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18 WATER CHILLER 19 LIQUID COOLING GARMENT HEAT EXCHANGER HYDROGEN TANK LIQUID OXYGEN ORBITER LIQUID OXYGEN ORBITER LIQUID OXYGEN SLOSH LIQUID OXYGEN INTERTANK TANK UMBILICAL PLATE Figure 2-17.—Space Shuttle Extemal Tank. HYDROGEN TANK PRELAUNCH COOLANT LOOP UMBILICAL SERVICE PANEL (DISCONNECTED — AT T — 2 hours of cumulative firing time. Each engine develops a vapour, to.