Farid, thank you very much! I round API 2510 as guidelines for the vapor space. I am specifying a can pump for this service, so LL liquid level don't have to as high.
Regarding the low design temperature, if I flash propane to atm I got -45°F. I saw this was specified as the lower design temperature for propane bullets, so low temperature carbon steel has to be used. However, it was not specified for propane sphere. Any comments on this?
Regards,
Leo
Yes.you use can pump and if I not mistaken we call it as vs6 pump. Let say you want to have lower ll level, then can have to be longer in order to gain the static head and increased the npsha. But the longer the can the expensive the pump.so this is your task to do sizing the tank and pump, set the minimum level so that the pump never cavitate.
Regarding the material, just refer the material spec design temperature. If it can be operate at ambient and flushing temperature it should be OK. Same goes to piping. Because flushing to flare at pipe line also possible.
Edited by farid.k, 09 April 2015 - 05:45 PM.