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  1. tono3

    Allowable overpressures for Multiple PSVs with staggered set-pressures

    That makes sense, thanks so much!!
  2. tono3

    Allowable overpressures for Multiple PSVs with staggered set-pressures

    Thanks so much for your reply! Please see a few clarifications: 1)The set pressure of the new PSV (P size) will indeed be 105% of the set pressure of the existing PSV (L size). I meant that the relieving pressure (Set pressure + Overpressure) of both valves to be equal. Considering 100 psig Set...
  3. tono3

    Allowable overpressures for Multiple PSVs with staggered set-pressures

    Hello, The staggered set-points of two (2) PSVs protecting the same vessel would mean one PSV is set at 100% of the Maximum Allowable Working Pressure (MAWP) while the second PSV is set at 105% of the MAWP. Consider the MAWP is 100psig for simplicity. The allowable accumulated pressure for a...

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