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How to calculate the Hydrotest Hoop stress in AutoPIPE?
Give the following information:
Piping code = B31.3 - 2014
Ambient temp = 21 deg C
Units = SI
Start by looking at the following AutoPIPE help section:
1. Help > Contents> Contents Tab> Reference Information> Code Compliance Calculations> select the proper piping code & year and select the Hoop Stress section
2. Look for the Allowable stress section, typically near the bottom of the page (ex. Allowable Stress)
3. See the equation that AutoPIPE is using to calculate the allowable (ex. W.E.SH)
From the Pipe properties dialog find values for W and E (ex. both values = 1.00)
From the Pressure Temp tab on the grids find the respective value for SH as defined by the Hydrotest dialog (ex.
Perform the Calculation:
W = 1
E = 1
SH = 137.8951 N/mm^2
Compare to allowable documented for hydrotest case:
Note: See WIKI here for method of setting a custom allowable value for the combination.