{"operation":"document","citation":"HAR 6-77-29","title":"HAR 6-77-29 Design formula for steel pipe","source_type":"regulation","agency":"Hawaii Public Utilities Commission","status":"current","official":true,"published_on":"1994-04-15","effective_on":"1994-09-03","summary":"determined in accordance with the following formula: P=(2 St/D) x F x E x T P = Design pressure in pounds per square inch gauge. S = Yield strength in pounds per square inch determined in accordance with section 6- 77-30. D = Nominal outside diameter of the pipe in inches. t = Nominal wall thickness","machine_formats":{"json":"https://regulus.evalyn.ai/document/hi-har-har-6-77-29.json","markdown":"https://regulus.evalyn.ai/document/hi-har-har-6-77-29.md"},"app_url":"https://regulus.evalyn.ai/document/hi-har-har-6-77-29","source_url":"https://puc.hawaii.gov/wp-content/uploads/2026/04/HAR-6-77-Transp-of-Gas-03-31-2026.pdf","body":"determined in accordance with the following formula: P=(2 St/D) x F x E x T P = Design pressure in pounds per square inch gauge. S = Yield strength in pounds per square inch determined in accordance with section 6- 77-30. D = Nominal outside diameter of the pipe in inches. t = Nominal wall thickness of the pipe in inches. If this is unknown, it is determined in accordance with section 6-77-31. Additional wall thickness required for concurrent external loads in accordance with section 6-77-28 may not be included in computing design pressure. F = Design factor determined in accordance with section 6-77-32. E = Longitudinal joint factor determined in accordance with section 6-77-33. T = Temperature derating factor determined in accordance with section 6-77-34. (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 seventy-five percent of the pressure determined under subsection (a) if the temperature of the pipe exceeds 900E F (482E C) at any time or is held above 600E F (316E C) for more than one hour. [Eff ] (Auth: HRS '269 -6) (Imp: 49 C.F.R. '192.105, October 1, 1990)","truncated":false,"body_characters":1229}