Flow calculation

[rsr32]

Hello,

I have a 30,000 Gallon LPG tank about half full, that will be emptied into an empty second tank, through a piping arrangement. The first tank is pressurized using a compressor. The differential pressure created between the two tanks is 100 PSID

I am trying to figure out an expected flow rate (GPM)at the discharge of the piping going into the tank to be filled

I've attached a sketch, which has layout and sizing information.

also to note, there are excess flow valves at the piping intakes in each tanks, that will shut the flow off at a certain threshold. Unfortunately, the specs on the valves is not known, but I assume they must still be accounted for for friction loss in the head loss calcs.

I am not sure about how to account for the head loss in the entire system. I am using a bernoulli equation but am running into problems in solving it.

As can be seen by the diagram, the 2 inch piping dumps into a 3" header, then back into a 2 line to the second tank, with valves and elbows along the way. All valves, fittings, and piping seams are welded. An approximation is really all that is needed and in fact, all i need to prove is that the flow rate will be at least 250 GPM or more

Any help with this is greatly appreciated,
Thanks,
Dan

 

[SNORGY]

Crane TP 410 / 410M if you have a copy.

I would otherwise use anything up to about 250 diameters for the 90-degree globe, fully open.

Regards,

SNORGY.

 

[chicopee]

Latexman, I don't think he meant compressor, otherwise,he'll blow this compressor to "bits and pieces" trying to transfer the liquid propane.

RSR2, yes Bernouilli's equation should work fine. Assuming 100 gpm transfer rate, f=.01875 or higher; K=42' for 3" internal valve(assumed as no value is available from mnfctrs.) and strainer;18' for 90d elbows;8' for 45d elbows. Whatever value is obtained for pump HP, tak on a 20% increase.