# 255.309 Repair of steel pipe. **Citation:** 16 NYCRR 255.309 **Type / status:** regulation / current **Agency:** New York State Public Service Commission **Effective:** Not stated **Published:** Not stated Transmission and Distribution of Gas. (a) Each imperfection or damage that impairs the serviceability of the length of steel pipe must be repaired or removed. (b) If a repair is made by grinding, the remaining wall thickness must at least be equal to either: (1) the minimum thickness required by the tolerances in the specification to which the pipe was manufactured; or (2) the nominal wall th ## Document text (a) Each imperfection or damage that impairs the serviceability of the length of steel pipe must be repaired or removed. (b) If a repair is made by grinding, the remaining wall thickness must at least be equal to either: (1) the minimum thickness required by the tolerances in the specification to which the pipe was manufactured; or (2) the nominal wall thickness required for the design pressure of the pipeline. (c) Each of the following dents must be removed from steel pipe to be operated at a pressure of 125 psig (862 kPa) or more, unless the dent is repaired by a method that reliable engineering tests and analyses show can permanently restore the serviceability of the pipe: (1) a dent that contains a stress concentrator such as a scratch, gouge, groove or arc burn; (2) a dent that affects a longitudinal weld or a circumferential weld; (3) a dent that has a depth of more than one-quarter inch in pipe 12¾ inches (324 millimeters) or less in outer diameter; or (4) a dent that has a depth of more than two percent of the nominal pipe diameter in pipe over 12¾ inches (324 millimeters) in outer diameter. (d) For the purpose of this section, a dent is a depression that produces a gross disturbance in the curvature of the pipe wall without reducing the pipewall thickness. The depth of a dent is measured as the gap between the lowest point of the dent and a prolongation of the original contour of the pipe. (e) Each arc burn on steel pipe to be operated at a pressure of 125 psig (862 kPa) or more must be repaired or removed. If a repair is made by grinding, the arc burn must be completely removed. (f) Complete removal of the metallurgical notch created by an arc burn can be determined by grinding away the visible evidence of the arc burn and then swabbing the ground area with a 20 percent solution of ammonium persulfate. A blackened spot is evidence of a metallurgical notch and indicates that additional grinding is necessary. (g) A gouge, groove, arc burn or dent may not be repaired by insert patching or by pounding out. (h) Each gouge, groove, arc burn or dent that is removed from a length of pipe must be removed by cutting out the damaged portion as a cylinder. (i) Notches or laminations on pipe ends shall not be repaired on pipe to be operated at a pressure of 125 psig (862 kPa) or more. The damaged portion shall be removed as a cylinder and the pipe end rebeveled. ## Provenance - Official: Yes - Source: - Source ID: `ny-dps-nycrr` - SHA-256: `c61b11cdab848c4c58cea1057386c308db8ad5ea31cf3c9ade48a91550480e21` - Retrieved: 2026-08-12T06:20:40.894Z - Exported: 2026-08-22T05:06:58.092Z - Document slug: `ny-nycrr-255-309` ### 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", "General Construction Requirements for Transmission Lines and Mains" ], "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 255.309", "identityAnomaly": null, "references": [], "region": "NY" } ```