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Why is the EMU space suit pressurized to 4.3 psi specifically?
Wikipedia claims that space suits that use pure oxygen are pressurized to 4.7 psi…
The Shuttle extravehicular mobility unit (EMU) has an operating pressure of 4.3 psi (30 kPa) and the Shuttle crew escape/launch/entry suits operates at a maximum of 3.5 psi (24 kPA). All Russian spacesuites, in comparison, operate at 5.8 psi (40kPa) to minimize or avoid decompression sickness or other risks…
U.S. Studies have indicated that people could rapidly decompress from 14.7 psi (1 atm) to 8pis (55 kPa) with minimal risk. Similar Russian studies viewed decompression sickness risk slightly differently. From 14.7 psi, a russian suit pressure of 5.8 psi (40 kPa) is judged to be sufficient to avoid decompression sickness after half and hour of breathing pure oxygen, which is approximately how long it takes to perform a suit checkout before going out to do an extravehicular activity. As a result, all Russian spacesuits feature a 5.8 psi operating pressure.
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To maximize spacesuit joint mobility and to minimize leakage and loads of the pressure suit, spacesuits are designed to operate at the lowest pressure consistent with other requirements. Hence all spacesuits systems provide a breathing atmosphere of 100% oxygen
Британский астронавт впервые выйдет в открытый космос 15 января 2016 года