Centrifugal compressor12/13/2023 Multistage compressors consists of several impellers arranged one after another on rotor such that the discharge from the 1 st impeller diffuser will enter a return passage way which guides it into the eye of the next impeller. When a single stage compressor with one impeller cannot meet the pressure requirements a multi stage centrifugal compressor is used. Integrally geared single stage compressors are used to serve demanding duties in clean process gas or air service. Fig-3: Integrally geared single stage compressor It can handle Gas flows up to 300,000 m³/hr, pressure ratio up to 3.5 and discharge pressure up to 50 bar can be achieved. Impeller is overhung mounted directly onto the high-speed shaft of gearbox. Integrally geared single stage turbo compressors have overhung semi open impellers. Integrally geared single stage compressors Fig-2: Between bearing type centrifugal compressorīetween bearing design single stage compressors are mainly used as a booster or recycle compressor In petrochemical industries such as Ethylene oxide/Ethylene Glycol plant, propylene plant, polyethylene plant, chlorine, sulphuric acid plant, MVR (mechanical vapour recompressor) plant. It can handle Gas flows up to 40,000 m³/hr, pressure ratio up to 1.45 and discharge pressure up to 2 bar can be achieved. In the between bearing configuration, the impeller is mounted between the bearings. Between bearing design single stage compressors Overhang single stage compressors are used mainly on coke gas service. It can handle Gas flows up to 60,000 m³/hr and pressure ratio up to 3.5 can be achieved. Removal of impeller is not needed to do the maintenance of bearing it can be done simply by opening the bearing casing. The compressor flow is controlled by inlet guide vane, suction/discharge throttle valve or by passing. These are mainly designed for low pressure, high volume application. These type of compressors have axial flow suction nozzle, which give higher efficiency and a wide operating range. In the overhung configuration, the impeller is located at the non-drive end of the shaft (outboard of the non-drive end radial bearing). Various types are as following Overhang single stage compressors Single-stage centrifugal compressors may be configured as a beam design or with an overhung impeller arrangement. Initial cost for medium to high capacity range of single stage compressors is attractive than other types. The Flow capacities of these types range from 1000 cfm to 300,000 cfm. Generally a single stage compressor can achieve up to a 3 to 1 compression ratio. The compression ratio capability of the compressor is primarily a function of the impeller peripheral speed and blade geometry. 2.5 Integrally geared multistage compressors- Single Stage compressor–Ī single stage centrifugal compressor consists of a single impeller with associated guide vanes and diffuser.
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