49 CFR § 192.706 - Transmission lines: Leakage surveys.
---
identifier: "/us/cfr/t49/s192.706"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 192.706 - Transmission lines: Leakage surveys."
title_number: 49
title_name: "Transportation"
section_number: "192.706"
section_name: "Transmission lines: Leakage surveys."
chapter_name: "PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "D"
subchapter_name: "PIPELINE SAFETY"
part_number: "192"
part_name: "TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "30 U.S.C. 185(w)(3), 49 U.S.C. 5103, 60101 and 49 CFR 1.97."
regulatory_source: "35 FR 13257, Aug. 19, 1970, unless otherwise noted."
cfr_part: "192"
---
# 192.706 Transmission lines: Leakage surveys.
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]