According to Musk, test tank #1 made it all the way to 7.1 bar (105 psi) before it burst and test tank #2 reportedly did even better. Will be repaired & retested at cryo," Musk explained to his 30.9 million Twitter followers. The stress test was conducted at SpaceX’s facility located in Boca Chica, Texas, and the test focused on applying pressure to the fuel tank until the point of failure. The Starship's test tank reached an internal pressure of 8.5 bar, or about 8.5 times the pressure of Earth's atmosphere at sea level, SpaceX founder and CEO Elon Musk tweeted after the test… "Starship 9m test tank made 7.5 bar at room temp! This test comes on the heels of a less intense pressure test for the same tank, which resulted in a burst weld that was subsequently corrected, paving the way for the good test on Tuesday evening. From memory, SpaceX were looking for a 140% margin over the normal 6 bar for this pressure test. Meanwhile, SpaceX’s South Texas team has already finished and partially tested a second Starship test tank , ultimately reaching 7.5 bar with water before a … SpaceX has completed a key test necessary for development of its next Starship prototype – stress testing a fuel tank to the point of failure, at its Starship development site in Boca Chica, Texas. At a bare minimum, a test that failed to reach Starship’s minimum flight pressure of 6 bar (90 psi) would be of dubious value for the actual orbital ship. A test flight could be just around the corner.

One tank was tested until destruction on January 10, reaching a pressure of 7.1 bar. So it sounds like 8.5 slightly exceeds their hopes. So it sounds like 8.5 slightly exceeds their hopes. Starship SN4 marked the most recent failure during SpaceX’s hardware-rich development program. The test SpaceX completed on Tuesday was designed to see how much pressure the tank could withstand before failure, and Musk said on Twitter that it achieved a max pressure level of 8.5 bar … SpaceX has completed a key test necessary for development of its next Starship prototype -- stress testing a fuel tank to the point of failure, at its Starship development site in Boca Chica, Texas. SpaceX Starship prototype SN3 was destroyed during a pressure test early this morning, producing a massive cloud of steam before the vehicle crumpled and collapsed. The vehicle endured pressures of 4.9 bar during that earlier test, compared to 7.5 bar over the weekend, Musk said.

This marks an important moment in the Starship program. I believe I remember folks saying that the Falcon 9 also has that minimum 140% requirement - so they are working towards that with Starship.