---
kind: "section"
citation: "46 C.F.R. § 39.2003"
title: "46"
number: "39.2003"
heading: "Cargo gauging system—TB/ALL."
url: "https://uscodex.org/cfr/46/39.2003"
---

# §39.2003. Cargo gauging system—TB/ALL.

- (a) A cargo tank of the tank vessel connected to a vapor collection system must be equipped with a permanent or portable cargo gauging device that—
  - (1) Is a closed type as defined in [46 CFR 151.15.10(c)](/cfr/46/151.15.10.md?p=c) that does not require opening the tank to the atmosphere during cargo transfer;
  - (2) Allows the operator to determine the level of liquid in the tank for the full range of liquid levels in the tank;
  - (3) Has an indicator for the level of liquid in the tank that is located where cargo transfer is controlled; and
  - (4) If portable, is installed on the tank during the entire transfer operation.
- (b) Each cargo tank of a tank barge must have a high-level indicating device, unless the barge complies with [46 CFR 39.2009(a)](/cfr/46/39.2009.md?p=a). The high-level indicating device must—
  - (1) Indicate visually the level of liquid in the cargo tank when the liquid level is within a range of 1 meter (3.28 feet) of the top of the tank;
  - (2) Show a permanent mark to indicate the maximum liquid level permitted under [46 CFR 39.3001(e)](/cfr/46/39.3001.md?p=e) at even keel conditions; and
  - (3) **Be visible from all cargo control areas.**

## Notes

### Authority

Authority: 42 U.S.C. 7511b(f)(2); 46 U.S.C. 3306, 3703, 3715(b), 70011, 70034; Executive Order 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; DHS Delegation No. 00170.1, Revision No. 01.4.

### Source

Source: USCG-1999-5150, 78 FR 42642, July 16, 2013, unless otherwise noted.