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Pressure Rating Carbon Steel Butt Weld Fittings
Based On The Code For Pressure Piping B31.8
 

EXTRA STRONG
Nominal Wall Thickness 35,000 psi Yield Strength
Basic Design Factor
Pipe Size Outside Diameter
.40 .50 .60 .72
 
1/2 .840 .147 4900 6125 7350 8820
3/4 1.050 .154 4107 5133 6160 7392
1 1.315 .179 3811 4764 5717 6861
1 1/4 1.660 .191 3222 4027 4833 5799
1 1/2 1.900 .200 2947 3684 4421 5305
2 2.375 .218 2570 3213 3855 4626
2 1/2 2.875 .276 2688 3360 4032 4838
3 3.500 .300 2400 3000 3600 4320
3 1/2 4.000 .318 2226 2783 3339 4007
4 4.500 .337 2097 2621 3145 3774
5 5.563 .375 1888 2360 2831 3398
6 6.625 .432 1826 2282 2739 3286
8 8.625 .500 1623 2029 2435 2922
10 10.75 .500 1302 1628 1953 2344
12 12.75 .500 1098 1373 1647 1976
14 14.00 .500 1000 1250 1500 1800
16 16.00 .500 875 1094 1313 1575
18 18.00 .500 708 972 1167 1400
20 20.00 .500 700 875 1050 1260
24 24.00 .500 583 729 875 1050
30 30.00 .500 466 583 700 840
36 36.00 .500 389 486 583 700
42 42.00 .500 333 417 500 600
48 48.00 .500 292 365 437 525
< Standard
 
Weldbend Notes:
  1. A joint sufficiency factor of 1.00 is assumed.
  2. Ratings are for a temperature of 250oF or less.
  3. References should be made to the ASME B31.8 for consideration of other factors that could effect the determination of pressure ratings.
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