Ductile and Cast-Iron Fittings of Piping Fundamentals

Let us entering the Ductile and Cast Iron Fittings which covered by number of ASME standards, only on Piping & Fabrication.

Ductile and Cast-Iron Fittings
Cast-iron fittings are covered by a number of ASME and ANSI/AWWA standards:
ASME B16.1
Cast Iron Pipe Flanges and Flanged Fittings, Class 25, 125, 250, and 800 (The standard also includes bolt, nut, and gasket data.)

ASME B16.
4 Gray Iron Threaded Fittings, Class 125 and 250
ASME B16.12
Cast Iron Threaded Drainage Fittings
ANSI/AWWA C110/A21.10
Ductile Iron and Gray Iron Fittings, 3-in through 48-in (76 mm through 6200 mm), for Water and Other Liquids
ANSI/AWWA C115/A21.15
Ductile Iron and Gray Iron Fittings, 3-in through 48-in (76 mm through 1200 mm), for Water
ANSI/AWWA C153/A21.53
Ductile Iron Compact Fittings, 3-in through 24-in (76 mm through 610 mm) and 54-in through 64-in (1400 mm through 1600 mm), for Water Service

Cast-Iron Threaded Fittings
Cast-iron threaded fittings are covered by ASME Standard B16.4. The standard specifies the below-listed attributes for Class 125 and Class 250 tees, crosses, 45_and 90_ elbows, reducing tees, caps, couplings, and reducing couplings in sizes ranging from NPS 1⁄₄ (DN 6) through NPS 12 (DN 300), inclusive. However, in Class 250, the standard only covers 45_ and 90_ elbows, straight tees, and straight crosses.

• Pressure-temperature ratings
• Size and method of designating openings of reducing fittings
• Marking
• Minimum requirements for materials
• Dimensions and tolerances
• Threading
• Coatings

TABLE A2.2 Pressure-Temperature Rating of ANSI/ASME B16.4 Cast-Iron Fittings

The pressure-temperature ratings of Class 125 and Class 250 are listed in Table A2.2. The ratings are independent of the contained fluid and are the maximum non shock pressure at the listed temperature. As a minimum, the material must conform to class A of ASTM A126. The fittings are threaded with ASME B1.20.1 pipe threads.