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Found 3 results

  1. 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 apparent discrepancy? As I see it, there are a few possibilities: The design temp of 125F is overly conservative and rarely seen in a white-painted tank. Commercial propane is rarely used in ASME vessels, and either high purity propane or a mixture of propane and butane is used instead. These tanks just burp off excess pressure through their relief valves on hot days. I'm inclined to spec a design pressure of 300 psig, but there should be a good explanation for why the standard practice is to use 250 psig.... I can't be the first one to run into this. Anyone have experience here?
  2. Hello all! I just created an account but have been lurking on this forum for quite some time. I recently passed the FE exam and am in need of some advice from fellow PE's and/or experienced individuals. I graduated in May of 2016 with a petroleum engineering degree. After graduation I could not find a job in that field, but was able to get an engineering role with an environmental/remediation company. I took my FE exam in April and passed. I have ambitions to become a fully licensed engineer, however I am unsure if going into a field I did not study in undergrad is the right decision. I am learning project management and work on estimating new projects (mainly remediation earthwork projects), so naturally my work experience would imply I should take the civil/construction or environmental PE exam when eligible. If I go this route, how difficult would the PE exam be for someone like me with little to no geotech, structural, and materials studies? How many of you guys/gals changed fields completely post graduation? I go back and forth in my mind about going for my masters in something more aligned with my current position, but I'd prefer to not go into more student loan debt. Any advice would be greatly appreciated.
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