Sewerage and Sewage Treatment

by Harold E. Babbitt

(31) The glaze shall consist of a continuous layer of bright or semi-bright glass substantially free from coarse blisters and pimples.... Not more than 10 per cent of the inner surface of any pipe barrel shall be bare of glaze except the hub, where it may be entirely absent. Glazing will not be required on the outer surface of the barrel at the spigot end for a distance from the end equal to ⅔ the specified depth of the socket for the corresponding size of pipe. Where glazing is required there shall be absence of any well defined network of crazing lines or hair cracks.

(32) The ends of the pipe shall be square with their longitudinal axis.

(33) Special shapes shall have a plain spigot end and a hub end corresponding in all respects with the dimensions specified for pipes of the corresponding internal diameter.

TABLE 36
Properties of Clay Sewer Pipe
Abstracts from Tentative Specifications of the American Society for Testing Materials
Internal Diameter, Inches	Minimum Crushing Strength, Pounds per Linear Foot. See Note 2	Maximum Absorption, Per Cent	Laying length, Feet	Diameter of Inside of Socket, Inches	Depth of Socket Inches	Taper of Socket	Minimum Thickness of Barrel. Inches	Permissible Variations						Number of Scorings on Spigot and Socket ⅛ Inch Deep
								Length, Inches (-), per Foot	Internal Diameter, Inches		Length of Two Opposite Sides, Inches	Depth of Socket, Inches (-)	Thickness of Barrel, Inches (-)
									Spigot (±)	Socket (±)
6	1430	5	2, 2½, 3	8¼	2	1 : 20	⅝	¼	3 16	¼	⅛	¼	1 16	2
8	1430	5	2, 2½, 3	10¾	2¼	1 : 20	¾	¼	¼	5 16	⅛	¼	1 16	2
10	1570	5	2, 2½, 3	13	2½	1 : 20	⅞	¼	¼	5 16	⅛	¼	1 16	2
12	1710	5	2, 2½, 3	15¼	2½	1 : 20	1	¼	5 16	⅜	⅛	¼	1 16	2
15	1960	5	2, 2½, 3	18¾	2½	1 : 20	1¼	¼	5 16	⅜	⅛	¼	3 32	3
18	2200	5	2, 2½, 3	22¼	3	1 : 20	1½	¼	⅜	7 16	3 16	¼	3 32	3
21	2590	5	2, 2½, 3	26	3	1 : 20	1¾	¼	7 16	½	3 16	¼	⅛	3
24	3070	5	2, 2½, 3	29½	3	1 : 20	2	⅜	½	9 16	¼	¼	⅛	4
27	3370	5	3	33¼	3½	1 : 20	2¼	⅜	⅝	11 16	¼	¼	⅛	4
30	3690	5	3	37	3½	1 : 20	2½	⅜	⅝	11 16	¼	¼	⅛	4
33	3930	5	3	40¼	4	1 : 20	2⅝	⅜	¾	13 16	¼	¼	3 16	5
36	4400	5	3	44	4	1 : 20	2¾	⅜	¾	13 16	⅜	¼	3 16	5
39	4710	5	3	47¼	4	1 : 20	2⅞	⅜	¾	13 16	⅜	¼	3 16	5
42	5030	5	3	51	4	1 : 20	3	⅜	¾	13 16	⅜	¼	3 16	5

Note 1. For methods of making tests see Proc. Am. Soc. for Testing Materials.

Note 2. Concentrated load at end of vertical diameter.

(a) Slants shall have their spigot ends cut at an angle of approximately 45 degrees with the longitudinal axis.

(b) Curves shall be at angles of 90, 45, 22½, and 11¼ degrees as required. They shall conform substantially to the curvature specified.

(c) ... All branches shall terminate in sockets.