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  1. Katylee

    Low pressure vessel hydro test

    I should have also compared this same example using the 1.3DP basis: Shop stress during test = 0.2/0.5 x 1.3 = 52% Operating stress (corroded) = 0.2/0.3 = 67% This is a very undesirable situation and thats why we always insist on new and cold testing.
  2. Katylee

    Low pressure vessel hydro test

    Sorry metengr but I agree with codeeng. In our refinery we specify new and cold testing for all new construction. A rough example using the original 15 psig design: Calculated thickness: 0.2" Corrosion allowance: 0.2" Since we can't get 0.4" thickness we round up to 0.5" Test pressure =...

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