10/13 Rule - Major Safety Issue!
The rule of 10/13 is based on ASME's requirement of hydrotest pressure of 130% of design pressure of Low presssure side of heat exchanger. The old 10/13 rule is now updated based on which, to avoid considering the tube rupture case, the corrected hydrostatic test pressure of the low pressure side should be equal to or higher than the design pressure of the high pressure side. In fact,appears API by this change has tried to generalize this rule for all exchangers regardless of they are manufactured based on ASME or other credible design codes with probable different design safety factors or different criteria for hydro test pressure calculation.
The corrected hydrotest pressure is defined as:
Pcorrected = Phydrotest x (Material stress at the overpressure scenario temperature / Material stress at the hydrotest temperature)
Where:
Pcorrected = Corrected hydrotest pressure, kPag
Phydrotest = Hydrotest pressure, kPag (The ASME Code for pressure vessels defines as 1.3*MAWP)
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With respect and joy to share free technical info,
Mihail
Пікірлер: 4
Nice
@mihaileditoiu
4 ай бұрын
Thank you!
Dear could you tell me the reason to consider 10/13? Or it is just a thumb rule
@mihaileditoiu
2 ай бұрын
The rule of 10/13 is based on ASME's requirement of hydrotest pressure of 130% of design pressure of Low presssure side of heat exchanger. The old 10/13 rule is now updated based on which, to avoid considering the tube rupture case, the corrected hydrostatic test pressure of the low pressure side should be equal to or higher than the design pressure of the high pressure side. In fact,appears API by this change has tried to generalize this rule for all exchangers regardless of they are manufactured based on ASME or other credible design codes with probable different design safety factors or different criteria for hydro test pressure calculation.