49 CFR § 178.255-9 - Compartments.

---
identifier: "/us/cfr/t49/s178.255-9"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 178.255-9 - Compartments."
title_number: 49
title_name: "Transportation"
section_number: "178.255-9"
section_name: "Compartments."
chapter_name: "PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "C"
subchapter_name: "HAZARDOUS MATERIALS REGULATIONS"
part_number: "178"
part_name: "SPECIFICATIONS FOR PACKAGINGS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 5101-5128; 49 CFR 1.81 and 1.97."
cfr_part: "178"
---


# 178.255-9 Compartments.

(a) When the interior of the tank is divided into compartments, each compartment shall be designed, constructed and tested as a separate tank. Thickness of shell and compartment heads shall be determined on the basis of total tank capacity.

(b) [Reserved]