LPG Storage Inlet Nozzles

[srrwarren]

The oil refinery I'm located at uses 3 different types of inlet distributors on the bullet fill nozzles. The inlet nozzles are located on the bottom of the bullet taking feed off the process units. I'm baffled as to why there is so much variation. The most recent bullet doesn't have any inlet distributor. Does anybody know why an inlet distributor / baffle should be used, and if so, a basis on proper design?

We are looking to install a new bullet and are wondering what the correct way is.

Thanks

 

[dcasto]

The use of spray bars and distributors came into being in the mid to late 70's so the age of the tank has a lot to do with the different methods.

The whole idea is to get the system to equalibrium quicker. On trucks that load out LPG, they have a distribution system that sprays on the top side of the tank, the idea is to "knockdown" vapors so the relieve valve doesn't open because some noncondensables came out of equalibrium. Bottom distributors would be used if the feed were two phased with some gas entrained. By bubbling up, the gas can achieve equalibrium quicker.