Automated Systems for loading and metering of Oil and LPG

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3D model of Automated Systems for Loading and Metering of Liquefied Petroleum Gas with the main elements description


Automated Systems for loading and metering of LPG are designed for the automatic delivery/acceptance and automated metering of oil and LPG in mass and/or volume units at the loading/discharge stations for rail and car tanks at the refineries and gas stations.

Principle of operation is based on the fact that LPG loaded into the rail tank cars passes through the mass flowmeter Micro Motion (or its analogue) installed on the pipeline of the liquid phase. Parallel to this diversion of the gas phase from the rail tank car for pressure equalizing is carried out. Diverted gas passes through the mass flowmeter Micro Motion (or its analogue) of a smaller diameter installed on the pipeline of vapor phase of LPG. Mass of delivered LPG is determined as the difference of mass flowmeter values of

Calibration of mass flowmeters of the loading station is performed with the help of Mobile Master Meter (MMM).

MMM is equipped with master mass flowmeter Micro Motion (or its analogues) connected sequentially with mass flowmeters of the loading station prior to loading/discharge operations.

Mass flowmeters of MMM are calibrated by master test measure or by other method. Manufactured according to Technical specifications 4213-010-9571- 5144-2011.

Technical characteristics

                                 Description        Value     
 1 Maximum permissible relative error for weighing of LPG         ±0,25
Upper range liquid phase flowrate value     On request
 3 Upper range vapor phase mass flowrate
   On request
 4 Density measurements range  From 0 to 2000 
 5 Maximum permissible absolute error of density measurement     ± 0,5 kg/m3
 6 Temperature measurement range          From -50°С
    tо +125°С 
 7 Maximum permissible absolute error of temperature measurement
 8 Pressure measurement range     0-5520 кPа
 9   Maximum permissible relative error of pressure measurement         ±0,2%
10  Overall dimensions    Depending
   on specified

LPG metering units manufactured by OGSB provide the following basic functions:

  • Automated process of loading/discharge of LPG tank cars;
  • Automated LPG weighing when loading/discharge of tank cars;
  • Liquid phase pressure control and maintenance to prevent LPG from boiling;
  • Reversible vapor phase exchange with vapor phase weighing during the pressure equalizing;
  • Dynamic analysis of the liquid phase composition (including ethane);
  • Dynamic calculation and maintenance of required cavitation margin in the cavity of the liquid phase flowmeter;
  • Automatic tank car filling/draining control;
  • Measurement results display and logging;
  • Fiscal storage of measured values, data transfer to upper level;
  • Remote and local power-driven valves control;
  • Automatic setting and maintenance of the flowrate at the filling line;
  • Receiving and processing primary transducer signals of temperature and pressure;
  • Flowmeters filling control;
  • Phase state control in the tank connecting piping;
  • On-site testing and control of flowmeters metrological parameters;
  • Emergency shutdown function (ESD).

Mobile Master Meter (MMM)

Mobile Master Meter is designed for mass calibration of the mass flowmeters, loading/discharge units, fluid meters, fuel dispensers and the other equipment for oil and LPG mass and volume metering. MMM is a device assembled on a single skid base comprising Micro Motion flowmeter(s), flow computer, pressure and temperature transmitters, piping, junction box, cabling. The meter is available in mobile and stationary versions.

Advantages of MMM over standard volumetric test measure or meter prover:

  1. Mass flow meter calibration employs direct mass comparison (operation “mass” to master “mass”);
  2. Overall accuracy of the Coriolis meter subjected to calibration is higher due to the exclusion of intermediate errors comprising volumetric measure, density meter and scales used for “master mass” measuring by the volumetric measure;
  3. Completely automated calibration process;
  4. No measure draining required;
  5. Lack of manual reduced volume and density calculation;
  6. Timely calibration procedure performance;
  7. Less overall dimensions and weight.

Manufactured according to Technical Specifications 4213-010-9571-5144-2011.