Siemens STC-GVT Compressor Series

Since its inception 60 years ago, the Siemens STC-GV compressor series has been meeting demands for compression solutions with high efficiencies. Comprising either single or multi-stage expanders or an integrated turbine drive, the Siemens STC-GVT series builds on reliable compressor technologies. Designed in accordance with customer specifications and with both API 617 and API 672, Siemens STC-GVT guarantee the highest quality and technical standards for a broad range of industrial applications.

Highlights

• The perfect match for air separation and process-industry requirements
• High efficiency and outstanding operating range
• Powerful and robust design, with integrated turbine or expander options
• Flexible design concepts combining custom-tailored design with standardized components for maximum reliability
• Siemens is the only compressor manufacturer who also develops and supplies proprietary gear technology.

Applications

• Air separation
• Direct reduction
• Nitric Acid
• Phenol
• Synthetic fibers

Design Concept

The Siemens STC-GVT integrally geared centrifugal compressors with single or multi-stage expanders feature a multi-shaft arrangement with different speeds. All shafts are mounted in maintenance-free, oil-lubricated hydrodynamic bearings. Optimized shaft speeds, modern impellers, tailored aerodynamics and mechanics along with optimized auxiliaries guarantee the highest efficiency. Adjustable guide vane units at the first and / or any other compression stage optimize the operating range. External cooler arrangements allow for operation at extreme site conditions.

Package

Package and driver options

For most STC-GV compressor sizes, Siemens offers a package design. The package includes the compressor, driver, process gas coolers, lube oil console, process piping and all tubing and wiring. The package design leads to significantly reduced on-site installation time. These compressor types are also suitable for direct turbine-drive or integrated turbine design (Siemens STC-GVT).

Highlights

• Integrally geared, multi-stage design
• Up to three expansion stages
• Wide operating range and outstanding part-load efficiency at turndown
• Multi-service capability due to finely-graded standard components
• Feeds multiple functions from one casing
• Can be used in toxic, corrosive and hydrocarbon applications
• Casing (volutes) fabricated or cast – material: from cast iron to stainless steel
• Axial inlet to each impeller, intercooling between stages
• High-efficiency water separators
• Flexible cooler design
• Design code API 617 + API 672

GVT with expansion stage(s)

• Inlet guide vane unit in front of each stage
• Optional interheating between stages

Control Systems
Perfect protection and process control via flexible Siemens compressor automation (SCAUT) control systems:

• Anti-surge protection
• Performance controllers acting on mass flow, suction pressure or discharge pressure
• Simultaneous control of sets of variable inlet guide vanes
• Controlled by throttling, bypass operation or inlet whirl variation
• Operation with all available drive systems, i. e. electric motors, steam turbines and gas turbines
• Fully automatic or semi-automatic start-up and shutdown sequences exactly matched to customers’ process demands
• Certified safety systems available

Technical Data

• Volume flow rates up to 480,000 m³/h (280,000 cfm)
• Discharge pressure up to 60 bar (870 psi) air and other gases

Driver: depending on process and energy resources: steam turbine, gas turbine or electric motor, integrated steam turbine (package design).

Benefits

• High efficiency and wide operating range
• Multi-service capability and various application options in one casing
• Long life due to process-optimized materials
• Cost-efficient, compact compression solution
• Siemens-owned gear technology
• Flexible cooler design
• High-efficiency water separators