(As a frame of reference, a quiet home emits about 40 decibels of noise, amplified rock and roll music is about 120 db at 100 feet, and a jet plane gives off 130 db at 100 feet.)
Nine seconds after liftoff, 900,000 gallons of water per minute are spraying through the area to reduce the acoustical levels in the payload bay area to about 180 decibels (db).
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At main engine ignition, a torrent of water flows onto the mobile launcher. There are six 12-foot high nozzles, called rainbirds. Water stored in a 300,000-gallon elevated tank is released just prior to main engine ignition and flows to the launch platform outlets. The Sound Suppression System protects the orbiter and its payloads from being damaged by muffling acoustical energy - sound waves - that could crack and damage surfaces during liftoff. Water floods the launch area to muffle the sound energy. Damaged systems could lead to more fires because of those leaks and breaks. Sound waves can cause pipes to burst, walls to crack, and joints to loosen. Water keeps flames from spreading and prevents damage caused by sound waves. Thousands of gallons of water flood the launch area at the crucial moments surrounding ignition, serving two purposes.
When the fuel and oxidizer are combined, the result is a controlled explosion that launches the spacecraft. The external tank is actually two tanks in one, separating the LOX and hydrogen until the very last moment. The LOX and hydrogen are kept far apart on opposite ends of the launch area, and are pumped to the external tank just prior to launch. If these two substances should combine too soon, a major explosion would take place. Hydrogen is the fuel for the rockets that propel the Shuttle, and LOX is the oxidizer - the substance that makes the combustion occur. NASA stores 900,000 pounds each of liquid oxygen (LOX) and hydrogen at the launch area. Image to right: Fire safety is especially important during a shuttle launch because the Space Shuttle is surrounded by hundreds of thousands of gallons of highly combustible materials. Fire prevention is important everywhere, but when you think of the launch pads at Kennedy Space Center, where hundreds of thousands of gallons of highly combustible materials are handled, fire prevention takes on even greater significance. Dyce Payne) Mp3 Downloadġ4.Whether it's at home, school, or work, many people create a plan of prevention and response if a fire should break out.
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