# Design formula for steel pipe.

- **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:** Not available
- **effective on:** 2026-08-18
- **summary:** (a) The design pressure for steel pipe is determined in accordance with the following formula:

P = (2 St/D) × F × E × T

P = 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
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- **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:

P = (2 St/D) × F × E × T

P = 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.

(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.

[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]
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