From its invention in 1948, Siemens has perfected the design and manufacture of integrally geared compressors. Today, more than 2,200 units have been installed globally proving their worth with a wide reference base in a wide range of industries and process applications.
Integrally geared compressors are multi-shaft machines. Several pinion shafts with two impellers each are arranged around a central bull gear. For each pinion shaft a perfect combination of shaft speed and impeller size can be realized. All impellers are of overhung design and can be fitted with adjustable inlet guide vanes in front of each impeller. Inter-stage cooling of the gas stream can be done after each impeller discharge. The combination of these features allows for high volume flows, outstanding energy efficiency even under part load, all in a compact design.
For small- to medium-size 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. For large-size units all main train components are delivered separately on site and installation is on a concrete foundation.
A variant of the customized integrally geared compressor allows the integration of a single- or two-stage radial expansion turbine as a direct drive option for the compressor. This allows the direct recovery and conversion of energy from pressurized high temperature process gas streams into kinetic energy driving the compressor. Depending on the amount of available energy this drive option can serve as a sole, main or auxiliary driver in combination with e.g. an electric motor or motor generator.
The first group is available in nine frames (sizes 10-100) and offers a wide range of options and can be packaged as compact single-lift units. The product line is the compact and standardized version of the customized integrally geared compressor series, the trusty workhorse of the air separation and process industries. Its high degree of standardization results in lower capital cost and shorter delivery times as compared with fully customized compressors.
The second group extends the available range of volume flow rates to between 120,000–400,000m3/h capacities with additional five frame sizes (165-400). Eighty percent of the machine is pre-engineered for consistency and repeatability. 20 percent of the machine can be customized for specific customer process needs.
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