# -12 Gauging devices.

- **operation:** document
- **citation:** 49 CFR 178.345-12
- **title:** -12 Gauging devices.
- **source type:** regulation
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** current
- **official:** true
- **published on:** Not available
- **effective on:** 2026-08-18
- **summary:** Each cargo tank, except a cargo tank intended to be filled by weight, must be equipped with a gauging device that indicates the maximum permitted liquid level to within 0.5 percent of the nominal capacity as measured by volume or liquid level. Gauge glasses are not permitted.

[Amdt. 178-89, 55 FR 3
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- **markdown:** https://regulus.evalyn.ai/document/49-cfr-178-345-12.md
- **app url:** https://regulus.evalyn.ai/document/49-cfr-178-345-12
- **source url:** https://www.ecfr.gov/on/2026-08-18/title-49/section-178.345-12
**body:**

Each cargo tank, except a cargo tank intended to be filled by weight, must be equipped with a gauging device that indicates the maximum permitted liquid level to within 0.5 percent of the nominal capacity as measured by volume or liquid level. Gauge glasses are not permitted.

[Amdt. 178-89, 55 FR 37062, Sept. 7, 1990, as amended by Amdt. 178-118, 61 FR 51342, Oct. 1, 1996]
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