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  1. #66
    Join Date
    Aug 2010
    Posts
    1,764
    Re-visiting here with notes for my own reference as well as for others:
    Internal volume of 30 lb R22 is about 1/2 cubes including expansion space (calculated)
    Tare weight of bar handle jug at 0psig : 6.13 lbs

    About 13oz left at 70 psig (almost 3% of 30 lbs)
    2.3 oz at 0 psig
    1.2 oz at 15" Hg

    On a side note, unopened National brand 410A (25 lbs) was found to weigh 33lbs 6oz

  2. #67
    Join Date
    Aug 2010
    Posts
    1,764

    update with more accurate data

    I was able to get my hands on internal volume data from Worthington and R22 data from DuPont. Not much of a difference from what we had here.

    For 30 lb R22 DOT 39 disposables, the residual contents of R22 is as follows:

    at "until it won't push into A/C anymore" @ 70 psig
    11.4 oz

    1.15oz @ 50kpa(~15" vac)
    0.25oz @ 10kpa (~ 27" vac or 90% vac), which


    For 50 lb R22 cylinder:
    19.1oz (@ 70 psig)
    1.91 oz @ 50kpa (15" vac)
    0.45oz @ 10kpa (27" Hg / 90% vac)

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