Design ConceptSTC-SH  Flexible adaptation
The design concept of STC-SH compressors is very flexible, allowing easy adaptation to the requirements of specific process applications (e .g. gas or water injection).
Casings are mostly fabricated, but can also be cast for special applications (e. g. low-temperature applications down to -163 °C / - 261 F°). Impellers and stator parts (e. g. return vanes) are tailor-made and 100% machined, thus ensuring high aerodynamic predictability. The horizontally split casing permits easy access to all compressor internals by simply removing the upper half of the casing.
These centrifugal compressors can be equipped with up to ten impellers per casing and each casing can contain as much as four process stages. Designs include straight-through, double-flow and back-to-back configurations. A well-proven, fully parametric aerodynamic design, based on comprehensive in-house research and development, allows for the perfect matching of compressor performance and rotor dynamics for any application. Compressors of the STC-SH series are project-specifically designed to meet individual customer needs.
Besides conventional oil-lubricated tilting pad bearings, active magnetic bearings can be used, allowing 100% oil-free operation of compression trains in combination with electric motors, which are available also with magnetic bearings.
Highlights
- The first impeller of each process stage can be equipped with adjustable inlet guide vanes (IGV) allowing additional throughput and optimum turndown with maintained high efficiency
- Dry gas seals, whether single, double or tandem, are used as standard as shaft end seals
- Up to four process stages per casing
- Up to ten impellers per casing
- Intercooling and sidestreams
- Easy access to internals
- Active magnetic bearings as a referenced option
Control Systems
Perfect protection and process control via flexible Siemens control systems:
- Anti-surge protection
- Performance controllers acting on mass flow, suction or discharge pressure
- Controlled by either IGV control, suction or discharge throttling, bypass operation or speed variation, thus operation with all available drive systems, i. e. electric motors, steam and gas turbines
- Fully or semi-automatic start-up and shutdown sequences exactly matched to your process demands
- Certified safety systems available
- Local and remote control
- Load-sharing controller for parallel trains
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