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Vika oxygen generator

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Vika or TGK is an oxygen generating system for spaceflight.[1] It is a SFOG, or solid-fuel oxygen generator, a kind of chemical oxygen generator.[1] It has been used on the retired Mir space station and the International Space Station.[1] It was originally developed by Roscosmos to supplement the Elektron oxygen system on Mir.[1] A Vika module, also known as a "candle", contains about one liter of lithium perchlorate and can provide oxygen for one person for 24 hours.[1]

The canister contains powdered sodium chlorate and powdered iron, which when combined burns to create enough heat and temperature to break down sodium chlorate into salt (sodium chloride) and oxygen.[2]

After being adopted for use on the ISS, it had the NASA name SFOG, but they also sometimes use the Russian acronym TGK.[1]

Vika on Mir

A man holding a piece of hose floats in front of a selection of transient space station hardware. He is wearing a gray-and-yellow plastic mask over his mouth and nose, a pair of goggles above his eyes, and a blue jumpsuit with a name patch on it.
Astronaut Jerry Linenger wearing a respirator mask following the 1997 fire aboard Mir from an SFOG fire

Vika was used on Mir when more than three people were on board.[3] Vika needs a supply of canisters to work, which must be flown into space.[3] An example of this is Progress M-34, which carried 60 canisters to Mir in 1997 along with other cargo.[3] If Vika and Elektron stopped working, the station would have to rely on a limited supply of bottled oxygen.[3]

The fire was a “raging blowtorch" ..

—Mir crewmember onboard during the fire[1]

In February 1997 a Vika chemical oxygen generator failed on Mir. It caught fire and spewed a torch-like jet of a molten metal and sparks across one of the Mir space station modules, burning for around 14 minutes and blocking the escape route to the docked Soyuz spacecraft.[1] The fire was eventually extinguished, and the crew was not harmed.[1] A definitive cause of the accident was not determined because the fire destroyed the device. It was suspected that a torn piece of rubber glove worn during assembly likely contaminated the canister.[1] Despite this incident, NASA decided it was still the best supplemental oxygen system available, and supported its use on the then-upcoming ISS.[1] The US and Russia worked together to improve the safety of the system before using it on the new space station.[1]

Vika on ISS

A backup to the temperamental Elektron system used on both the ISS and Mir is the Vika solid-fuel oxygen generator (SFOG), which contains a replaceable cartridge – a thin-walled steel tube with a three-part block of oxygen-releasing mixture based on lithium perchlorate. Two parts are tablets of the chemical mixture and the third one is the igniter tablet with a flash igniter. The igniter is struck by a firing pin when the device is activated. One cartridge releases 600 litres (160 US gal) of oxygen and burns for 5–20 minutes at 450–500 °C (842–932 °F).[4] The oxygen is cooled and filtered to remove dust and odours, and released into the space station atmosphere.[citation needed]

See also: ISS ECLSS

See also

References

  1. ^ a b c d e f g h i j k l Kerry Ellis - International Life Support - Ask Magazine
  2. ^ "Breathe deep: How the ISS keeps astronauts alive". CNET. 2015-03-19. Retrieved 2018-01-24.
  3. ^ a b c d David M. Harland (2004). The Story of the Space Shuttle. Springer Science & Business Media. p. 270. ISBN 978-1-85233-793-3.
  4. ^ Oxygen Generators
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