# 255.105 Design formula for steel pipe. **Citation:** 16 NYCRR 255.105 **Type / status:** regulation / current **Agency:** New York State Public Service Commission **Effective:** Not stated **Published:** Not stated Transmission and Distribution of Gas. (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 section 255.107 of this Part. D = Nominal outside diameter of the pipe in inches (millimeters). ## Document text (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 section 255.107 of this Part. 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 section 255.109 of this Part. Additional wall thickness required for concurrent external loads in accordance with section 255.103 of this Part may not be included in computing design pressure. F = Design factor determined in accordance with section 255.111 of this Part. E = Longitudinal joint factor determined in accordance with section 255.113 of this Part. T = Temperature derating factor determined in accordance with section 255.115 of this Part. (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 subdivision (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 one hour. ## Provenance - Official: Yes - Source: - Source ID: `ny-dps-nycrr` - SHA-256: `2d97edbffc3947bbf96c8625a7206bab62ee6ae969794a86fed445044c20bcba` - Retrieved: 2026-08-12T06:20:40.894Z - Exported: 2026-08-24T14:42:35.038Z - Document slug: `ny-nycrr-255-105` ### Source metadata ```json { "jurisdiction": "US-NY", "title": 16, "part": "255", "partTitle": "Transmission and Distribution of Gas", "scopeKind": "gas-pipeline-safety", "tocPath": [ "Part 255 Transmission and Distribution of Gas", "Pipe Design" ], "legalScope": "Complete current terminal legal unit exposed by the DPS-designated Title 16 NYCRR pipeline-safety part inventory.", "applicabilityCaveat": "Applicability depends on the part and section, Commission jurisdiction, commodity and facility type, intrastate or interstate status, operator and activity, exemptions, waivers, federal preemption, Commission orders, and incorporated law. DPS inspects portions of interstate systems for PHMSA, but PHMSA retains federal enforcement authority. DPS states that all jurisdictional Part 256 gas-holder and Part 257 LPG-plant facilities have been decommissioned even though those regulations remain unrepealed.", "incorporationCaveat": "These parts incorporate or rely on federal pipeline regulations, federal and New York statutes, Commission rules and orders, and privately authored technical standards. Part 10 supplies incorporation details. References metadata preserves explicit citations but does not reproduce external material, determine licensing rights, or decide whether a particular incorporation is static or dynamic.", "publicationCaveat": "The New York Department of Public Service identifies these eleven Title 16 NYCRR parts as its state pipeline-safety regulations and links to the public DOS/Westlaw NYCRR reading copy. That site labels the online text unofficial and directs users needing evidentiary accuracy to the Official NYCRR maintained by the Department of State Division of Administrative Rules. Each section's 'Current through' date is the most recent official NYCRR supplement covering that section, not a uniform corpus-wide amendment date.", "rights": "New York government-edict text is preserved with DPS, Department of State, and publisher attribution. The public reading site's presentation and enhancements, agency marks, forms, annotations, and incorporated federal or privately authored standards require separate rights review; this connector does not claim rights in those materials.", "rightsReviewRequired": true, "currentThrough": "2024-05-31", "historyEvents": "No event is emitted because the section reading copy does not supply an explicit adoption, filing, or effective-date history.", "publisherCitation": "16 CRR-NY 255.105", "identityAnomaly": null, "references": [ { "citation": "16 NYCRR 255.107", "referenceType": "new-york-administrative-code", "url": "https://govt.westlaw.com/nycrr/Document/I505c6fdacd1711dda432a117e6e0f345?viewType=FullText&originationContext=documenttoc&transitionType=CategoryPageItem&contextData=(sc.Default)" }, { "citation": "16 NYCRR 255.109", "referenceType": "new-york-administrative-code", "url": "https://govt.westlaw.com/nycrr/Document/I505c6fddcd1711dda432a117e6e0f345?viewType=FullText&originationContext=documenttoc&transitionType=CategoryPageItem&contextData=(sc.Default)" }, { "citation": "16 NYCRR 255.103", "referenceType": "new-york-administrative-code", "url": "https://govt.westlaw.com/nycrr/Document/I505c6fd4cd1711dda432a117e6e0f345?viewType=FullText&originationContext=documenttoc&transitionType=CategoryPageItem&contextData=(sc.Default)" }, { "citation": "16 NYCRR 255.111", "referenceType": "new-york-administrative-code", "url": "https://govt.westlaw.com/nycrr/Document/I505c6fe0cd1711dda432a117e6e0f345?viewType=FullText&originationContext=documenttoc&transitionType=CategoryPageItem&contextData=(sc.Default)" }, { "citation": "16 NYCRR 255.113", "referenceType": "new-york-administrative-code", "url": "https://govt.westlaw.com/nycrr/Document/I505c6fe3cd1711dda432a117e6e0f345?viewType=FullText&originationContext=documenttoc&transitionType=CategoryPageItem&contextData=(sc.Default)" }, { "citation": "16 NYCRR 255.115", "referenceType": "new-york-administrative-code", "url": "https://govt.westlaw.com/nycrr/Document/I505c6fe6cd1711dda432a117e6e0f345?viewType=FullText&originationContext=documenttoc&transitionType=CategoryPageItem&contextData=(sc.Default)" } ], "region": "NY" } ```