This standard describes the thickness design of ductile-iron pipe complying with
the requirements of ANSI/AWWA C151/A21.51, Ductile-Iron Pipe, Centrifugally
Cast, for Water. Section 4.1 outlines the design procedure, and Sec. 4.2 gives a design
example. Section 4.3 explains the basis of design. As...
Back to C150/A21.50-02: American National Standard for Thickness Design of Ductile-Iron Pipe
This standard describes the thickness design of ductile-iron pipe complying with
the requirements of ANSI/AWWA C151/A21.51, Ductile-Iron Pipe, Centrifugally
Cast, for Water. Section 4.1 outlines the design procedure, and Sec. 4.2 gives a design
example. Section 4.3 explains the basis of design. As opposed to using procedures in
Sec. 4.1 or Sec. 4.3, the designer may reference Tables 12 through 14 directly.
Table 12 lists thicknesses for standard laying conditions and certain depths of
cover. Table 13 lists thicknesses for 150 psi-350 psi (1,034 kPa-2,413 kPa) water
working pressure.
The greater thickness from Table 12 or Table 13 for given trench load or internal
pressure should be used.
Table 14 lists working pressures and maximum depths of cover for standard
laying conditions and standard pressure classes. Table 15 lists special thickness
classes of ductile-iron pipe. Major revisions made to the standard in this edition
include the following:
the acceptance clause (Sec. I.C) has been revised to approved wording;
updated to AWWA standard style;
the design procedures in Section 4 were placed in different order to, first - design for internal pressure, second - design for bending stress, and third - check for
deflection (the results of the design did not change); and,
a definition was added for granular material used in bedding and backfill.