And it appears they set the grass on fire again.
The leak went to 7% concentration but then dropped to 0.5%. Seven percent is quite worrisome given the lower explosive limit (LEL) for hydrogen is 4%. At 0.5% it shouldn't be a big deal unless it can find an area to collect and concentrate to higher levels.Used to work with hydrogen gas plumbing many years ago. It required attention to detail for sure. My hydrogen gas leak detector sure got a workout in those days.
It didn't exactly drop after going to 7% they completely recycled the LH2 loading and changed the loading procedure to see if that would help. Appears to so far have done so. At 36% load still at less than than 1%.
Leak shot up, now above 4% but stable.Despite that they're calling the test a success
Where's the kaboom? There's supposed to be an earth shattering kaboom! Brad
United Launch Alliance (ULA) will launch the NROL-91 mission for the National Reconnaissance Office (NRO) atop a Delta IV Heavy. Launching from Space Launch Complex 6 at the Vandenberg Space Force base, in California, this mission will mark the final Delta IV Heavy launch from the west coast and the third-to-last Delta IV Heavy launch ever. ULA is retiring both the Delta and Atlas vehicles in favor of Vulcan, which is scheduled to have its maiden launch in Q1 2023.
