312 



STEEL BINS. 



CHAP. VIII. 



Coal, ore, etc., will give an angle of <f> = 40 if the material is dry, but if the material is wet 

 the angle of repose may be increased to nearly 90. 



Angle of Friction on Bin Walls. The values in Table X may be used in the absence of more 



accurate data. 



TABLE X. 



ANGLE OF FRICTION OF DIFFERENT MATERIALS ON BIN WALLS. 



Panels 12'-6* 



Typicotf Section through fixfofs* 

 FIG. 12. COKE AND STONE BINS, LACKA WANNA STEEL Co. 



Self-cleaning Hoppers. In order to have hoppers self-cleaning when the material is moist 

 it is necessary to have the hopper bottoms slope at an angle considerably in excess of the angle of 

 repose < or angle of friction </>'. 



