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SOUND SUPPRESSION WATER SYSTEM TEST

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Sound Suppression System Overview: A sound suppression system was installed on the pads and the mobile launcher platform to protect the orbiter and its payloads from being damaged by acoustical energy reflected from the platform during liftoff. Water stored in a 290-foot-high, 300,000 gallon tank on the northeast side of the pad is released just prior to the main engine ignition and flows by gravity to special outlets on the platform, including six 12-foot-high quench nozzles, or "rainbirds." Nine seconds after liftoff, peak flow rate is 900,000 gallons per minute. The system reduces acoustical levels within the orbiter payload bay to about 142 decibels, below the design requirement of 145 decibels. NASA's John F. Kennedy Space Center
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