ISS Oxygen Candle Update
NASA Space Station On-Orbit Status 1 June 2005
“Update on Solid-Fuel Oxygen Generator (SFOG) candles: Two more SFOGs (Russian: TGK) were used today, both successfully. As of tonight, a total of 19 candles of the old set have been decomposed on board since 5/20 (total attempts: 29 [i.e., 10 failures = 34.5% failure rate, instead of expected 20%]). With the actual failure rate, TGKs currently on board last for 25 days. Progress 18 (arrival 6/18) is manifested to deliver 42 “new” SFOGs (zero failure rate) plus 110 kg (242 lbs) of O2.”
NASA Space Station On-Orbit Status 31 May 2005
“Update on Solid-Fuel Oxygen Generator (SFOG) candles: Three more SFOGs (Russian: TGK) were used today, with one failing to ignite. As of tonight, a total of 17 candles of the old set have been decomposed on board since 5/20 (total attempts: 27 [i.e., 10 failures = 37% failure rate, instead of expected 20%]). With the actual failure rate, TGKs currently on board last for 24 days. Progress 18 (arrival 6/18) is manifested to deliver 42 “new” SFOGs (zero failure rate) plus 110 kg (242 lbs) of O2.”
ISS Crew Burn Two Oxygen Cartridges Daily, RIA Novosti
“Because of the limited lifespan of so-called solid fuel oxygen generators, or oxygen cartridges, the crew have burned two cartridges daily of late,” the official said.”
NASA Space Station On-Orbit Status 30 May 2005
“Update on Solid-Fuel Oxygen Generator (SFOG) candles: Of the old set, 24 have been used since 5/20 (9 failed), 82 remaining.”
