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Spirax Sarco recirculating feedwater spray systems type RFS are designed to provide additional flash steam condensing capacity on boiler feedtank applications. When the condensate return flowrate is high and the cold make-up flowrate is intermittent it is likely that valuable flash steam will be lost through the vent. To ensure that this flash steam is condensed it is often worthwhile to take feedwater from a relatively cool part of the feedtank and pump it to a spray nozzle. Approximately 20% of the feedtank content can be circulated per hour to provide this additional flash condensing capacity. By using a low energy pump the thermal efficiency of the feedtank can be. | Section Boiler controls and systems Feedtanks Steam injectors Level controls TDS blowdown controls Conductivity sensors Sample coolers HI Conductivity meters Heat recovery systems Blowdown vessels Vent heads Bottom blowdown systems Boiler controls and systems Certificate No. FM163 spir areo TI-P401-25 AB Issue 2 I ISO 9001 I Type DH Flash Condensing Deaerator Heads A simple low cost solution for deaerating boiler feedwater at atmospheric pressure Mixes hot and cold incoming flows Liberates oxygen and other gases Stainless steel for long maintenance free life Easy to install Description Spirax Sarco flash condensing deaerator head is designed to mix incoming flows of cold make-up condensate return and flash steam to the boiler feedtank. This mixing action is achieved by directing the downward flow through a baffle arrangement within the unit. This liberates dissolved gases from the cold make-up which are vented to atmosphere. The cold make-up inlet is fitted with a spray screen which diffuses the flow increasing its surface area to promote thorough mixing with the condensate and flash steam. A Spirax Sarco flash condensing deaerator head consists of three parts A mixing unit which is bolted to the top of the tank and is supplied with connections to customer specification for cold make-up condensate return flash steam from blowdown etc. An immersion tube which distributes the mixed fluids into the tank and has an integral plate flange which is sandwiched between the tank and mixing unit flanges. Immersion tubes are fully described in separate literature. Gaskets. Two gaskets are required one fitted each side on the immersion tube flange. They are ordered separately. Available types The mixing unit is available in five nominal diameters DN150 DN200 DN250 DN300 DN400 flanged to BS 4504 PN 16 or BS 1560 Class 150. Immersion tubes are available in diameters to suit the deaerator heads and lengths of 950 1200 1600 and