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JUL-AUG 2018

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INTECH JULY/AUGUST 2018 37 SPECIAL SECTION structability challenges. The vendor selection was biding based, since the GWR instruments from both vendors demonstrated a superior and equal performance. The project's final scope of work was revised as follows: Measurement technology and setup: l GWR shall be used for inventory tank gauging for the Riyadh Refinery proj- ect. l For tanks with no stilling piping (e.g., tanks with a cone or internal floating roof ), there is no need to install still- ing pipes. l For temperature measurement and since this application is inventory, a spot temperature sensor shall be used as it is allowed by API MPMS chapter 7. l A pressure transmitter shall be in- stalled at the bottom of each tank to assist in mass calculations. Communication protocol: Foundation Fieldbus (FF): l The existing FF segments in the re- finery tank farm have been verified and found feasible to accommodate the new GWR instruments in this project. l The existing asset management plat- form in the RR tank farm (i.e., PRM from Yokogawa) will be used for maintenance. Tank inventory calculations: DCS shall be used, as it has the capabil - ity to perform the inventory calcula- tions addressed in API MPMS chapter 12.1.1. The Yokogawa Tank Inventory Man- agement Module was configured as the existing DCS at the refinery. This step has eliminated proprietary hardware and software for the tank inventory calculations. Figure 10. GWR echo curves on RYT-70 and IZ01-D006 Economical solution The journey of the Saudi Aramco tank gauging project has resulted in a simple, reliable, and highly economi- cal system for inventory tank gaug- ing. This solution demonstrated full compliance with API MPMS chapter 3.1B in terms of accuracy and per- formance. Moreover, it provides a versatile solution, which allows dif- ferent hardware and communication protocols to be used and allows DCS as a platform for software inventory calculations. It is important to highlight that GWR has fundamental rules set by the manufacturers for selection, in - stallation, and commissioning. Fol- lowing these rules will guarantee successful performance. Deviating from these requirements can gener - ate unpleasant challenges and errors in measurement. The GWR success story has also opened another opportunity for using two-wire noncontact radar for inven - tory tank gauging, as these noncontact radar instruments have the capability to meet the requirements of API MPMS chapter 3.1B. They can be very useful in applications like molten sulfur and asphalt. This success story had an impact not only on the Riyadh Refinery project, but also on Saudi Aramco standards, which have been revised to specify Figure 11. GWR echo curves on RYT-72 Envelope curve

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