I am trying to calculate the flow of nitrogen used to blanket tanks based on level indicators that are trendable on Aspen Process Explorer.
My knowns are,
Tank ID: 90 ft
Height: 32 ft
Diameter of N2 line to Tank: 1"
Set point of Pressure Control Valve: 0.5" WC
Inlet Pressure: 110 psig
delta P: 110 psig
Operating Temperature: 90F
Cv max: 40830 SCFH
Cv operating : 21031 SCFH
Volume of tank : 203574 ft^3
As the liquid level in the tank varies, the amount of nitrogen used to blanket the void space in the tank to keep pressure on it will obviously vary.
I am having trouble finding this flow to the tank and i am getting astronomical numbers for example 800,000 SCFH? Maybe I am making some wrong assumptions? I don't know.