---
kind: "section"
citation: "46 C.F.R. § 129.570"
title: "46"
number: "129.570"
heading: "Overfill protection."
url: "https://uscodex.org/cfr/46/129.570"
---

# §129.570. Overfill protection.

- (a) This section applies to OSVs of at least 6,000 GT ITC (500 GRT if GT ITC is not assigned).
- (b) Each cargo oil tank with a capacity of 1,000 or more cubic meters (approximately 6,290 barrels) must have one overfill device that is permanently installed on each oil tank, with an intrinsically safe high-level alarm that meets the requirements of this section.
- (c) **The high-level alarm and tank overfill alarm required by paragraph (b) of this section must—**
  - (1) Be independent of each other;
  - (2) Alarm in the event of loss of power to the alarm system or failure of electrical circuitry to the tank level sensor; and
  - (3) Be able to be checked at the tank for proper operation prior to each transfer or contain an electronic self-testing feature that monitors the condition of the alarm circuitry and sensor.
- (d) **The high-level alarm required by paragraph (b) of this section must—**
  - (1) Alarm before the tank overfill alarm, but before the tank capacity goes below 95 percent;
  - (2) Be appropriately marked at the indicator panel; and
  - (3) Have audible and visible alarm indications that can be seen and heard on the vessel where oil transfer is controlled.
- (e) **The tank overfill alarm required by paragraph (b) of this section must—**
  - (1) Be independent of the oil gauging system;
  - (2) Alarm early enough to allow the person in charge of transfer operations to stop the transfer operation before the oil tank overflows;
  - (3) Be appropriately marked at the indicator panel; and
  - (4) Have audible and visible alarm indications that can be seen and heard on the vessel where oil transfer is controlled and in the cargo deck area.

## Notes

### Amendments

[USCG-2012-0208, 79 FR 48937, Aug. 18, 2014]

### Authority

Authority: 46 U.S.C. 3306; sec. 617, Pub. L. 111-281, 124 Stat. 2905; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: CGD 82-004 and CGD 86-074, 62 FR 49332, Sept. 19, 1997, unless otherwise noted.

### Amendments

[USCG-2012-0208, 79 FR 48937, Aug. 18, 2014]