Pressure Drop Calculations for Condensate Flow in Chemical Engineering

10 Rules of Thumb for Chemical Engineers cally to select a 112 in for a 028psi100ft pressure drop Note that the velocity given by this lines up if 165fts are used on the insert at the right read up from 600psig to 200psig to find the velocity correction factor 041 so that the corrected velocity is 68fts Lockhart and Martinelli Example Given Saturated 600 psig condensate flashed to 200 psig 112 in line sch 80 ID 1500 in Flow 1000 lbhr The X range for Lockhart and Martinelli curves is 001 to 100 For fog or spray type flow Ludwig1 cites Bakers6 suggestion of multiplying Lockhart and Martinelli by two For the frequent case of flashing steamcondensate lines Ruskan7 supplies the handy graph shown above This chart provides a rapid estimate of the pressure drop of flashing condensate along with the fluid velocities Example If 1000lbhr of saturated 600psig condensate is flashed to 200psig what size line will give a pressure drop of 10psi100ft or less Enter at 600psig below insert on the right and read down to a 200psig end pressure Read left to intersection with 1000lbhr flowrate then up verti