---
kind: "section"
citation: "33 C.F.R. § 157.15"
title: "33"
number: "157.15"
heading: "Slop tanks in tank vessels."
url: "https://uscodex.org/cfr/33/157.15"
---

# §157.15. Slop tanks in tank vessels.

- (a) **Number.** A tank vessel must have the following number of slop tanks that comply with the requirements of this section:
  - (1) A new vessel of less than 70,000 tons DWT and an existing vessel must have at least one slop tank.
  - (2) A new vessel of 70,000 tons DWT or more must have at least two slop tanks.
- (b) **Capacity.** Slop tanks must have the total capacity to retain oily mixtures from cargo tank washings, oil residue, and ballast water containing an oily mixture of 3 percent or more of the oil carrying capacity. Two percent capacity is allowed if there are—
  - (1) Segregated ballast tanks that meet the requirements in [§ 157.09](/cfr/33/157.09.md), [§ 157.10](/cfr/33/157.10.md), [§ 157.10a](/cfr/33/157.10a.md), or [§ 157.10b](/cfr/33/157.10b.md); or
  - (2) **No eductors arrangements that use water in addition to the washing water.**
- (c) **Design.** A slop tank required in this section:
  - (1) Must minimize turbulence, entrainment of oil, and the creation of an emulsion by the use of separate inlet and outlet connections; and
  - (2) **May carry bulk oil when not being used as a slop tank.**

## Notes

### Amendments

[CGD 74-32, 40 FR 48283, Oct. 14, 1975]

### Authority

Authority: 33 U.S.C. 1903; 46 U.S.C. 3703, 3703a (note); Department of Homeland Security Delegation No. 0170.1. Subparts G, H, and I are also issued under section 4115(b), Pub. L. 101-380, 104 Stat. 520; Pub. L. 104-55, 109 Stat. 546.

### Source

Source: CGD 74-32, 40 FR 48283, Oct. 14, 1975, unless otherwise noted.

### Amendments

[CGD 74-32, 40 FR 48283, Oct. 14, 1975]