not normally required. vessels and piping must be selected and designed to withstand the pressure and temperatures involved and comply with applicable codes and regulations. gaseous helium manufacture most commercial helium is recovered from natural gas through a cryogenic separation process. normally...
of the trips, thus avoiding an additional four flights (nearly two more days of flying). eat what you have to eat to be healthy. buy less stuff in general (including clothing). fly and take transit as you need to for work. in each case see what you can reduce and what better choices you can make without...
of the trips, thus avoiding an additional four flights (nearly two more days of flying). eat what you have to eat to be healthy. buy less stuff in general (including clothing). fly and take transit as you need to for work. in each case see what you can reduce and what better choices you can make without...
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