46 CFR § 45.121 - Freeing port area: Changes for trunks and side coamings.

---
identifier: "/us/cfr/t46/s45.121"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 45.121 - Freeing port area: Changes for trunks and side coamings."
title_number: 46
title_name: "Shipping"
section_number: "45.121"
section_name: "Freeing port area: Changes for trunks and side coamings."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "E"
subchapter_name: "LOAD LINES"
part_number: "45"
part_name: "GREAT LAKES LOAD LINES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "46 U.S.C. 5104, 5108; Department of Homeland Security Delegation No. 0170.1."
regulatory_source: "CGD 73-49R, 38 FR 12290, May 10, 1973, unless otherwise noted."
cfr_part: "45"
---


# 45.121 Freeing port area: Changes for trunks and side coamings.

If a vessel has a trunk and does not meet the requirements of § 45.61 or has continuous or substantially continuous hatchway side coamings between detached superstructures, the minimum area of the freeing port openings must be obtained from the following table:

| Breadth of hatchway or trunk in relation to the breadth of ship | Area of freeing ports in relation to the total area of the bulwarks (percent) |
| --- | --- |
| 40 percent or less | 20 |
| 75 percent or more | 10 |

The area of freeing ports at intermediate breadths must be obtained by linear interpolation.