Let it be required to design a circular tank of 20 feet internal diameter and inside depth 

 of 20 feet. It is desired to know the reinforcement in the same and Me thickness of the 

 outer shell. From table 1, page 116, there is obtained the following data:- 



#-075 



30 



50 



40-40 



The first line l /i - 075 gives the fractional part of the sheet, constituting the top layer 

 of reinforcement, which in this case is 3-13-075. The second line gives the size of the 

 next reinforcing sheet 3-9-30. The third line gives the next size sheet 3-6-50. The last 

 line calls for two sheets of mesh 3-640 at the bottom of the wall. The correct position 

 of the reinforcement is shown in Figure 37. It should be remembered that the width of 

 the sheet (the short direction of the diamonds) is the vertical direction of the sheet in the 

 outer shell and the length of the sheet (indicated by the Jong direction of the diamonds) 

 is the horizontal direction of the sheet. The sheets of mesh should be lapped eight inches 

 or more, as the case may be, on the ends, and three inches or more on the sides. 



Let it now be required to ascertain the thickness of the outer shell. From table 2, 

 the thickness given in inches of a tank 20 feet in diameter and 20 feet in depth is 8 inches. 

 The thickness at the top is in every case 4 inches. The inside face of the wall may be 

 battered as shown in Figure37, or be stepped off in even inches at the height indicated 

 in the table. It may even be deemed expedient at times to make the wall of even thick- 

 ness throughout. 



The details of a circular tank will be noted from Figures 3 7 and 38. The thickness of 

 the floor of a tank resting on hard ground should be equal to the thickness of the outer 

 wall at the bottom, as given in table 2 except that it need not be more than six inches on 



Circular 

 Tanks. 



Details. 



