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I'm spec'ing a large propane tank (18,000 gal), and it seems like the industry standard in the US is to use a design temperature and pressure of 125 F and 250 psig. The vapor pressure of pure propane is ~247 psig at 125F, which would explain these values, but commercial propane can have lighter hydrocarbons and a higher vapor pressure. In fact, NFPA 58 lists a vapor pressure for commercial propane of ~300 psig at 125F (interpolating, Annex B). Meanwhile the ASME Code says the design pressure should be based on the design temperature (max). Does anyone know the reason for the appare