Editing Space Shuttle external tank (section)

===Standard Weight Tank===
The original ET is informally known as the Standard Weight Tank (SWT) and was fabricated from [[2219 aluminium alloy|2219 aluminum alloy]], a high-strength aluminum-copper alloy used for many aerospace applications.

After [[STS-4]], several hundred pounds were eliminated by deleting the anti-geyser line. This line paralleled the oxygen feed line, providing a circulation path for liquid oxygen. This reduces accumulation of [[gas]]eous oxygen in the feed line during prelaunch tanking (loading of the LOX). After [[propellant]] loading data from ground tests and the first few Space Shuttle missions were assessed, the anti-geyser line was removed for subsequent missions. The total length and diameter of the ET remain unchanged. The last SWT, flown on [[STS-7]], weighed approximately {{convert|35000|kg|order=flip}} inert.