{"data":{"id":"us/43-cfr-3174.1","jurisdiction":"us","citation":"43 CFR 3174.1","heading":"Definitions and acronyms.","body":"(a) As used in this subpart, the term:\nBarrel (bbl) means 42 standard United States gallons.\nBase pressure means 14.696 pounds per square inch, absolute (psia).\nBase temperature means 60 °F.\nCertificate of calibration means a document stating the base prover volume and other physical data required for the calibration of flow meters.\nComposite meter factor means a meter factor corrected from normal operating pressure to base pressure. The composite meter factor is determined by proving operations where the pressure is considered constant during the measurement period between provings.\nConfiguration log means the list of constant flow parameters, calculation methods, alarm set points, and other values that are programmed into the flow computer in a CMS.\nCoriolis meter means a device which by means of the interaction between a flowing fluid and oscillation of tube(s) infers a mass flow rate. The meter also infers the density by measuring the natural frequency of the oscillating tubes. The Coriolis meter consists of sensors and a transmitter, which convert the output from the sensors to signals representing volume and density.\nCoriolis measurement system (CMS) means a metering system using a Coriolis meter in conjunction with a tertiary device, pressure transducer, and temperature transducer in order to derive and report gross standard oil volume. A CMS system provides real-time, on-line measurement of oil.\nDisplacement prover means a prover consisting of a pipe or pipes with known capacities, a displacement device, and detector switches, which sense when the displacement device has reached the beginning and ending points of the calibrated section of pipe. Displacement provers can be portable or fixed.\nDynamic meter factor means a kinetic meter factor derived by linear interpolation or polynomial fit, used for conditions where a series of meter factors have been determined over a range of normal operating conditions.\nEvent log means an electronic record of all exceptions and changes to the flow parameters contained within the configuration log that occur and have an impact on a quantity transaction record.\nGross standard volume means a volume of oil corrected to base pressure and temperature.\nIndicated volume means the uncorrected volume indicated by the meter in a lease automatic custody transfer system or the Coriolis meter in a CMS. For a positive displacement meter, the indicated volume is represented by the non-resettable totalizer on the meter head. For Coriolis meters, the indicated volume is the uncorrected (without the meter factor) mass of liquid divided by the density.\nInnage gauging means the level of a liquid in a tank measured from the datum plate or tank bottom to the surface of the liquid.\nLease automatic custody transfer (LACT) system means a system of components designed to provide for the unattended custody transfer of oil produced from a lease(s), unit PA(s), or CA(s) to the transporting carrier while providing a proper and accurate means for determining the net standard volume and quality, and fail-safe and tamper-proof operations.\nMaster meter prover means a positive displacement meter or Coriolis meter that is selected, maintained, and operated to serve as the reference device for the proving of another meter. A comparison of the master meter to the Facility Measurement Point (FMP) line meter output is the basis of the master-meter method.\nMeter factor means a ratio obtained by dividing the measured volume of liquid that passed through a prover or master meter during the proving by the measured volume of liquid that passed through the line meter during the proving, corrected to base pressure and temperature.\nNet standard volume means the gross standard volume corrected for quantities of non-merchantable substances such as sediment and water.\nOutage gauging means the distance from the surface of the liquid in a tank to the reference gauge point of the tank.\nPositive displacement meter means a meter that registers the volume passing through the meter using a system which constantly and mechanically isolates the flowing liquid into segments of known volume.\nQuantity transaction record (QTR) means a report generated by CMS equipment that summarizes the daily and hourly gross standard volume calculated by the flow computer and the average or totals of the dynamic data that is used in the calculation of gross standard volume.\nTertiary device means, for a CMS, the flow computer and associated memory, calculation, and display functions.\nTransducer means an electronic device that converts a physical property, such as pressure, temperature, or electrical resistance, into an electrical output signal that varies proportionally with the magnitude of the physical property. Typical output signals are in the form of electrical potential (volts), current (milliamps), or digital pressure or temperature readings. The term transducer includes devices commonly referred to as transmitters.\nVapor tight means capable of holding pressure differential only slightly higher than that of installed pressure-relieving or vapor recovery devices.\n(b) As used in this subpart, the following acronyms carry the meaning prescribed:\nAPI means American Petroleum Institute.\nCA has the meaning set forth in § 3170.3 of this part.\nCOA has the meaning set forth in § 3170.3 of this part.\nCPL means correction for the effect of pressure on a liquid.\nCTL means correction for the effect of temperature on a liquid.\nNIST means National Institute of Standards and Technology.\nPA has the meaning set forth in § 3170.3 of this part.\nPMT means Production Measurement Team.\nPSIA means pounds per square inch, absolute.\nS\u0026W means sediment and water.","path":["Title 43—Public Lands: Interior","Subtitle B—Regulations Relating to Public Lands","CHAPTER II—BUREAU OF LAND MANAGEMENT, DEPARTMENT OF THE INTERIOR","SUBCHAPTER C—MINERALS MANAGEMENT (3000)","PART 3170—ONSHORE OIL AND GAS PRODUCTION","Subpart 3174—Measurement of Oil"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-43.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:15Z","sha256":"474331abee5326d2da99bf8d5e7ac15c90e8d2d7472b94208f0c32984e51e659","source_id":"us-cfr","stale":true,"prev":"us/43-cfr-appendix-a-to-subpart-3173-of-part-3170","next":"us/43-cfr-3174.2"},"notice":"GroundRules: Original legal text. Not legal advice."}