Answers for energy.
Canned, clean and smart
STC-ECO hermetically sealed integrated motor compressor unit
for dirty-gas applications onshore, offshore, and subsea
Answers for energy.
Canned, clean and smart
STC-ECO hermetically sealed integrated motor compressor unit
for dirty-gas applications onshore, offshore, and subsea
The challenges of upstream dirty-gas compression together with other
demanding applications which have traditionally suffered from poor
seal reliability call for a radically different approach to the design of
compression solutions.
Introducing the STC-ECO. Based on Siemens field-proven hermetically
sealed technology, the STC-ECO is a compact, fully integrated, sealless
motor-compressor unit of low complexity. It has been specifically
designed to meet the requirements of the most demanding applications
in the upstream business. These applications have either suffered from
poor seal reliability — notably upstream of the glycol dehydrator — or
involve hazardous and toxic gases, containing H2S, mercury, CO, etc.
After two years of field operation, the prototype of the STC-ECO has
proven the credibility of its concept and design, which offers significant
benefits for owners, operators and the environment.
Increased plant safety
The STC-ECO features a fully integrated, canned design. Compared to
solutions consisting of discrete components, this represents a substantial reduction of interfaces and, hence, providing a major improvement
in plant safety.
Increased uptime
The STC-ECO has been designed for ultimate ruggedness while at the
same time reducing complexity. With 5+ years maintenance intervals, it
offers superior availability and unparalleled lifetime value.
Zero emissions
The STC-ECO have been developed with special attention to applications
involving hazardous and toxic gases. Its sealless, canned design means
zero emissions for ultimate HSE compliance.
STC-ECO — A fully proven solution
Representing a quantum leap in compressor technology, the STC-ECO
has been co-developed by Shell and Siemens, two companies enjoying
a long-standing mutually cooperative relationship. Key to the success
of the project, the Shell research team has been part of the joint development group. To date, the STC-ECO is the only API-conforming sealless compression solution available for dirty-gas applications without
need for clean-gas supply.
Preceded by months of extensive inhouse testing, in autumn 2006 the
STC-ECO prototype was deployed at NAM’s Vries-4 gas gathering site
near Groningen, Netherlands. For more than 20 months, it has operated
with dirty process gas in modulating mode and under routine asset
control. During this time, it was subjected to a wide range of contaminants, including sand, and water.
A scheduled inspection after its first year of general use-and-abuse
operation in saturated gas confirmed that the STC-ECO prototype was
in excellent condition. Not only did the test prove the suitability of the
design for the intended applications, but additional tests also supported
the confidence in achieving the desired 5-years maintenance interval,
which had been among the key performance criteria in the development of the STC-ECO.
Following the completion of field testing, the STC-ECO prototype continued to operate as a standard machine, achieving some 10,000
operating hours by August 2008, effectively transforming the unit from
prototype-under-test to an extension of normal production facilities.
Compact footprint
The STC-ECO comes with a built-in variable-speed drive, offering maximum flexibility of operation. At the same time, the vertical, integrated
concept enables a drastic reduction in the overall footprint, requiring
minimal space in the plant layout.
The STC-ECO with its top being removed for inspection.
Technical specifications
STC-ECO, the Siemens sealless technology platform, has been designed
for dirty-gas application in the upstream, midstream and downstream
sectors. Focus applications will include field depletion, gas-and-oil separation, gas gathering, gas lift and many others. Its unique design
features offer a range of unparalleled benefits:
• Increases uptime due to absence of seals, and minimal number of
sub systems
• Environmentally friendly due to zero emissions
•
Allows for a smaller compressor building due to a footprint reduction
of > 40 percent compared to a conventional VSD-driven compressor
with intermediate gear
• Easy to install as a single integrated solution
• Less maintenance due to reduced number of auxiliary systems
• Wide operating range through variable-speed drive
The STC-ECO fully complies with API617 specifications and can also
be supplied to NACE standards. It will be available with four different
power ratings:
LP1* LP2 HP1 HP2
Power (MW) 7,5 10 15 20
Rated speed (rpm) 12.200 9.500 9.500 7.600
Speed range (typical) 30 – 105%
No. impellers up to 6 up to 6 up to 8 up to 8
Configuration inline and back-to back
Casing design 1500# 1500# 2500# 2500#
Dimensions (m) 4.8 x 4.1 x 4.6 to follow soon
Footprint reduction (%)** > 40 > 40 to follow soon
* installed and operational
** compared to standard compressor package including converter and cooler bank
(2 x 100%)
STC-ECO product range
otor Rating (MWatt)
25
20
15
10
5
STC-ECO (HP2)
STC-ECO (HP1)
STC-ECO (LP2)
STC-ECO (LP1)
Longitudinal cut through the STC-ECO, showing motor/compressor section at the
center, and active magnetic bearings at the top and bottom end.
0
Speed (r. p. m)
40002000 6000 8000 10000 12000 14000 16000
The STC-ECO will be delivered as a skid-mounted unit measuring a mere 4.8 x 4.1 x
4.6 meters.
Published by and copyright © 2008:
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 contact
E-mail: oil-gas@siemens.com
Oil & Gas Division
Order No.: E50001-G440-A103-X-4A00
Printed in Germany
Dispo 05400 c4bs No 4429, 4502 WS 10083
Printed on elementary chlorine-free
bleached paper.
All rights reserved.
Trademarks mentioned in this document
are the property of Siemens AG, its affi liates,
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 specifi ed in the contract.
www.siemens.com/oil-gas
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