390 



SEWERAGE 



DIMENSIONS OF SEWER PIPES 



The standard lengths of sewer pipes are 2, 2J, and 3 ft. The 

 latter is the most desirable, because it reduces the number of 

 joints in the pipe line. In diameter, they are made 4, 5, 6, 8, 

 9, 10, 12, 18, 21, and 24 in. Special sizes, such as 20, 24, 27, 

 30, and 36 in., are also carried by some factories. 



Thickness and Strength. The practice of factories is to 

 make pipe of two thicknesses, one known as standard pipe and 

 the other known as double-strength pipe. The accompanying 

 table shows the thickness that well-made pipe should have by 

 the custom of the best factories. 



THICKNESS OF SEWER PIPE 



DEPTHS OF SOCKETS FOR STANDARD AND FOR 

 DEEP-AND-WIDE SOCKET 



Diameter, in Inches 



Tests indicate that standard pipe as made can carry a 

 uniform load of about 2,000 Ib. per lin. ft. of pipe, and double- 

 strength pipe, about 4,000 Ib. The load that sewer pipes must 

 carry is the weight of the earth in the trench above them, with 

 the additional weight of a wagon wheel or a steam-roller wheel, 



