C110/A21.10-03: American National Standard for Ductile-Iron and Gray-Iron Fittings for Water (PDF)
SKU: STC_0059101-PDF
This standard describes 3- to 48-in. (76- to 1,219-mm) gray-iron or ductile-iron fittings to be used with ductile-iron pipe for water. Requirements for fittings with mechanical joints and flanged joints are listed in Tables 1 through 19 at the end of this standard. This standard may also be used for fittings with push-on joints or such other joints as may be agreed on at the time of purchase. For the 3- to 24-in. (76- to 610-mm) size range, ductile-iron mechanical-joint fittings and ductile-iron push-on-joint fittings are rated for 350 psi (2,413 kPa) working pressure. Ductile-iron flange-joint fittings are rated for 250-psi (1,724-kPa) working pressure; however, 24-in. (610 mm) and smaller sizes may be rated for 350 psi (2,413 kPa) with the use of special gaskets. Gray-iron fittings having all types of joints described in this standard are rated for 150- or 250-psi (1,034- or 1,724-kPa) working pressures, as shown in the tables. For the 30- to 48-in. (762- to 1,219-mm) size range, fittings with all types of joints described in this standard are shown in the tables with rated working pressures of 150 or 250 psi (1,034 or 1,724 kPa), depending on the type of iron as shown in the tables. Fittings are adequate for the rated working pressure plus a surge allowance of 775 g (100 psi) or a surge allowance of half the rated working pressure, whichever is less.
Description
The major revisions made to this standard in this edition are as follows: Sec. I.A, Background, was revised to recognize the current scope of the A21 Committee; the scope was amended and Tables 12 and 15 through 19 were footnoted to recognize that 24-in. (610 mm) and smaller flanged fittings may be rated for 350 psi with the use of specially designed gaskets, either ring or full face using annular rings molded into the gasket to improve performance, as recommended by the manufacturer; the scope was revised to include a surge allowance; Sec. 4.2.1 was revised to reference ANSI/AWWA C111/A21.11 for the details of mechanical joint bell, plain end and accessories, the figure and table providing details of the mechanical joint were deleted; and, Sec. 4.3 was revised to include fusion-bonded epoxy coating systems as a manufacturer's option.