---
kind: "section"
citation: "46 C.F.R. § 153.406"
title: "46"
number: "153.406"
heading: "Standards for containment systems having required restricted gauges."
url: "https://uscodex.org/cfr/46/153.406"
---

# §153.406. Standards for containment systems having required restricted gauges.


When Table 1 requires a cargo's containment system to have a restricted gauge, the containment system must have:

- (a) A closed gauging system; or
- (b) **A system that has—**
  - (1) A restricted gauge (e.g., a sounding tube) with an orifice diameter not exceeding 20 cm (approx. 7.8 in.);
  - (2) A permanently attached gauge cover that is vapor tight when in place; and
  - (3) **A venting system that has either—**
    - (i) Lock open PV valves; or
    - (ii) **Valved bypasses around the PV valves.**

## Notes

### Authority

Authority: 46 U.S.C. 3703; Department of Homeland Security Delegation No. 0170.1. Section 153.40 issued under 49 U.S.C. 5103. Sections 153.470 through 153.491, 153.1100 through 153.1132, and 153.1600 through 153.1608 also issued under 33 U.S.C. 1903 (b).

### Source

Source: CGD 73-96, 42 FR 49027, Sept. 26, 1977, unless otherwise noted.