STC SH Horizontally Split Centrifugal Compressors

Industrial Applications
STC-SH
Siemens single-shaft centrifugal
compressors with horizontally split casing
Robust and dependable
Single-shaft centrifugal compressors with horizontally
split casings in the STC-SH series can be used
for the majority of process applications. They are
designed according to API 617 specifications.
Casings are mostly fabricated, but can also be
cast for special applications (e.g. low temperature).
The horizontally split casing split permits easy access
to all compressor internals by simply removing the
upper half of the casing.
Flexible adaptation
The design concept of STC-SH compressors is very
flexible, allowing easy adaptation to the requirements
of specific process applications.
These centrifugal compressors can be equipped
with up to ten impellers, divided into up to four
process stages per casing. This enables multiple
intercooling and side streams. Designs include
straight through, double-flow and back-to-back
configurations.
A well-proven, fully-parametric aerodynamic
design, based on comprehensive in-house research
& development, allows for the perfect matching
of compressor performance and rotor dynamics
for any application.
State-of-the-art sealing
With a wide variety of sealing systems (labyrinth
seals, carbon ring seals, brush seals and mechanical
dry gas seals), this robust compressor design
is suited for a wide range of process gases.
Mechanical dry gas seals, in combination with
active magnetic bearings for compressor and driver,
yield the special economic and environmental
benefits of dry-dry (oil-free) equipment operation.
Perfect process control
STC-SH compressors can be controlled by either
throttling, bypass operation or speed variation,
and can therefore be operated with all available
drive systems (i.e. electric motors, steam and gas
turbines, as well as expanders). Adjustable inlet
guide vanes in front of the first impeller offer special
advantages regarding turn-down and part-load
efficiencies as required in certain applications.
Single-shaft centrifugal compressor
with horizontally split casing
Power Generation

Technical performance data
Volume flows from 500 to 480,000 m 3 /h (300 to 280,000 cfm)
Discharge pressure for oxygen and inert gas up to 100 bar (1,450 psi)
Discharge pressure for other process gases up to 50 bar (725 psi)
Fields of application
Discharge pressure
On-/offshore Oil & Gas
Petrochemicals
Fertilizers
Olefins
100
50
p . bar
10
5
1
0,4
Refineries
General chemicals
and others
Application range STC-SH
Frame sizes 05 06 08 10 12 14 17 20 23
Speed range
1
V . 1,000 m3 /h 10
50
Actual suction flow rate
1000
500
p . psi
100
50
10
100 500
0,5 1 V 50 100 280
. 1,000 cfm 10
Speed
min -1
21,000
15,000
9,000
3,000
0
Boil-off turbocompressor
in an LNG plant
Eight-stage coker gas turbocompressor
for a refinery
Published by and copyright © 2005:
All rights reserved.
Siemens AG
Power Generation
Industrial Applications
Wolfgang-Reuter-Platz
47053 Duisburg, Germany
e-mail: welcome.pgi@siemens.com
www.pg.siemens.com
Siemens Industrial
Turbomachinery, Inc.
10730 Telge Road
Houston, Texas 77095, USA
Order No. A96001-S90-A149-V1-4A00
Printed in Germany
1388 177140M DA 06052.
Subject to change without prior notice
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 do not always have to be
present in individual cases. The required
features should therefore be specified in
each individual case at the time of closing
the contract.