Vacuum Catalogue - Edwards

Deaeration EquipmentMultistage Ejector/Liquid Ring PumpCombinationsEdwards are able to offer combinations of steam ejectors and liquidring pumps where the liquid ring pump replaces the final stage orstages of a steam ejector system.This enables large vapour/gas flows to be handled at the lowpressures associated with multi-stage steam ejector sets whilstsubstantially reducing steam consumption and hence operatingcosts.Ejector and ejector liquid ring pump combinations can be suppliedusing Edwards designed liquid ring pumps. The depth of experiencein both types of equipment allows optimisation of the equipment bothin performance and economy of utilities.Applications and Design ServicesEdwards offers a comprehensive design service based on unrivalledprocess vacuum experience, application knowledge and designcapabilities.In order to propose a solution the following information is required atthe enquiry stage:• Suction flow• Composition and Molecularweight• Suction pressure• Discharge temperature• System volume• Evacuation time• Discharge pressure• Motive pressure andtemperature, max-normal-min• Cooling water temperature,max-normal-min• Type of condenser direct orindirect• Type of installation Barometricor low level• Materials of construction• Design codes applicableEdwards experience in water deaeration equipment spans more than70 years, serving essentially two markets and applications:Seawater deaerators for water injection systems for secondaryrecovery of oil from offshore reservoirsBoiler feedwater and process deaeration for power generation plants,boilers and process useSeawater DeaeratorsSecondary recovery by means of water injection is frequently anessential feature of crude oil production. It is often a crucial factor inachieving and sustaining economically viable production rates.The source of the water is dependant on the location of the productionfacility and could be from a subsurface source such as producedwater or an aquifer, or from a surface source such as the sea or ariver.The latter two sources, as with most surface waters, normally containsubstantial levels of dissolved oxygen. In order to control corrosionrates in downstream plant and to inhibit bacterial growth this oxygenmust be removed before the water is used for injection.Edwards is able to provide extensively proven deaeration technologyto facilitate the removal of this oxygen to levels such that theremaining residual may be economically removed by the addition ofa chemical scavenger.The following options are available:• Spray/pack deaerators• Packed column deaerators• Trace gas stripping deaeratorsSpray/pack DeaeratorsAlthough conventional packed bed deaerators offer a satisfactorysolution in many circumstances, the unique Edwards spray packeddeaerator technology offers significant advantages over conventionaldesigns. It affords additional benefits for FPSO installations becausethe mass transfer efficiency of the spray section is unaffected bywave motion and by any foaming of the water as it enters thedeaerator.6112Page4555421 First stage vapour take-off 4 Recycle2 Oxygen scavenger 5 Second stage vapour take-off3 Water outlet 6 Water inlet3Shop online at www.edwardsvacuum.com