ASME/PED TEST PRESSURE
ASME/PED TEST PRESSURE
(OP)
How should be determinate pressure test value (PT) for carbon steel pressure vessel calculated acc. to ASME code + PED? It means expression f20/ft in equation PT=1.25.PS.f20/ft. Should this expression (f20/ft) be calculated acc. to ASME code or PED 97/23/EC annex 1 p.7 (min. [Re/1.5; Rm/3.5] or min [Re/1.5; Rm/2.4]).





RE: ASME/PED TEST PRESSURE
If you are designing to ASME Code then you should use the ASME allowable properties for the material (from ASME II Part D). For some of the materials I am familiar with, the ASME values are less than the limits specified in the PED anyway.
For hydrotest though you will likely find that the 2nd equation in the PED will govern, i.e 1.43 x [max allowable pressure], and material properties at temperature are not a factor.
Regards,
John
RE: ASME/PED TEST PRESSURE
Because some guys in case like above mentioned using allowable stresses from PED - f = min(Ret/1.5; Rm/2.4).
Regards
RE: ASME/PED TEST PRESSURE
I'm not certain about the allowable stresses included in the PED, but I think they come from the Harmonised Standard EN13445. From previous postings on related subjects I don't think they can be directly compared to ASME as I think the application of safety factors is different.
Regards,
John