This standard describes 3-in. through 64-in. flanged ductile-iron pipe with
ductile-iron or gray-iron threaded flanges for water supply service. Flanged pipe
and flanges are rated for a maximum working pressure of 250 psi (1,720 kPa).
However, 12-in. and smaller flanged joints with ductile-iron...
Back to C115/A21.15-99: American National Standard for Flanged Ductile-Iron Pipe with Ductile-Iron or Gray-Iron Threaded Flanges
This standard describes 3-in. through 64-in. flanged ductile-iron pipe with
ductile-iron or gray-iron threaded flanges for water supply service. Flanged pipe
and flanges are rated for a maximum working pressure of 250 psi (1,720 kPa).
However, 12-in. and smaller flanged joints with ductile-iron flanges may be rated
for a maximum working pressure of 350 psi (2,413 kPa). Appendices A, B, and C
cover bolts, gaskets, installation, typical pipe/flange thread construction, and
wall pipe. Major revisions in this edition of ANSI/AWWA C115/A21.15-99 include
the following: in Sec. 1.1, Scope and in the footnote of Table 1, the capability
of 12 in. and smaller flanges to be rated for 350 psi has been added; in the
footnote to Tables 2 and 3, a statement on the serviceability of recessed bolt
ends has been addressed; Sec. A.1, Bolts and Nuts, has been revised to correct a
conflict concerning the use of standard and heavy hex bolts and nuts and bolt
grades. Cautionary wording concerning the use of these with gray-iron flanges has
been added; and, Appendix C, Wall Pipe, is new.