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In situ cell maintenance was considered impractical for the SFWEM from a weight and volume penalty point of view Each cell in an independent type of construction would have to be designed to withstand the high pressure operation. Individual fluid fittings are bulky and would add to the complexity of the system,thereby,decreasingreliabi-lity. Ifaseriesofterlssharecommon endplates, as in bipolar plate construction, one cell lost in the center of the electrolysis stack cannot be electrically removed from the system. The second option, maintenance of an entire module, is therefore projected as the most desirable. The overall subsystem maintenance concept derived and proposed is as follows If a component failure does not endanger the immediate safety of the crew, no installed redundancy is required for that component each component in the SFWES can be replaced in less than two hours and the capacity for 02 of the cabin typically allows for downtimes in excess of 24 hours. OGS Weight and Power Summary Table 9 presents an overall weight and power summary of a three-man subsystem based on the SFWE state-of-the-art technology (1976) weight and power summary is presented for 1980 technology Single Cell Developments Single cell development activities for both SFWfb These activities were divided into two areas* For comparison a projected and DM cells were performed * SFIVE single cell technology and hardware improvements * Dehydrator single cell technology and hardware improvements SFWE Single Cell Technology and Hardware Improvements The following SFWE single cell technology and hardware improvements were completed * * * * * * * SFWE single cell cross sectional schematic Critical feed diameter analysis and implementation High current density nickel (Ni) current collectors Insulation plate with internal cooling Square cathodes Correction of cell frame warpage O-rings with reduced compression set SFWE Single Cell Cross-Sectional Schematic The functional cell schematic was presented in Figure 1. A cross sectional schematic showing details of the cell hardware is shown in Figure 10. The metallic structural parts are fabri cated from high tensile strength Ni. The cell housing is injection molded polysulfone. The matrices are LSI reconstituted asbestos and the electrodes 30 This is possible since Lie SYSteNM. Inc.PDF Image | STATIC FEED WATER ELECTROLYSIS PROCESS
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