# Transmission lines: Leakage surveys.

**Citation:** 49 CFR 192.706  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

Leakage surveys of a transmission line must be conducted at intervals not exceeding 15 months, but at least once each calendar year. However, in the case of a transmission line which transports gas in conformity with § 192.625 without an odor or odorant, leakage surveys using leak detector equipment

## Document text

Leakage surveys of a transmission line must be conducted at intervals not exceeding 15 months, but at least once each calendar year. However, in the case of a transmission line which transports gas in conformity with § 192.625 without an odor or odorant, leakage surveys using leak detector equipment must be conducted—

(a) In Class 3 locations, at intervals not exceeding 7 1/2 months, but at least twice each calendar year; and

(b) In Class 4 locations, at intervals not exceeding 4 1/2 months, but at least four times each calendar year.

[Amdt. 192-21, 40 FR 20283, May 9, 1975, as amended by Amdt. 192-43, 47 FR 46851, Oct. 21, 1982; Amdt. 192-71, 59 FR 6585, Feb. 11, 1994]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-192.706>
- Source ID: `ecfr`
- SHA-256: `40184d35c9fc6fab5c9133ec4037c7b5a5aee3e31c674b9a86988d45150cf2bc`
- Retrieved: 2026-08-20T05:54:34.435Z
- Exported: 2026-08-22T19:52:09.733Z
- Document slug: `49-cfr-192-706`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "192",
  "section": "192.706",
  "subpart": "Subpart M—Maintenance",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```