Centrifugal compressors with horizontally split casing typically permit internal pressures of 70 bar and volume flow rates of up to 3,00,000 m3/hr at low pressures. Drive ratings of 30 MW for single casing machines have already been implemented.
Figure 3 shows a cross section of a six-stage horizontally split centrifugal compressor. Standardized components ensure high availability and easy fitting. The two halves of casing are sealed and bolted together.
The rigid structure is supported at the center line, thus preventing vertical shifting of the compressor shaft as result of thermal expansion. For erection and dismantling purposes, the top half of the casing, complete with the associated stationary components, can be handled as a single unit. All types of drives can be employed, for example, gas turbines, steam turbines, and electric motors. Many processes require compression of a fluid in one process stage only, i.e. continuous compression from the first to the final stage with constant mass flow rate.
Most major centrifugal compressor manufacturers build machines for the field of application with up to nine or as many as twelve compression stages. Aerodynamic matching of the individual compression stages is by means of diaphragms with diffuser channels and vaned return passages. Following the final stage, the compressed gas enters a collecting chamber in the form of a volute before it reaches the discharge nozzle. The shaft is supported in bearings out side the compression space. Shaft sealing is means of tried and proven systems such as labyrinth ring, mechanical contact or non-contact seals.
The wide range of possible variations in the materials used and in the selection of the sealing system render compressors of this series suitable for virtually all fields of application in industry, chemical and petrochemical and processes, and for almost all gases and mixtures of gases.
See Also:
OVERHUNG CENTRIFUGAL COMPRESSORS
OVERHUNG CENTRIFUGAL COMPRESSORS DIAGRAM
Mixed Flow Compressors
Horizontal Split Centrifugal Compressor Diagram
Horizontal Split Centrifugal Compressor detail and operation
Centrifugal Compressors:
Reciprocating compressors :
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