---
kind: "section"
citation: "46 C.F.R. § 39.2007"
title: "46"
number: "39.2007"
heading: "Tankship liquid overfill protection—T/ALL."
url: "https://uscodex.org/cfr/46/39.2007"
---

# §39.2007. Tankship liquid overfill protection—T/ALL.

- (a) Each cargo tank of a tankship must be equipped with an intrinsically safe high-level alarm and a tank overfill alarm.
- (b) If installed after July 23, 1990, the high-level alarm and tank overfill alarm required by [paragraph (a)](#a) of this section must—
  - (1) Be independent of each other;
  - (2) Activate an alarm in the event of loss of power to the alarm system;
  - (3) Activate an alarm during the failure of electrical circuitry to the tank level sensor; and
  - (4) **Be able to be verified at the tank for proper operation prior to each transfer.** This procedure may be achieved with the use of an electronic self-testing feature that monitors the condition of the alarm circuitry and sensor.
- (c) **The high-level alarm required by paragraph (a) of this section must—**
  - (1) Activate an alarm once the cargo level reaches 95 percent of the tank capacity or higher, but before the tank overfill alarm;
  - (2) Be identified with the legend “High-level Alarm” in black letters at least 50.8 millimeters (2 inches) high on a white background; and
  - (3) Activate a visible and audible alarm so that it can be seen and heard on the vessel where cargo transfer is controlled.
- (d) **The tank overfill alarm required by paragraph (a) of this section must—**
  - (1) Be independent of the cargo gauging system;
  - (2) Be identified with the legend “TANK OVERFILL ALARM” in black letters at least 50.8 millimeters (2 inches) high on a white background;
  - (3) Activate a visible and audible alarm so that it can be seen and heard on the vessel where cargo transfer is controlled and in the cargo deck area; and
  - (4) Activate an alarm early enough to allow the person in charge of transfer operations to stop the cargo transfer before the tank overflows.
- (e) If a spill valve is installed on a cargo tank fitted with a vapor collection system, it must meet the requirements of [46 CFR 39.2009(a)(3)](/cfr/46/39.2009.md?p=a-3).
- (f) If a rupture disk is installed on a cargo tank fitted with a vapor collection system, it must meet the requirements of [46 CFR 39.2009(a)(4)](/cfr/46/39.2009.md?p=a-4).

## Notes

### Amendments

[USCG-1999-5150, 78 FR 42642, July 16, 2013, as amended by USCG-2016-0498, 82 FR 35089, July 28, 2017]

### 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.

### Amendments

[USCG-1999-5150, 78 FR 42642, July 16, 2013, as amended by USCG-2016-0498, 82 FR 35089, July 28, 2017]