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    MrPastry Posts: 1, Reputation: 1
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    May 29, 2013, 04:39 AM
    What is percentage by mass ?
    I have been told that I need a gas mix of 65% Helium & 35% Nitrogen
    For a pressurisation job (10.6 Bar.g)
    What is this by volume ?
    I will be pressurising using a Nitrogen pump

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