Draw rate signal generator

A draw rate signal generator for an atmospheric crude distillation unit receiving crude oil and providing removed product streams 1 through 5 and a reduced crude oil comprises flow rate sensing means for sensing the flow rates of the crude oil and of streams 1 through 4 and providing signals FRC, FR1, FR2, FR3 and FR4, respectively, corresponding thereto;

• analyzing means for sampling the crude oil entering the distillation unit and providing signals DC, G and P corresponding to the 35% point temperature, the API gravity and the vapor pressure of the crude oil;
• end point analyzer means sampling streams Nos. 1 and 3 and providing signals D1 and D3B, respectively, corresponding to the end points temperatures of streams Nos. 1 and 3, respectively;
• 50% point analyzer means sampling streams 2, 3 and 4 and providing signals D2, D3A and D4, respectively, corresponding to the 50% point temperatures of streams Nos. 2, 3 and 4, respectively;
• and draw rate signal means connected to the flow rate sensing means, to the crude analyzing means, to the end point analyzing means and to the 50% point analyzing means for providing signals R1 through R5 corresponding to the draw rate for streams Nos. 1 through 5, in accordance with signals from the sensing means and all the analyzing means.