{"data":{"id":"us/30-cfr-250.457","jurisdiction":"us","citation":"30 CFR 250.457","heading":"What equipment is required to monitor drilling fluids?","body":"Once you establish drilling fluid returns, you must install and maintain the following drilling fluid-system monitoring equipment throughout subsequent drilling operations. This equipment must have the following indicators on the rig floor:\n(a) Pit level indicator to determine drilling fluid-pit volume gains and losses. This indicator must include both a visual and an audible warning device;\n(b) Volume measuring device to accurately determine drilling fluid volumes required to fill the hole on trips;\n(c) Return indicator devices that indicate the relationship between drilling fluid-return flow rate and pump discharge rate. This indicator must include both a visual and an audible warning device; and\n(d) Gas-detecting equipment to monitor the drilling fluid returns. The indicator may be located in the drilling fluid-logging compartment or on the rig floor. If the indicators are only in the logging compartment, you must continually man the equipment and have a means of immediate communication with the rig floor. If the indicators are on the rig floor only, you must install an audible alarm.","path":["Title 30—Mineral Resources","CHAPTER II—BUREAU OF SAFETY AND ENVIRONMENTAL ENFORCEMENT, DEPARTMENT OF THE INTERIOR","SUBCHAPTER B—OFFSHORE","PART 250—OIL AND GAS AND SULPHUR OPERATIONS IN THE OUTER CONTINENTAL SHELF","Subpart D—Oil and Gas Drilling Operations"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-30.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:24Z","sha256":"4eec01cf5f4bfa311ac9cef8094728d10c612571af4865485673af8279a34d90","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-250.456","next":"us/30-cfr-250.458"},"notice":"GroundRules: Original legal text. Not legal advice."}