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Two vendors supplied the required O-ring sizes One vendor's O-ring took on a permanent compression set during extended testing and loss of seal resulted The other vendor's product was satisfactory but was unavailable in the precise size required A special mold was designed and fabricated and the proven compound was used to manufacture new O-rings The new 0-rings successfully sealed the cells and subsequent disassemblies showed minimal permanent set. Dehydrator Single Cell Technology and Hardware Improvements The dehydrator cell, as functionally shown in Figure 15, uses the same poly sulfone cell housing design as the SFWE cell. The original design incorporated a relatively thick electrode for the 02-evolving anode This electrode has beenreplacedwithahigherperformancebutthinnerelectrode. Thechanges needed to accommodate the new electrode were incorporated into the design as shown in Figure 15. A three-cell DM was assembled using the improved hardware. The DM is being stored for testing as part of the integrated SFWEM/DM endurance test scheduled for a later The overall activities * * * * SFWE Single time under this program. Program Testing program test requirements were divided into the following four SFWE single cell test stand construction SFWE single cell 30-day electrode test SFWE single cell 30-day high temperature test SFWEM/DM integrated 30-day endurance test Cell Test Stand Construction A low pressure test stand was designed and built to provide a test bed for single cell work. A schematic of this test stand is shown in Figure 16 The purpose of the test stand was to allow for comparative evaluations of high performance electrodes and high temperature compatible matrices. Neither evaluation requires high pressure operation. The low pressure approach also conserved program funds since high pressure equipment and the components required for pressure regulation increase construction costs At low pressures (ambient) operation, gas will build up in the feed water cavity To remove this gas, the feed water cavity fluid was recycled and the gas separated in a water accumulator for subsequent removal. SFWE Single Cell 30-Day Electrode Test During the previous SFWEM development program a single cell test was performed evaluating an advanced electrode (anode) catalyj.)that had previously shown much promise in lowering OGS power consumption.J The original substrate material for this advanced catalyst, however, deteriorated. 39 Li/c System. ~1e.PDF Image | STATIC FEED WATER ELECTROLYSIS PROCESS
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