{"data":{"id":"us/33-cfr-157.12a","jurisdiction":"us","citation":"33 CFR 157.12a","heading":"a Definitions.","body":"As used in §§ 157.12a through 157.12g—\nControl section means a unit in a monitoring system composed of the items specified in § 157.12d(a)(4)(viii).\nControl unit means a device that receives automatic signals of oil content of the effluent ppm, flow rate of discharge m 3/hour, ship's speed in knots, ship's position-latitude and longitude, date and time (GMT, Greenwich Mean Time), and status of the overboard discharge control. The control unit makes automatic recordings of data as specified in § 157.12d(h)(2).\nOil discharge monitoring and control system or monitoring system means a system that monitors the discharge into the sea of oily ballast or other oil-contaminated water from the cargo tank areas and comprises the items specified in § 157.12d(a)(4).\nOverboard discharge control means a device that automatically initiates the sequence to stop the overboard discharge of the effluent in alarm conditions and prevents the discharge throughout the period the alarm condition prevails. The device may be arranged to close the overboard valves or to stop the relevant pumps, as appropriate.\nPPM means parts of oil per million parts of water by volume.\nStarting interlock means a facility that prevents the initiation of the opening of the discharge valve or the operation of other equivalent arrangements before the monitoring system is fully operational when use of the monitoring system is required by the Convention.","path":["Title 33—Navigation and Navigable Waters","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER O—POLLUTION","PART 157—RULES FOR THE PROTECTION OF THE MARINE ENVIRONMENT RELATING TO TANK VESSELS CARRYING OIL IN BULK","Subpart B—Design, Equipment, and Installation"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-33.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:35Z","sha256":"af8b02d34bc67680241452e1ab235a31d691628b9a957a49bca6df43446babdd","source_id":"us-cfr","stale":true,"prev":"us/33-cfr-157.12","next":"us/33-cfr-157.12b"},"notice":"GroundRules: Original legal text. Not legal advice."}