---identifier: "/us/cfr/t33/s157.158"source: "ecfr"legal_status: "authoritative_unofficial"title: "33 CFR § 157.158 - COW operations: Changed characteristics."title_number: 33title_name: "Navigation and Navigable Waters"section_number: "157.158"section_name: "COW operations: Changed characteristics."chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"subchapter_number: "O"subchapter_name: "POLLUTION"part_number: "157"part_name: "RULES FOR THE PROTECTION OF THE MARINE ENVIRONMENT RELATING TO TANK VESSELS CARRYING OIL IN BULK"positive_law: falsecurrency: "2026-03-24"last_updated: "2026-03-24"format_version: "1.1.0"generator: "[email protected]"authority: "33 U.S.C. 1903; 46 U.S.C. 3703, 3703a (note); Department of Homeland Security Delegation No. 0170.1. Subparts G, H, and I are also issued under section 4115(b), Pub. L. 101-380, 104 Stat. 520; Pub. L. 104-55, 109 Stat. 546."regulatory_source: "CGD 74-32, 40 FR 48283, Oct. 14, 1975, unless otherwise noted."cfr_part: "157"---
Identifier
/us/cfr/t33/s157.158
Currency
2026-03-24
Positive Law
No
Updated
2026-03-24
Chapter
Coast Guard, Department of Homeland Security
Authority
33 U.S.C. 1903; 46 U.S.C. 3703, 3703a (note); Department of Homeland Security Delegation No. 0170.1. Subparts G, H, and I are also issued under section 4115(b), Pub. L. 101-380, 104 Stat. 520; Pub. L.... 33 U.S.C. 1903; 46 U.S.C. 3703, 3703a (note); Department of Homeland Security Delegation No. 0170.1. Subparts G, H, and I are also issued under section 4115(b), Pub. L. 101-380, 104 Stat. 520; Pub. L. 104-55, 109 Stat. 546.
# 157.158 COW operations: Changed characteristics.The COW system may be operated with characteristics that do not meet those recorded under § 157.150(b) only if:(a) The tank vessel passes the inspections under § 157.140 using the changed characteristics;(b) The changed characteristics used to pass the inspections under § 157.140 are recorded in the *Crude Oil Washing Operations and Equipment Manual* approved under § 157.112; and(c) The Coast Guard issues to the tank vessel an amending letter stating that the tank vessel complies with this subpart with these characteristics.