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  1. Freon66

    Low NPSHa brine pump

    Since the absolute pressure of the brine would be 5 to 25 torr, cooling would only cut down on this vapor pressure by few to several torr which would not translate in a useful NPSH gain, hardly a fraction of one inch. Luckily, some pumps out there work well with 1 to 2 feet of NPSH. Thus just...
  2. Freon66

    Vacuum service - wall thickness?

    Thanks roaling and MJC, your replies were useful. As per the reference/data below what would be the difference between yielding and buckling for "flat end caps", or are they nearly one and the same due to the symmetry? Thanks again, Freon66 ---------------- Roger Cortesi (SM...
  3. Freon66

    Vacuum service - wall thickness?

    Thanks SteveBraune and kenvlach The vacuum is almost 14.65 psig, not 0.05 psig (it is 0.05 psia) The brine solution is chromate inhibited. -40 to 50 C are the extreme ends, normally it is 0 to 35 C. The brine is lithium bromide 50 to 60 wt% with 0.3% chromate. No experience with how to...
  4. Freon66

    Vacuum service - wall thickness?

    Would appreciate to formula(s)/charts to measure minimum wall thickness for: 1) cylindrical shell (4 feet long), diameter 36" 2) flat plates/disks (to be used as ends) matching the cylinder OD (will be welded to shell ends). Operating vacuum 0.05 psia Material of construction SS304 flat...
  5. Freon66

    Low NPSHa brine pump

    Application: pumping LiBr solution to an absorption column at 0.1 psia. NPSHa available 1 to 2 feet. Target flow rate of brine 25 to 40 gpm. Any recommended pump type???

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