Document Rp8DLO8RknK3xY1g6NydMqX1a

From Monsanto Che: cal Company At Texas City, Texas " May 4, 1951 W. E. Alexander -14-- W, H. Slager -1 R. G. Powell -1 Reading Pile -1 Job Pile To Mr. J. H. Worth At Texas City, Texas Reference Subject il 1*1) \__1 PROCESvScmDE5S?lIGA!NntDATA SHEET, DEPARTMENT!' 22 y AfO.Vc./ I'M r_l In reply to your memo of April 24 covering various process design data sheets for Department 22, I have the following comments: 1) Pump 22P20 has been discussed with you previously and I believe that we are in agreement that the capacity should be increased to approximately 200 gpm to reduce pump-out time of the VCM Rundown Tanks. 2) Pump 22P22 Is indicated for intermittent operation, about 10 minutes every two hours. It Is my belief that a pump handling hot tar bottom such as this pump will give better service If it operates continuously with recycle and off - on flow control for the sump level. 3) The materials of construction for the majority of the pumps appear to be cast iron casing and an alloy impeller and shaft. I should appreciate your requesting that General Engineering advise us as to the reasons for the selection of this combination ox' materials. 4) I note that for surge tanks they have indicated a surge time equal to the gross volume o- the tank divided by the gpm inflow. I believe that this leads to an erroneous under standing as to what is the practical surge time available. In all probability the tanks will normally be controlled at a half full level so that the available surge, in case either the inflow or outflow is stopped, becomes only half the gross capacity. I feel that in some cases the surge time based on half the gross capacity is probably inadequate. In particular, 22So, 22T3 and 22T6 might be subject to further consideration. AWA/vc A. W. Andrews, Jr. IT! in 10 RSV0030426