Thick vs. Thin walled pressure vessel
Thick vs. Thin walled pressure vessel
(OP)
Could someone please explain the criteria for what constitutes as a thick walled and thin walled pressure vessel. Also, is the hoop stress and longitudinal stress formulas valid for both?





RE: Thick vs. Thin walled pressure vessel
I would have to say that the design equations do not apply equally for thin and thick shells. Thin shells assume a constant membrane stress through the thickness. In a thick shell vessel, the largest stress will be at the ID. Divison 3 of the ASME Code Section VIII covers thick wall vessels. I don't have that part of the code but maybe it contains additional information that defines thick wall vessels.
RE: Thick vs. Thin walled pressure vessel
RE: Thick vs. Thin walled pressure vessel
RE: Thick vs. Thin walled pressure vessel
Please note that as mentioned above generally thin walled vessels are classified as one where R/t>10. But the ASME Code formula given in UG-27 takes care upto R/t > 2. It means upto some extent Thick wall vessels can also be computed using ASME Code Formula. In fact the modification factor 0.6*p in the denominator of ASME code formula brings membrane stress thin wall formula more close to Lame's Equation for Thick walled Vessels.
If You want to check in Depth, please refer Chapter-14 of Process Equipment Design Book by Brownel & Young.
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