Soldered Joint Fittings and Cast Iron Flanged Fittings

Soldered-Joint Fittings

TABLE A2.5 Pressure Ratings for Solder Joints (ASME B16.18-1984). Maximum Working Pressure (psi).

Soldered-joint wrought metal and cast-brass or -bronze fittings for use with copper water tubes are covered by ASTM B88 and H23.1. The fittings are made in accordance with ASME B16.22 and B16.18, respectively. Joints using these types of fittings and made with 50–50 tin-lead solder, 95-tin 5-antimony solder, or solder melting above 1100_F (593_C) have the pressure-temperature ratings shown in Table
A2.5. (Note: Lead-bearing solder is not permitted for potable water service.) Wrought copper fittings normally have a minimum copper content of 83 percent. Cast-brass fittings conform to ASTM B62 and have a nominal composition of 85 percent copper, 5 percent tin, 5 percent lead, and 5 percent zinc. The minimum requirements for 50–50 tin-lead solder generally used with these fittings are covered in ASTM B32 alloy grade 50A. Metal thickness tolerances and general dimensions of fittings are given in ASME B16.18.

Cast-Iron Flanged Fittings

Cast-iron flanged fittings are produced in accordance with ASME B16.1.

The standard specifies pressure-temperature ratings, sizes, marking, minimum requirements for materials, dimensions and tolerances, bolting, gasketing, and testing requirements. The fittings are manufactured in a variety of configurations (tees, elbows, crosses, laterals, etc.) in pressure Classes 25, 125, 250, and 800. Not all sizes and styles are available in all ratings. The sizes available in each class are listed below:

The non shock pressure-temperature ratings for the four pressure classes are listed in Table A2.6. The materials of construction are ASTM A 126 class A or B, as shown in Table A2.6.

Let us take a break for a while after we talk about Soldered Joint Fittings and Cast Iron Flanged Fittings, mean while Piping & Fabrication will think of what should post in the next posting.