{"operation":"document","citation":"49 CFR 192.105","title":"Design formula for steel pipe.","source_type":"regulation","agency":"Pipeline and Hazardous Materials Safety Administration","status":"current","official":true,"published_on":null,"effective_on":"2026-08-18","summary":"(a) The design pressure for steel pipe is determined in accordance with the following formula:\n\nP = (2 St/D) × F × E × T\n\nP = Design pressure in pounds per square inch (kPa) gauge. S = Yield strength in pounds per square inch (kPa) determined in accordance with § 192.107. D = Nominal outside diamete","machine_formats":{"json":"https://regulus.evalyn.ai/document/49-cfr-192-105.json","markdown":"https://regulus.evalyn.ai/document/49-cfr-192-105.md"},"app_url":"https://regulus.evalyn.ai/document/49-cfr-192-105","source_url":"https://www.ecfr.gov/on/2026-08-18/title-49/section-192.105","body":"(a) The design pressure for steel pipe is determined in accordance with the following formula:\n\nP = (2 St/D) × F × E × T\n\nP = Design pressure in pounds per square inch (kPa) gauge. S = Yield strength in pounds per square inch (kPa) determined in accordance with § 192.107. D = Nominal outside diameter of the pipe in inches (millimeters). t = Nominal wall thickness of the pipe in inches (millimeters). If this is unknown, it is determined in accordance with § 192.109. Additional wall thickness required for concurrent external loads in accordance with § 192.103 may not be included in computing design pressure. F = Design factor determined in accordance with § 192.111. E = Longitudinal joint factor determined in accordance with § 192.113. T = Temperature derating factor determined in accordance with § 192.115.\n\n(b) If steel pipe that has been subjected to cold expansion to meet the SMYS is subsequently heated, other than by welding or stress relieving as a part of welding, the design pressure is limited to 75 percent of the pressure determined under paragraph (a) of this section if the temperature of the pipe exceeds 900 °F (482 °C) at any time or is held above 600 °F (316 °C) for more than 1 hour.\n\n[35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-47, 49 FR 7569, Mar. 1, 1984; Amdt. 192-85, 63 FR 37502, July 13, 1998]","truncated":false,"body_characters":1338}