{"data":{"id":"us/46-cfr-64.65","jurisdiction":"us","citation":"46 CFR 64.65","heading":"Vacuum relief device.","body":"(a) Each MPT that is designed for an external pressure of less than 7.5 psig must have a vacuum relief device.\n(b) A vacuum relief device for an MPT must—\n(1) Open at an external pressure of not less than 3 psig; and\n(2) Have an opening with a cross-section of 0.44 square inch or more.","path":["Title 46—Shipping","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER F—MARINE ENGINEERING","PART 64—MARINE PORTABLE TANKS AND CARGO HANDLING SYSTEMS","Subpart C—Pressure Relief Devices and Vacuum Relief Devices for MPTs"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-46.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:22Z","sha256":"a538da4c45c236b34b1d6de988d21d522623d9fa2370f110c5e582423aff7855","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-64.63","next":"us/46-cfr-64.67"},"notice":"GroundRules: Original legal text. Not legal advice."}