Pressure-Temperature Ratings of Soldered and Brazed Joints

Joining material4 Service temperature °F Fitting type Maximum working gage pressure (psi), for standard water tube sizes1
Nominal or standard size, inches
1/8 - 1 1 1/4 - 2 2 1/4 - 4 5 - 8 10 - 12
Alloy Sn50
50-50
Tin-Lead
Solder5 		100 Pressure2 200 175 150 135 100
DWV3 – 95 80 70 –
150 Pressure2 150 125 100 90 70
DWV3 – 70 55 45 –
200 Pressure2 100 90 75 70 50
DWV3 – 50 40 35 –
250 Pressure2 85 75 50 45 40
DWV3 – – – – –
Saturated
steam		 Pressure 15 15 15 15 15
Alloy Sb5
95-5
Tin-Antimony
Solder 		100 Pressure2 1090 850 705 660 500
DWV3 – 390 325 330 –
150 Pressure2 625 485 405 375 285
DWV3 – 225 185 190 –
200 Pressure2 505 395 325 305 230
DWV3 – 180 150 155 –
250 Pressure2 270 210 175 165 125
DWV3 – 95 80 80 –
Saturated
steam		 Pressure 15 15 15 15 15
Alloy E 100 Pressure2 710 555 460 430 325
DWV3 – 255 210 215 –
150 Pressure2 475 370 305 285 215
DWV3 – 170 140 140 –
200 Pressure2 375 290 240 225 170
DWV3 – 135 110 115 –
250 Pressure2 320 250 205 195 145
DWV3 – 115 95 95 –
Saturated
steam		 Pressure 15 15 15 15 15
Alloy HB 100 Pressure2 1035 805 670 625 475
DWV3 – 370 310 315 –
150 Pressure2 710 555 460 430 325
DWV3 – 255 210 215 –
200 Pressure2 440 345 285 265 200
DWV3 – 155 130 135 –
250 Pressure2 430 335 275 260 195
DWV3 – 155 125 130 –
Saturated
steam		 Pressure 15 15 15 15 15
Joining materials melting at or above 1100° F6 Pressure-temperature ratings consistent with the materials and procedures employed
(see Table 3, annealed)
Saturated steam Pressure 120 120 120 120 120
For extremely low working temperatures in the 0°F to minus 200°F range, it is recommended that a joint material melting at or above 1100°F be employed (see reference 6 below).

1 Standard water tube sizes per ASTM B 88.
2 Ratings up to 8 inches in size are those given in ASME B16.22 Wrought Copper and Copper Alloy Solder Joint Pressure Fittings and ASME B16.18 Cast Copper and Copper Alloy Solder Joint Fittings. Rating for 10- to 12-inch sizes are those given in ASME B16.18 Cast Copper and Copper Alloy Solder Joint Pressure Fittings.
3 Using ASME B16.29 Wrought Copper and Wrought Copper Alloy Solder Joint Drainage Fittings – DWV, and ASME B16.23 Cast Copper Alloy Solder Joint Drainage Fittings – DWV.
4 Alloy designations are per ASTM B 32.
5 The Safe Drinking Water Act Amendment of 1986 prohibits the use in potable water systems of any solder having a lead content in excess of 0.2%.
6 These joining materials are defined as brazing alloys by the American Welding Society.