I have two reactors(R-1 & R-2).i have 240 Lts of maas in R-1.now i want to add this 240 lts to R-2 in 4 hrs by nitrogen pressurization at R-1 and the addition flow is controlling with control valve.the pipe lenth between R-1 & R-2 is 4 Mts and line size is 15 NB.

Now i want to calculate how much nitrogen pressure is required to transfer mass from R-1 to R-2 with 60 Lts/hr.

as per my Knowledge we have to calculate pressure drop accross 3 places i.e

1.amount of pressure required to transfer from R-1 to R-2

2.Pressure drop Across crol valve

3.back pressure in R-2 Ractor

The amount of Nitrogen pressure should be greater than sum of above 3.

So please reply back with how much nitrogen pressure is required to transfer mass from R-1 to R-2 with 60 Lts/hr.