46 CFR § 64.17 - Minimum tank thickness.

---
identifier: "/us/cfr/t46/s64.17"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 64.17 - Minimum tank thickness."
title_number: 46
title_name: "Shipping"
section_number: "64.17"
section_name: "Minimum tank thickness."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "F"
subchapter_name: "MARINE ENGINEERING"
part_number: "64"
part_name: "MARINE PORTABLE TANKS AND CARGO HANDLING SYSTEMS"
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. 3306, 3703; 49 U.S.C. App. 1804; Department of Homeland Security Delegation No. 00170.1, Revision No. 01.3."
regulatory_source: "CGD 73-172, 39 FR 22950, June 25, 1974, unless otherwise noted."
cfr_part: "64"
---


# 64.17 Minimum tank thickness.

(a) Except as allowed in paragraph (b) of this section, a tank with a diameter of—

(1) 6 feet or less must have a shell and head of 
3/16 inch thickness or more; or

(2) More than 6 feet must have a shell and head of 
1/4 inch thickness or more.

(b) If the tank has additional framework to guard against accidental puncturing of the tank, the shell and head thickness must be 
1/8 inch or more.