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Starship SN7
Structural Test Article
Starship SN7 was a small prototype tank designed to test a new steel alloy (304L) and welding techniques. It was tested to destruction on two occasions – reaching a record pressure on the second attempt.
Destroyed

History

Pressurize to Failure #2
The Starship SN7 test tank is believed to have achieved a record pressure during its second cryogenic proof test to failure. However, SpaceX has not officially confirmed the pressure that it reached.
Test Tank Pad, Starbase, Texas, USA
Tue Jun 23, 2020
Pressurize to Failure #1
The Starship SN7 test tank achieved 7.6 bar before it sprung a leak during a cryogenic proof test to failure. Following the test, the test tank was repaired to allow for another attempt.
Test Tank Pad, Starbase, Texas, USA
Mon Jun 15, 2020