axial-radial flow compressor

Technical data Technical data


Flow rates from 50,000 to 1,300,000 m³/h 
Flow rates from 50,000 to 1,300,000 m³/h
(29,430 to 765,700 cfm) (29,430 to 765,700 cfm)

Pressure ratio between 1.9 and 7.0 
Pressure ratio between 5.8 and 16
Driver of your choice Driver of your choice

Fields of application Fields of application

Blast furnace air 

Large-volume air separation plants e.g. for

FCC air (Fluid Catalytic Cracking) – GTL (Gas-to-Liquids)
– CTL (Coal-to-Liquids)
PDH ( Propane Dehydrogenation)
– Methanol
Features
Features
Excellent efficiency

Highest degree of efficiency
Modular design principle
Modular design principle

Extended operation range

Also available with o
­ verhung design

Highest quality standards

Up to 10 axial and 3 r­ adial compression stages
Casings with axial inlets

Up to 19 axial compression stages

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Industrial steam turbines – the ideal drive Electric motors – the individual drive solution
for process industry Where energy has to be purchased – i.e. there is no
Siemens steam turbines (SST™) are the ideal driver for source of natural gas or steam arising from the process –
process industries with exothermic processes where the electric motors are the clean and economical alternative.
heat can be used to generate steam. Steam turbines can The increasing significance of power saving, environmen-
be used in a multitude of ways to generate electrical tal requirements and the desire for a wide variable speed
energy or to drive compressors, blowers and pumps. band have led to the application of electric motors. This
Some fifty percent of the compressors used in cracking has resulted in our individual drive solution for specific
and refining processes are driven by steam turbines. customer requirements in the industry sector.
As a solution provider for the petrochemical industry, An important application for this variable speed electric
Siemens satisfies more customers of high power mechani- drive is for refrigeration compressors in Liquefied Natural
cal drive steam turbines than any other manufacturer. Gas (LNG) plants, the first such “all-electric” drive system
having been successfully built and tested in 2003. Electric
We offer not only the steam turbine, but also the
drive systems of this class are always engineered for the
associated field-proven high-tech products, including
customer’s specific application, allowing the compressor
instrumentation and controls and various auxiliary
to be optimized in capacity and speed for the process on
systems.
hand.
Industrial gas turbines – reliable and flexible pipeline
From our comprehensive portfolio of compressors and
drivers
drives we can recommend the exact configuration that
Siemens gas turbines (SGT™) are the obvious choice of
best suits your project requirements.
driver where natural gas is available to fuel the turbine.
The gas turbine is thus the driver of choice for pumping
and compression for pipe-line gas transportation. It also
has the advantages of being compact and lightweight for
installation on offshore platforms. The gas turbine also
can be used to generate electricity to power an electric
motor, as is frequently the case on Floating Production,
Storage and Off-loading (FPSO) vessels.

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References
Melkøya Island, off Hammerfest, Norway
The world’s first all-electric LNG plant. Designed for flawless operation at arctic
­temperatures and rapidly changing operating conditions.

The world’s largest variable speed drive Harmonic study

­systems (VSDS) rated 65 MW at 3,600 rpm Load commutated inverter (LCI) frequency
for the pre-cooling and sub-cooling converter units, drive control and fault
compressors diagnosis systems
VSDS-driven compressor string Transformers
for the methane mix train
Containerized harmonic filters
32-MW VSDS for the liquefication
Converter cooling systems and auxiliary
compressor
equipment
CO2 re-injection compressor

Groningen Longterm (GLT), The Netherlands

The GLT project includes the renovation and maintenance of 29 production locations
of NAM i­ n the north of the Netherlands. Siemens offered the client higher availability
by applying magnetic bearings for compressor and motors giving them a competitive
advantage.

22x high speed VSD driven compressor Motors for cooling banks; system
trains STC-SV (12-5/8-A) integration; conceptual and detail
The world’s first electrical high-speed engineering
variable-speed drive Network analysis and
Complete rotating string with active vibration studies
magnetic bearings; harmonic filter plant
and all auxiliaries; fan

Leuna 2000
Europe’s largest refinery relies on Siemens technologies.

Twelve e-motor driven air compressors, 110 kV gas-insulated switchgear; power

three oxygen compressors, three hydrogen transformers; mediumvoltage switchgear
rich gas compressors, one compressor train Integrated local control panels for high-
for hydrocarbon mixture voltage switchgear with fieldlevel automa-
Various drive systems tion, incl. substation control and protection
systems and redundant battery system

Sengkang LNG
The four 0.5 MTPA liquefaction trains will provide LNG to meet the growing demand ­
in Southeast Asia, primarily in Indonesia and the Philippines. The power gen sets
will generate electricity for the LNG plant and to the local grid.

4 refrigeration trains for 4×0.5 MTPA Integrated solution of compression, power

VSDS, gear and STC-SV(14-7-B) generation and distribution, automation,
and telecom
Power gen set unit 1 with 60 MW Power
gen set unit 2 with 120 MW and STG Plant engineering for total scope
Integrated power distribution: Reduced overall life cycle cost
150/11 kV outdoor sub-station

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