I am checking the allowable internal pressure for a tank designed to API 650. The plant wants to add a nitrogen blanket and the process engineer wants this information in order to design the pressure-vacuum relief valve. I was using the equation in F.4.1, which includes the tank diameter, but does not give units for this variable. If I use 'feet' I come up with a pressure greater than allowable for API 650 tank construction. If I use 'inches' I get a rather small value (around 1 in-H20) which seems too low. So, what are the units for this calculation?
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