Re: Artemis 1 (EM-1)
Napsal: 4.9.2022 13:25
Mimochodem, problém s netěsností plnícího potrubí na těch odtrhávacích spojích měli za následek zpoždění několika STS misí, viz
As the ET is filled, excess gaseous hydrogen is vented through umbilical connections over a large diameter pipe on an arm extended from the fixed service structure. The connection for this pipe between the ET and service structure is made at the ground umbilical carrier plate (GUCP). Sensors are also installed at the GUCP to measure hydrogen levels. Countdowns of STS-80, STS-119, STS-127 and STS-133 have been halted and resulted in several week delays in the later cases due to hydrogen leaks at this connection. This requires complete draining of the tanks and removal of all hydrogen via helium gas purge, a 20-hour process, before technicians can inspect and repair problems.
https://en.wikipedia.org/wiki/Space_Shu ... ernal_tank
As the ET is filled, excess gaseous hydrogen is vented through umbilical connections over a large diameter pipe on an arm extended from the fixed service structure. The connection for this pipe between the ET and service structure is made at the ground umbilical carrier plate (GUCP). Sensors are also installed at the GUCP to measure hydrogen levels. Countdowns of STS-80, STS-119, STS-127 and STS-133 have been halted and resulted in several week delays in the later cases due to hydrogen leaks at this connection. This requires complete draining of the tanks and removal of all hydrogen via helium gas purge, a 20-hour process, before technicians can inspect and repair problems.
https://en.wikipedia.org/wiki/Space_Shu ... ernal_tank