# 255.756 Replacement of exposed or undermined cast iron piping.

**Citation:** 16 NYCRR 255.756  
**Type / status:** regulation / current  
**Agency:** New York State Public Service Commission  
**Effective:** Not stated  
**Published:** Not stated

Transmission and Distribution of Gas. (a) When any cast iron pipe, eight inches or less in nominal diameter, has been or will be exposed and undermined by an excavation 36 inches (914 millimeters) or greater in width, the purpose of which is for work other than normal gas operation and maintenance work being performed on the exposed cast iron main, one of the following actions must be taken in t

## Document text

(a) When any cast iron pipe, eight inches or less in nominal diameter, has been or will be exposed and undermined by an excavation 36 inches (914 millimeters) or greater in width, the purpose of which is for work other than normal gas operation and maintenance work being performed on the exposed cast iron main, one of the following actions must be taken in the listed order of preference:

(1) the cast iron main is to be replaced prior to the third-party construction activity occurring; or

(2) the cast iron main is to be surveilled for leakage daily until the contractor allows access to the excavation area for replacement. After access is allowed, the operator is to immediately replace the affected cast iron main or maintain daily surveillance with an open vent hole and replace the cast iron main as soon as practical.

(b) For right angle crossings of cast iron mains, the length replaced shall be equal to at least the width of the excavation plus twice the distance from the top of the main to the bottom of the trench.

(c) For crossings of cast iron mains at other than right angles, the length of the replacement shall be increased so that all cast iron pipe will be removed from within the trench settlement area under the gas main, assuming an angle of repose of 45 degrees from the bottom of the trench.

(d) Where replacement of cast iron main is required it shall extend approximately equally on both sides of said excavations.

## Provenance

- Official: Yes
- Source: <https://govt.westlaw.com/nycrr/Document/I505d8168cd1711dda432a117e6e0f345?viewType=FullText&originationContext=documenttoc&transitionType=CategoryPageItem&contextData=(sc.Default)>
- Source ID: `ny-dps-nycrr`
- SHA-256: `b3d395768d14eda1df0889d5281ff9680ba2cc6d46ebc6925cc71c2adaabf813`
- Retrieved: 2026-08-12T06:20:40.894Z
- Exported: 2026-08-22T05:07:05.538Z
- Document slug: `ny-nycrr-255-756`

### 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",
    "Maintenance"
  ],
  "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 255.756",
  "identityAnomaly": null,
  "references": [],
  "region": "NY"
}
```