---
kind: "section"
citation: "46 C.F.R. § 153.1116"
title: "46"
number: "153.1116"
heading: "Prewash for tanks unloaded without following the approved Procedures and Arrangements Manual: Categories B and C."
url: "https://uscodex.org/cfr/46/153.1116"
---

# §153.1116. Prewash for tanks unloaded without following the approved Procedures and Arrangements Manual: Categories B and C.


If for any reason more Category B or C NLS residue remains in a cargo tank and transfer piping of a ship after unloading than would remain after a normal discharge of the cargo when the unloading procedures in the approved Procedures and Arrangements Manual are followed, the tank must be prewashed following the procedures in [§ 153.1120](/cfr/46/153.1120.md) unless—

- (a) [Section 153.1114](/cfr/46/153.1114.md) allows the prewash to be omitted; or
- (b) The residue is reduced using another procedure, and a Surveyor estimates and states in the Cargo Record Book that the cargo tank and transfer piping contain no more NLS residue than they would if discharged following the procedures in the approved Procedures and Arrangements Manual, and no other prewash is required by this part.

## Notes

### Source

Source: CGD 81-101, 52 FR 7785, Mar. 12, 1987, unless otherwise noted.

### 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.