The table below indicates maximum working pressure of carbon steel pipes manufactured according ASME/ANSI B 36.10 and ASTM A53 B: Carbon Steel Pipes - Working Pressure Nominal Size (inches) Pipe Outside Diameter OD (inches) Schedule Number or weight Wall Thickness - t - (inches) Inside Diameter - d - (inches) Working Pressure ASTM A53 B to 400F Manu- facturing Process Joint Type psig 1/40.540 40ST0.0880.364CW1)T188 80XS0.1190.302CWT871 3/80.675 40ST0.0910.493CWT203 80XS0.1260.423CWT820 1/20.840 40ST0.1090.622CWT214 80XS0.1470.546CWT753 3/41.050 40ST0.1130.824CWT217 80XS0.1540.742CWT681 11.315 40ST0.1331.049CWT226 80XS0.1790.957CWT642 1 1/41.660 40ST0.1401.380CWT229 80XS0.1911.278CWT594 1 1/21.900 40ST0.1451.610CWT231 80XS0.2001.500CWT576 22.375 40ST0.1542.067CWT230 80XS0.2181.939CWT551 2 1/22.875 40ST0.2032.469CWW533 80XS0.2762.323CWW835 33.500 40ST0.2163.068CWW482 80XS0.3002.900CWW767 44.500 40ST0.2374.026CWW430 80XS0.3373.826CWW695 66.625 40ST0.2806.065ERW2)W696 80XS0.4325.761ERWW1209 88.625 300.2778.071ERWW526 40ST0.3227.981ERWW643 80XS0.5007.625ERWW1106 1010.75 300.30710.136ERWW485 40ST0.36510.020ERWW606 XS0.5009.750ERWW887 800.5939.564ERWW1081 1212.75 300.33012.090ERWW449 ST0.37512.000ERWW528 400.40611.938ERWW583 XS0.50011.750ERWW748 800.68711.376ERWW1076 1414.00 30ST0.37513.250ERWW481 400.43713.126ERWW580 XS0.50013.000ERWW681 800.75012.500ERWW1081 1616.00 30ST0.37515.250ERWW421 40XS0.50015.000ERWW596 1818.00 ST0.37517.250ERWW374 300.43717.126ERWW451 XS0.50017.000ERWW530 400.56216.876ERWW607 2020.00 20ST0.37519.250ERWW337 30XS0.50019.000ERWW477 400.59318.814ERWW581 1) CW - continuous weld - a method of producing small diameter pipe (1/2-4") 2) ERW - electric resistance weld - most common form of manufacture for pipe in sizes from 2 3/8-22" OD 1 in (inch) = 25.4 mm1 psi (lb/in2) = 6,894.8 Pa (N/m2) = 6.895x10-2 bar