![]() ![]() These will be set below the tank design pressure and MUST have the required flow capacity at the tank design pressure. Your tank will have one or more pressure vents to address thermal outbreathing and pump-in rates.You will need to read API 650 or find an experienced engineer to help you, if necessary. There are other scenarios available in which a higher pressure can be specified. Do the math using a steel density = 490 lb/ft3 and the max pressure = 1.47" H2O = 0.85 oz/in2. API 650 says in 1.1.1 that the tank may not have an internal pressure greater than the weight of the roof plates.I am also going to assume you have a low-pitch cone roof.ASME stands for Always, Sometimes, Maybe, Except. I am familiar with API 650 Welded Tanks for Oil Storage so my comments will be based on this (and there are always exceptions, just like the ASME codes. ![]() You can even do this yourself if you want to all the vent vendors have software available (I usually let them do the work!) You determine the setpoint and the flow rates, then let the vendor select the vent. ![]()
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