Author Topic: Artemis I Pre-Launch Testing at LC-39B (Leading up to and including all WDR's) (Read 128210 times)

Overwatchfan123 · « **Reply #280 on:** 06/20/2022 02:48 pm »

The transition to fast fill of the core stage is about 10 minutes away.

centaurinasa · « **Reply #281 on:** 06/20/2022 03:09 pm »

SLS/Artemis 1 (T-5h06m; 11:01am EDT): Hydrogen loading has NOT yet started; NASA says the team is chilling down an LH2 line leading to the SLS upper stage to minimize pressure spikes seen during earlier fueling attempts; not clear from NASA commentary when LH2 loading will begin

https://twitter.com/cbs_spacenews/status/1538901093010243585?cxt=HHwWgoCwlYCZo9sqAAAA

centaurinasa · « **Reply #282 on:** 06/20/2022 03:11 pm »

LH2 now on slow fill.

https://twitter.com/NASAGroundSys/status/1538902578112696321?cxt=HHwWgsC4hbnvo9sqAAAA

centaurinasa · « **Reply #283 on:** 06/20/2022 03:31 pm »

Curious about Charlie Blackwell-Thompson, Exploration Ground Systems'
@NASAArtemis
Launch Director at helm for today's wet dress rehearsal activities? Bookmark this podcast!

https://twitter.com/NASAGroundSys/status/1538904918643326977?cxt=HHwWgoCyrdf3pNsqAAAA

centaurinasa · « **Reply #284 on:** 06/20/2022 03:32 pm »

LH2 now on fast fill.

UPDATE: The team has entered liquid hydrogen fast fill into the core stage of
@NASA_SLS.

https://twitter.com/NASAGroundSys/status/1538907754856947712?cxt=HHwWgIC95eKcptsqAAAA

centaurinasa · « **Reply #285 on:** 06/20/2022 03:35 pm »

NASA confirms the liquid hydrogen load has transitioned to “fast fill” on the core stage of the SLS moon rocket.
This moves the countdown rehearsal past the point where the launch team detected a hydrogen leak in April.

https://twitter.com/SpaceflightNow/status/1538907317718114304?cxt=HHwWgICz7amDptsqAAAA

SLS/Artemis 1 (T-4h37m; 11:31am EDT): NASA reports liquid hydrogen is now in fast fill; no leaks reported, indicating work to fix a fuel-line attachment fitting at the base of the rocket was successful

https://twitter.com/cbs_spacenews/status/1538907885144526849?cxt=HHwWgsCywa2kptsqAAAA

centaurinasa · « **Reply #286 on:** 06/20/2022 03:38 pm »

SLS/Artemis 1 (T-4h33m; 11:34am EDT): NASA commentator Derrol Nail reports the core stage liquid oxygen tank is now 38% loaded while liquid hydrogen is at <5%, but now in fast-fill mode; fingers crossed!

https://twitter.com/cbs_spacenews/status/1538908703067455490?cxt=HHwWhIC-wfvTptsqAAAA

centaurinasa · « **Reply #287 on:** 06/20/2022 03:48 pm »

Right now, LH2: 20 %, LOX: 46%

centaurinasa · « **Reply #288 on:** 06/20/2022 03:50 pm »

Next main event: second (ICPS) stage tanking...

Vahe231991 · « **Reply #289 on:** 06/20/2022 03:53 pm »

Quote from: centaurinasa on 06/20/2022 03:48 pm

Right now, LH2: 20 %, LOX: 46%

More progress made in filling one of the core stages with LH₂ than the April 14 WDR test! Fourth ~~Third~~ WDR test looking more and more probably the charm this time.

centaurinasa · « **Reply #290 on:** 06/20/2022 04:05 pm »

UPDATE:
@NASA_SLS
fast fill continues. LOX is currently at 58%, LH2 at 52%.

https://twitter.com/NASAGroundSys/status/1538915455292817408?cxt=HHwWgICywf_cqdsqAAAA

SLS/Artemis 1 (T-4h00m; 12:07pm EDT): LH2 at >52% loaded; LOX at >58%; NASA commentator Derrol Nail: "things are looking good so far"

https://twitter.com/cbs_spacenews/status/1538917267207073795?cxt=HHwWhsC9qbvGqtsqAAAA

centaurinasa · « **Reply #291 on:** 06/20/2022 04:26 pm »

UPDATE:
@NASA_SLS
is currently at 67% LH2, 63% LOX.

https://twitter.com/NASAGroundSys/status/1538918521257730056?cxt=HHwWkICx3bqPq9sqAAAA

cplchanb · « **Reply #292 on:** 06/20/2022 04:39 pm »

It's interesting how the hydrogen fill started much later behind oxygen yet it has now surpassed it in fill volume. Is there a reason for that?

centaurinasa · « **Reply #293 on:** 06/20/2022 04:40 pm »

UPDATE: Cryogenic propellant loading continues into the core stage of
@NASA_SLS
. We are currently at 76% full with LOX and 98% full with LH2. LH2 fast fill has stopped, and we have transitioned to liquid hydrogen topping.

https://twitter.com/NASAGroundSys/status/1538924226467532802?cxt=HHwWhMC47cXbrdsqAAAA

2024MoonShot · « **Reply #294 on:** 06/20/2022 04:41 pm »

Hydrogen is lighter and less denser than oxygen thus it fills at a faster rate.

centaurinasa · « **Reply #295 on:** 06/20/2022 04:46 pm »

UPDATE: LOX now 80% full, LH2 holding at 100% full and in replenish mode.

https://twitter.com/NASAGroundSys/status/1538925379557150720?cxt=HHwWgMCyhdWertsqAAAA

centaurinasa · « **Reply #296 on:** 06/20/2022 04:49 pm »

Waiting for ICPS tanking, now...

SWGlassPit · « **Reply #297 on:** 06/20/2022 04:53 pm »

Quick little gif I threw together to show how much the core stage shrinks due to the thermal contraction during cryo load

Edit: you'll have to click to the picture to get the animation to play

centaurinasa · « **Reply #298 on:** 06/20/2022 05:03 pm »

Some venting...

centaurinasa · « **Reply #299 on:** 06/20/2022 05:05 pm »

Second stage now in chilldown (slightly behind schedule)

UPDATE: Interim cryogenic propulsion stage (ICPS) is now in chilldown for liquid hydrogen.

https://twitter.com/NASAGroundSys/status/1538930918748049408?cxt=HHwWgMC-nYvhsNsqAAAA