{"data":{"id":"us/46-cfr-64.59","jurisdiction":"us","citation":"46 CFR 64.59","heading":"Spring loaded pressure relief valve.","body":"A spring loaded pressure relief valve must—\n(a) Be set at a nominal pressure of 125 percent of the maximum allowable working pressure;\n(b) Have a minimum normal venting capacity that is sufficient to prevent the tank pressure from exceeding 137.5 percent of the maximum allowable working pressure;\n(c) Close after discharge of a pressure not lower than 115 percent of the maximum allowable working pressure; and\n(d) If closed, remain closed at any pressure less than 115 percent of the maximum allowable working pressure.","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":"43d0bf8dc53197fe2c9e859efcdd68442d1316b589cb98d17935cf9b6e27d56c","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-64.57","next":"us/46-cfr-64.61"},"notice":"GroundRules: Original legal text. Not legal advice."}