46 CFR § 151.40-11 - Refrigeration systems.

---
identifier: "/us/cfr/t46/s151.40-11"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 151.40-11 - Refrigeration systems."
title_number: 46
title_name: "Shipping"
section_number: "151.40-11"
section_name: "Refrigeration systems."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "O"
subchapter_name: "CERTAIN BULK DANGEROUS CARGOES"
part_number: "151"
part_name: "BARGES CARRYING BULK LIQUID HAZARDOUS MATERIAL CARGOES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "33 U.S.C. 1903; 46 U.S.C. 3703; Department of Homeland Security Delegation No. 0170.1."
regulatory_source: "CGFR 70-10, 35 FR 3714, Feb. 25, 1970, unless otherwise noted."
cfr_part: "151"
---


# 151.40-11 Refrigeration systems.

(a) *Boiloff systems.* The venting of cargo boiloff to atmosphere shall not be used as a primary means of temperature or pressure control unless specifically authorized by the Commandant.

(b) Vapor compression, tank refrigeration, and secondary refrigeration systems: The required cooling capacity of refrigeration systems shall be sufficient to maintain the cargo at design operating conditions with ambient temperature of 115 °F still air and 90 °F still water. The number and arrangement of compressors shall be such that the required cooling capacity of the system is maintained with one compressor inoperative. Portions of the system other than the compressors need not have standby capacity.