VAPOR PRESSURE AT TOP OF LPG STORAGE SPHERE

[tommy11]

Hi,
what would be the LPG vapor minimum design pressure at the top of the sphere as per good engineering practice and which parameters are considered to fix it?

Thank's

 

[LittleInch]

Actual composition of "LPG" varies so you need to know this plus the maximum liquid temperature.

Then you can find the vapour pressure.

Rather basic question.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[georgeverghese]

Vessels holding non refrigerated LPG are specified with an upper design pressure of approx. 20barg. Generally, commercial grade LPG has a sat vapor pressure of about 14barg at 38degC. You can make a good first approximation by looking up sat vap pressure curve for pure propane, and find the sat vap pressure at the max normal operating day time temperature at your location.