46 CFR § 30.10-13 - Cofferdam—tb/all.

---
identifier: "/us/cfr/t46/s30.10-13"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 30.10-13 - Cofferdam—TB/ALL."
title_number: 46
title_name: "Shipping"
section_number: "30.10-13"
section_name: "Cofferdam—TB/ALL."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "D"
subchapter_name: "TANK VESSELS"
part_number: "30"
part_name: "GENERAL PROVISIONS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "46 U.S.C. 2103, 3306, 3703; DHS Delegation No. 00170.1, Revision No. 01.4."
regulatory_source: "CGFR 65-50, 30 FR 16657, Dec. 30, 1965, unless otherwise noted."
cfr_part: "30"
---


# 30.10-13 Cofferdam—TB/ALL.

The term *cofferdam* means a void or empty space separating two or more compartments for the purpose of isolation or to prevent the contents of one compartment from entering another in the event of the failure of the walls of one to retain their tightness.