DESIGN OF MATLAB-BASED VIRTUAL METERING SYSTEM ON INTEGRATED AUTOMATION SYSTEM PLATFORM WITH STANDARD VOLUME CALCULATION FOR OIL FUEL

• Main Author: Akbar Ramadhan, Ilham
• Format: Final Project
• Language: Indonesia
• Subjects: Fisika
• Online Access: https://digilib.itb.ac.id/gdl/view/60913
• Institution: Institut Teknologi Bandung

In custody transfer, metering skid system is the main measuring element used to measure the quantity of fuel oil. The quantity of fluid is generally measured in volume, which is converted to basic conditions before presentation, at base conditions of 15°C and 101.25 kPa (SI units), according to the standard volume calculation method referring to the API MPMS standard. The accuracy of the instrument in metering skid can affect the fluid quantity measurement, with an accuracy requirement of 0.5% for standard volume calculations on custody transfer. In this study, a virtual metering skid system will be designed, which can do the standard volume calculations, using signal injector as signal emulator and Matlab as flow computer. The signal injector will generate signal representing metering skid instruments in the form of a voltage and sent it to the PLC and Arduino controller (10 bits), which will be send to Matlab-based flow computer, GUI (Graphical User Interface) Matlab, through the communication protocol standardization by OPC (OLE for Process Control). The Matlab GUI will perform standard volume calculations using input parameters, either from the emulator or from direct user input on GUI. Based on the designed system, it is known that the PLC and Arduino controllers used (10 bits) are not suitable for metering skid measurement operation for instrument’s operating range, with a count error for PLC is a minimum of 1.466% and a maximum of 3.03%, as well as a count error for Arduino is a minimum 0.488% and a maximum of 1.564%. For the GUI Matlab flow computer, the system successfully performs a standard volume calculation and displays it in the GUI. The designed system can also find the effect of metering skid instrument’s accuracy on standard volume calculation at the specified test point. For temperature transmitters with an accuracy of ±0.1°C, the standard volume calculation difference reaches the range of -0.01% to +0.02%. For pressure transmitters with an accuracy of ±0.14%, the difference on standard volume calculation is not detected, because the change in the pressure correction factor due to the pressure transmitter’s accuracy deviation is very small. And then, for density measurement with an accuracy of ±0,2%, the standard volume calculation difference reaches the range of 0 to +0.01%. Finally, for the combined accuracy of the instrument, the standard volume calculation biggest difference reaches 0,1%, which is still acceptable because it is within the standard of custody transfer accuracy, in the range of ?0,5%.