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Ammonia Leak Outside ISS  
User currently offlineNoUFO From Germany, joined Apr 2001, 7966 posts, RR: 12
Posted (1 year 7 months 2 weeks 22 hours ago) and read 2962 times:

Station's power relies on ammonia coolant, and a couple of hours ago (Thursday May 9) the crew found that the ammonia of one cooling loop was leaking into space. This could lead to a shutdown of said cooling loop in about 48 hours.

According to NASA's press release ( http://www.nasa.gov/mission_pages/st...tions/expedition35/e35_050913.html ) the crew is safe, but Chris Hadfield tweeted the problem was serious. I understand the crew is normally asleep at this time, but they still seem to be up.


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8 replies: All unread, jump to last
 
User currently offlinezanl188 From United States of America, joined Oct 2006, 3590 posts, RR: 0
Reply 1, posted (1 year 7 months 2 weeks 20 hours ago) and read 2921 times:
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Any indication of exactly which component is leaking?

A Soyuz is scheduled to depart Monday leaving only one US astronaut aboard... Might be awhile before an EVA is possible, assuming they know what's leaking and have the resources to repair it.



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User currently offlineNoUFO From Germany, joined Apr 2001, 7966 posts, RR: 12
Reply 2, posted (1 year 7 months 2 weeks 8 hours ago) and read 2743 times:

EVA will be tomorrow (Saturday) by C. Cassidy and T. Marshburn.


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User currently offlinejollo From Italy, joined Aug 2011, 237 posts, RR: 0
Reply 3, posted (1 year 7 months 2 weeks 6 hours ago) and read 2699 times:

Quoting NoUFO (Reply 2):
EVA will be tomorrow (Saturday) by C. Cassidy and T. Marshburn.

EVA is time-critical because if the pressure drops too low the loop will auto-shut down, and the residual pressure may not be enough to produce the current stream of ammonia flakes, a simple and effective visual aid to pinpoint the leak. IIRC the latest such leak (late 2012) couldn't be found for sure.


User currently offlinezanl188 From United States of America, joined Oct 2006, 3590 posts, RR: 0
Reply 4, posted (1 year 7 months 1 week 6 days 20 hours ago) and read 2589 times:
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EVA plan is to eye ball the leak, however the PFCS (Pump Flow Control System) is suspect and they will replace if it's the source.

Marshburn had been scheduled to leave with the Soyuz on Monday. Apparently departure is on hold pending resolution of this problem.



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User currently offlinezanl188 From United States of America, joined Oct 2006, 3590 posts, RR: 0
Reply 5, posted (1 year 7 months 1 week 6 days 8 hours ago) and read 2505 times:
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Hatch open on the EVA


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User currently offlinezanl188 From United States of America, joined Oct 2006, 3590 posts, RR: 0
Reply 6, posted (1 year 7 months 1 week 6 days 6 hours ago) and read 2473 times:
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PFCS removed. No obvious leak indication. Going to get the spare.


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User currently offlinezanl188 From United States of America, joined Oct 2006, 3590 posts, RR: 0
Reply 7, posted (1 year 7 months 1 week 6 days 5 hours ago) and read 2457 times:
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New PFCS powered up and working. No leaks so far.


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User currently offlineNoUFO From Germany, joined Apr 2001, 7966 posts, RR: 12
Reply 8, posted (1 year 7 months 1 week 6 days 1 hour ago) and read 2406 times:

Good. That was "something to break the habit" as we Germans say and return home on Monday.


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