What is the pressure drop through an 8" X 2" sch 80 laterolet (in either direction) in a system where system pressure is 2000 psi, flow in the 8" line is 1250 BPH, flow in the 2" sch 80 line is 20 gpm, and the 8" pipe is sch 20 pipe? All mtl. is C.S.