§ 3174.8 LACT system—components and operating requirements. ( a ) *LACT system components.* Each LACT system must include all of the equipment listed in API 6.1 (incorporated by reference, see § 3174.3), with the following exceptions: ( 1 ) The custody transfer meter must be a positive displacement meter or a Coriolis meter. The specific make, models, and sizes of positive displacement or Coriolis meter and associated software that are identified and described at *www.blm.gov* are approved for use.
( 2 ) An electronic temperature averaging device must be installed.
( 3 ) Meter back pressure must be applied by a back pressure valve or other controllable means of applying back pressure to ensure single-phase flow.
( b ) *LACT system operating requirements.* Operation of all LACT system components must meet the requirements of API 6.1 (incorporated by reference, see § 3174.3) and the following: ( 1 ) Sampling must be conducted according to API 8.2 and API 8.3 (both incorporated by reference, see § 3174.3) and the following: ( i ) The sample extractor probe must be inserted within the center half of the flowing stream;
( ii ) The extractor probe must be horizontally oriented; and
( iii ) The external body of the extractor probe must be marked with the direction of the flow.
( 2 ) Any tests conducted on oil samples extracted from LACT system samplers for determination of oil gravity and S&W content must meet the requirements of either API 9.1, API 9.2, or API 9.3, and API 10.4 (all incorporated by reference, see § 3174.3).
( 3 ) The composite sample container must be emptied and cleaned upon completion of sample withdrawal.
( 4 ) The positive displacement or Coriolis meter (see § 3174.10) must be equipped with a non-resettable totalizer. The meter must include or allow for the attachment of a device that generates at least 8,400 pulses per barrel of registered volume.
( 5 ) The system must have a pressure-indicating device downstream of the meter, but upstream of meter-proving connections. The pressure-indicating device must be capable of providing pressure data to calculate the CPL correction factor.
( 6 ) An electronic temperature averaging device must be installed, operated, and maintained as follows: ( i ) The temperature sensor must be placed in compliance with API 7 (incorporated by reference, see § 3174.3);
( ii ) The electronic temperature averaging device must be volume-weighted and take a temperature reading following API 21.2, Subsection 9.2.8 (incorporated by reference, see § 3174.3);
( iii ) The average temperature for the measurement ticket must be calculated by the volumetric averaging method using API 21.2, Subsection 9.2.13.2a (incorporated by reference, see § 3174.3);
( iv ) The temperature averaging device must have a reference accuracy of ±0.5 °F or better, and have a minimum graduation of 0.1 °F; and
( v ) The temperature averaging device must include a display of instantaneous temperature and the average temperature calculated since the measurement ticket was opened.
( vi ) The average temperature calculated since the measurement ticket was opened must be used to calculate the CTL correction factor.
( 7 ) Determination of net standard volume: Calculate the net standard volume at the close of each measurement ticket following the guidelines in API 12.2.1 and API 12.2.2 (both incorporated by reference, see § 3174.3).