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proposed LNG FG system design, anchored on the design of the FG mixing drum and pressure relief control system. In Scenario 1, where BOG compressors trip simultane- ously, the proposed pressure control configuration can han - dle the pressure swing by quickly switching the FG supply from BOG compressors to the NG supply. Additionally, the rate of change in pressure at the gas turbine inlet is kept at or below 3 psi per second. This is within the recommended allowable rate of change in pressure of ±10 psi per second. Furthermore, the dynamic model confirms that the FG mixing drum can dampen the sudden compositional change in FG. The MWI rate of change for the FG is 3% per minute, within the allowable rate of ±5% per minute as specified for gas turbine operations. For the case where one of the two gas turbines is tripped, the pressure surge is mainly controlled by the PCV sending FG to the flare header. The control scheme needs to be pro - grammed with a manual control to open to 100% within 10 seconds when the pressure hits 995 psig and then switch back to automatic control. With this modified control scheme, the pressure in the gas turbine main header increases to a maximum of 996 psig, within the set point of 1,000 psig. The study demonstrated that dynamic simulation is a rig- orous tool that can be used to validate not only the design and performance of an LNG FG system but also the process control configuration. Dynamic simulations offer valuable insight in the early stages of engineering design and can save a project both time and budget further down the road during construction and commissioning. References 1 Erickson D. M., Day S. A., Doyle R., Design Considerations for Heated Gas Fuel , GER-4189B, GE Power Systems, March 2003. https://www. gevernova.com/content/dam/gepower-new/global/en_US/downloads/ gas-new-site/resources/reference/ger-4189b-design-considera - tions-heated-gas-fuel.pdf. (Accessed 1 October 2024). Harry Z Ha is a Process Technical Fellow with Fluor Canada Ltd, hav- ing more than 30 years of experience in oil and gas industry R&D. In addition to process design, he focuses on data and methods devel- opment to support process modelling and simulations. Dr Ha holds an MSc in environmental engineering from Hong Kong University of Science and Technology and a PhD in chemical engineering from the University of Alberta, Canada. Email: harry.ha@fluor.com Cole Beattie is a Process Engineer-in-Training with Fluor Canada Ltd., working on the development and licensing of Fluor’s patented Econamine FG Plus technology for carbon capture in the energy and resources sec- tors and supporting Fluor’s proprietary Multi-Projects Group (MPG) with process modelling and simulations. He has three years of experience in the oil and gas industry and holds a bachelor’s degree in green process engineering, with distinction, and an honour’s in business administration from the University of Western Ontario, Canada. Javeed Mohammed is a Department Manager for the Instrumentation, Control Systems and Telecommunications Group for Fluor Canada Ltd. He joined Fluor in 2004 and has worked on three continents, total - ling 20 years of instrumentation and control systems experience in the office, fabrication yard and construction sites, and has held sev - eral lead roles on challenging projects. Mohammed holds a Master’s in electrical and computer science engineering from the University of Calgary and a Master’s in business administration from the Australian Institute of Business. Mission-critical solutions ARCHIVE

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