WATER ELECTROLYSIS SYSTEM REFURBISHMENT

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WATER ELECTROLYSIS SYSTEM REFURBISHMENT ( water-electrolysis-system-refurbishment )

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2.7 COMPARISONOF 90-DAY AND 182-DAY TEST SYSTEM CONFIGURATION At the conclusion of the 90-Day Test, the Electrolytic Oxygen Generator wascompletelydisassembled(excludingelectronics)andall componentswere inspectedforevidenceofcorrosionorwear. Theprogramofrebuildingand refurbishing the unit in preparation for the 182-Day Test required certain changes in internal configurationto (1) incorporate design improvements recommended as a result of the 90-Day Test experience, (2) correct malfunctions evidenced in the 90-Day Test and replace worn components, and (3) provide for the new interface requirements of the 182-Day Test which differed from those of the 90-Day Test. 2.7.1 DesignImprovements A summary of the design improvements which were implemented for the 182-Day Test is presented in Table 4. 2.7.2 Refurbishment The following changes were made to correct known malfunctions and to replace worn components: o Positivetemperaturecontrolwasaddedfortheelectronicscold plate to prevent moisture condensation. o Theinternal28VDCpowersupplywhichhadfailedduetoexcessive operatingtemperaturewasremoved. Anexternal28VDCsupply connectionwas providedas a replacement. o Thehighcurrentelapsedtimemeter,allsolenoidandcheckvalves, and the water feed timers were replaced. o Afanwasinstalledintheelectronicschassisbecauseoftheaddi- tional heat loads of the new electronics circuits. o PlasticN2 purgelineswerereplacedwithstainlesssteeltoprevent gas diffusion. o Holdingcurrentwasprovidedforallsolenoidvalvestoreducetheir operating temperature. o TheplasticheatexchangerwasreplacedwithaKynar-coatedstainless steel unit. o TheanodesinModule1werereplacedwithexperimentalelectrodesof the type under development under Contract NAS-10405.5 37

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