46 CFR § 64.11 - Design of MPTs.

---
identifier: "/us/cfr/t46/s64.11"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 64.11 - Design of MPTs."
title_number: 46
title_name: "Shipping"
section_number: "64.11"
section_name: "Design of MPTs."
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"
---


# 64.11 Design of MPTs.

An MPT must be designed—

(a) In accordance with Section VIII of the ASME BPVC (incorporated by reference; see § 64.2) and this subpart;

(b) With a maximum gross weight of 55,000 pounds;

(c) To hold a liquid cargo that has a vapor pressure of 43 pounds per square inch absolute (psia) or less at a temperature of 122 °F;

(d) With a minimum service temperature of 0 °F or higher;

(e) With a maximum allowable working pressure of not less than 20 pounds per square inch gauge (psig) but not more than 48 psig; and

(f) To withstand dynamic loading conditions applied simultaneously.

[CGD 84-043, 55 FR 37410, Sept. 11, 1990; 55 FR 40755, Oct. 4, 1990; USCG-2020-0634, 89 FR 50199, June 12, 2024]