Centrifugal Compressors SRL
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Centrifugal Compressors SRL - 1

Centrifugal Compressors

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(Single Stage - Directly Driven) (Integrally Geared) Centrifugal Compressor

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SRL Centrifugal Compressors for Air and Process Gas GE Oil & Gas started production of overhung-impeller centrifugal compressors (SRL) in 1966. The first unit with an integral gear was completed in 1979. With their simple, compact structure and excellent reliability, SRL compressors are especially suited to a wide range of heavy duty applications with air, steam and other gases such as those employed in the Petrochemical Industry. The high efficiency, reliability and operational flexibility of the SRL line of compressors is the result of the advanced centrifugal compressor design achieved...

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Advantages of SRL Compressors Simplicity of Installation • Unit prepackaged and tested at factory • No special foundations required Superior Operation • High efficiency and reliability • High compression ratio • Wide range of flow rate • Optimum rotor balance for low vibration level Advanced seal system options available • Absence of lube oil in process gas Ease of Maintenance • Designed for maintainability • Accessibility of components SRL design options • Single or multi-shaft models • Direct or gear (integral or separate) driven Package concept SRL compressors are usually mounted on a...

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SRL Compressor Components Casings Welded casings Welded casings consist of the following parts: - a scroll with the delivery nozzle in a tangential position - an end cover that can be bolted either to a gearbox casing or to a shaft support (the end cover contains the seal area and all the vent / supply channels to the seal are drilled in the cover) - a suction duct to guide the flow through the impeller’s leading edge - a diaphragm that shrouds the impeller - a discharge diffuser (vaneless or vaned). The scroll is generally fixed to the end cover with a simple split locking ring that allows...

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Inlet guide vanes The Inlet Guide Vane (IGV) system allows wide capacity control of the compressor with reduced energy losses. IGVs consist of a row of aerodynamically shaped blades placed at the inlet of the stage. The blades can rotate around their aerodynamic center in order to give the suction flow a pre-swirl that guarantees an optimum incidence angle with the impeller’s leading edge even at reduced flows, minimizing inlet losses. Support casing with shaft Support casing Vaned diffusers are used for high Mach number machines, in order to reduce the thermodynamic losses in the very high...

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Integral gearbox The integral gearbox consists of a bull gear and high speed pinions, with a single-helical gear mesh. Casing: The gearbox casing is horizontally split. The lower part is fixed to the baseplate and the compressor stages are fixed to it. The gearbox casings can be either cast or fabricated. Gear meshing: The gear unit can be rated in accordance with AGMA or with API Codes. The toothed portion of pinions is integrally forged with the shaft. The bull gear is shrunk on the low speed shaft. Shafts: The shafts are sized to transmit the gear rated power within the stress limits of...

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Lube oil system A force-fed lube oil system ensures that the journal and thrust bearings are properly lubricated. The system can be designed either according to API 614 or to API 672 and is suitable for continuous compressor operation. It generally consists of: • oil reservoir • steam turbine or electric motor driven pumps (main pump can also be driven by compressor/gearbox low speed shaft) • full-flow oil coolers • twin oil filter allowing cartridges to be changed during operation • automatic by-pass valve to control oil pressure at the bearing manifold • monitoring and safety...

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General Operation control Dynamic simulation The following methods are available to control flow and suction or discharge pressures under varying process conditions: compressor speed variation: this method is utilized when a compressor is driven by a variable speed driver discharge throttling: a valve is fitted in the discharge piping so that pressure at the compressor outlet nozzle may increase while maintaining the normal value downstream of the valve suction throttling: a valve is fitted in the suction piping so that suction or discharge pressure can be regulated according to the process...

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capability in the industry to perform tests under actual load and pressure conditions (including LNG and reinjection) for trains driven by gas turbines or electric motors. Research and development Research and Development plays an important role in GE Oil & Gas’s strategies and therefore receives substantial resources. One of the main objectives is continuous updating and improvement of existing products, to extend the state-of-art in the company’s traditional markets (e.g. natural gas, fertilizers, methanol, refining and chemical industries in general). New products are developed driven by...

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Global Services Customer service GE’s Oil & Gas business provides a complete set of services to support the entire centrifugal and axial compressor product line. We offer an extensive portfolio of proactive and interactive service products such as condition-based maintenance, Conversions, Modifications and Uprates (CM&Us) and Contractual Service Agreements (CSAs) complementing the traditional service offerings of OEM spare parts, repairs and field services. Our innovations are not limited to mechanical engineering. We have developed business solutions such as remote monitoring and...

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These compressors are used in air separation, synthetic fiber and fertilizer plants as main process gas compressors and in all industrial plants as service air compressors, and for the compression of CO2 in CCS/EOR applications. Drivers for this type of compressor are generally electric motors, but it is also possible to use steam and gas turbines (either as a direct driver or through an intermediate gearbox). Technical data The inlet flow for such machines can vary from 10,000 to 200,000 m3/h (6,000 to 120,000 cfm), with a max. discharge pressure of up to 200 bar (2900 psi). Package...

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