Document zoaN4EzojrDq4n6VyobmgOGGR

February 22, 1957 Koppers Company, Inc* Mr. Jack Hyde Chamber of Commerce Building Pittsburgh, Pennsylvania SU3JECT: Weirton Steel Company Weirton, West Virginia 12* Sintering Machine Dear Jack: Enclosed are two sets of heat transfer calculations for the insulated straight wall portions shown on our drawing P-21223-A* The insulation in these areas will consist of 3 3/V* insulating castable (H-W 85 or equal) and 1 1/2" of our Detrick Block* I have also enclosed copies of the conductivity curves for the block and castable. I took "K" factors for the brick from Harbison-Walker*s "Modern Refractory Practice", Pag 339j 1950 Edition, using the same values as for 70% Alumina. According to A1 Pierce this is acceptable, as 60^ Alumina is close enough to the 70% in conductivity. As you can see, I end up with an outside skin tempera ture of 211 F# Please let us know if there is anything more we can furnish you in the way of information. Very truly yours, M. H. DETRICK COMPANY WEE:GS Enc. i i Walter E. Eliman \