{"data":{"id":"us/49-cfr-192.105","jurisdiction":"us","citation":"49 CFR 192.105","heading":"Design formula for steel pipe.","body":"(a) The design pressure for steel pipe is determined in accordance with the following formula:\nP = (2 St/D) × F × E × T\nP = Design pressure in pounds per square inch (kPa) gauge.\nS = Yield strength in pounds per square inch (kPa) determined in accordance with § 192.107.\nD = Nominal outside diameter of the pipe in inches (millimeters).\nt = 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.\nF = Design factor determined in accordance with § 192.111.\nE = Longitudinal joint factor determined in accordance with § 192.113.\nT = Temperature derating factor determined in accordance with § 192.115.\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.","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER I—PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER D—PIPELINE SAFETY","PART 192—TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS","Subpart C—Pipe Design"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"bafbba96b07cd272d345a24d0245cf17b1fa8693af96e65f0b418d314a988648","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-192.103","next":"us/49-cfr-192.107"},"notice":"GroundRules: Original legal text. Not legal advice."}