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Ambient pressure and relatively high current densities were chosen for the aerosol test because this was considered the worst case. Higher pressures tend to keep large gas bubbles from evolving from the electrode surfaces, carrying less electrolyte into the product gases. Higher current densities would generate more vigorous bubbling, therefore, more chance for aerosol formation. In summary, the detailed, comprehensive tests with a one-man capacity module, showed that a 24-hour break-in period effectively eliminates all aerosoling. Peripheral Component Improvements Under this part of the program, LSI evaluated and improved selected OGS compon ents. Specifically, the following components were included * Pressure Regulators * Module Coolant Pump Pressure Regulators. The first OGS components studied were the pressure regulators used for product gas pressure level and differential pressure control. An off-the-shelf modified design was evaluated and a customized pressure control technique evaluation was initiated. Off-the-Shelf Modified Design. A vendor search was conducted to determine if an off-the-shelf regulator type was available that could meet the following specifications 1. AllwettedpartstobestainlesssteelorTeflon. 2 Pressure differential control capability to 3.4 kNdm2 (0.5 psid) over a range of pressure from ambient to 2760 kN/m- (400 psia). 3 Control capability for both the low density H2 and higher density 02 One regulator's characteristics were sufficiently close to the desired specifi cations that a subcontract was awarded to the vendor to deliver the regulators according to the specificat ns. Three regulators were purchased and tested in a one-man capacity OGS t-? During this testing the regulators demonstrated excessive pressure drifts and low reliability One regulator lost pressure control and caused damage to the module. Upon disassembly, the regulator was found to have been constructed contrary to the specifications. A detailed analysis of the failure and require ments was performed and design recommendations and specifications for a high reliability differential backpressure regulator suitable for water electrolysis operation was prepared and submitted to NASA Figure 6 is a cross section of the regulator pictorially demonstrating the findings, recommendations and/or corrective actions implemented. 19 £$il systems,Ac.PDF Image | STATIC FEED WATER ELECTROLYSIS PROCESS
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