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: has anyone used the pressure vessel calculator here
: has anyone used the pressure vessel calculator here -- pat	Post Reply	Top of thread	Engineering Forum

Posted by: Marky ® 11/23/2009, 11:24:44 Author Profile eMail author Edit

Hi What's the ID of your vessel?

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: : has anyone used the pressure vessel calculator here
: : has anyone used the pressure vessel calculator here -- Marky	Post Reply	Top of thread	Engineering Forum

Posted by: pat ® 11/23/2009, 17:06:20 Author Profile eMail author Edit

sorry i ran 1,000 PSI internal pressure and 12" radius and got 0.5" wall thickness, when i ran 500 PSI i got .25 wall thickness, that seems awful high, is the calculator using a FOS, and if so what? is this using ASME boiler code? I don't care, i just need to know because i'm looking at design pressure of 200-400 PSI, and if it's got a FOS, i'm good.

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: : : has anyone used the pressure vessel calculator here
: : : has anyone used the pressure vessel calculator here -- pat	Post Reply	Top of thread	Engineering Forum

Posted by: Kelly Bramble ® 11/23/2009, 17:14:49 Author Profile eMail author Edit

In this particular calculator the FOS is determined by the "Maximum Allowable Stress value (psi)" value. This is the material yield. Also, consider that the weakest link is in the weld joint and another FOS is considered by the "Joint Efficiency". These PV calculators are really old and the mathematics foundation is likely ASME, however I cannot be sure.

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: : : : has anyone used the pressure vessel calculator here
: : : : has anyone used the pressure vessel calculator here -- Kelly Bramble	Post Reply	Top of thread	Engineering Forum

Posted by: pat ® 11/23/2009, 18:45:19 Author Profile eMail author Edit

so should i consider it as having no FOS other then what i either put in to the material stress lets say T6 aluminum 6061-T6 T6 temper 6061 has an ultimate tensile strength of at least 42,000 psi (290 MPa) and yield strength of at least 35,000 psi (241 MPa) if i set the maximum allowable stress in the calculator to by 17,500 and the design PSI to 200 PSI, then I'm getting a FOS of 2.0?

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: : : : : has anyone used the pressure vessel calculator here
: : : : : has anyone used the pressure vessel calculator here -- pat	Post Reply	Top of thread	Engineering Forum

Posted by: Kelly Bramble ® 11/23/2009, 19:23:59 Author Profile eMail author Edit

I think modifying yield numbers as you did gives a FOS 2.0 based on the mystery math the calculator uses. Engineers Edge should (and will) review the calculator and publish the math and engineering references as appropriate.

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: : : : : : has anyone used the pressure vessel calculator here
: : : : : : has anyone used the pressure vessel calculator here -- Kelly Bramble	Post Reply	Top of thread	Engineering Forum

Posted by: pat ® 11/24/2009, 14:44:11 Author Profile eMail author Edit

i suspect it uses the stress calculations for thin shells technique from ASME but doesn't let you directly set FOS. it'd be better if you could put the FOS in and the material bulk properties at 2% yield and then let it calculate all that.

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