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 The External Tank (ET) is the only non-reusable major component of the Space Shuttle system
- 154 feet long
- 27.6 feet in diameter
- Serves as the structural backbone of the shuttle during launch operations
- Contains and delivers Liquid Hydrogen (LH2) and Liquid Oxygen (LO2) propellants for the Orbiter's three main engines
Three structural elements
- The LO2 tank and LH2 tank pressure vessels are welded assembly of machined and formed panels, barrel sections, ring frames and dome sections
- The Intertank is a cylindrical mechanically joined assembly with flanges at each end for joining the LO2 and LH2 tanks
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