Siemens STC-ECO Technical data
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.
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