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Aker Solutions, 2012. — 14 p.
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Preferred partner Dynamic modelling and simulation of Flare Systems Flow assurance and Dynamic Simulations Seminar, Stavanger 23.10.2012 Henriette Raddum | Process Specialist Engineer, Aker Solutions MMO Public © 2012 Aker Solutions Typical flare system ■ Purpose: ■ Protect equipment against overpressure from system malfunction or fire ■ Collect hydrocarbon gases and liquids from relief and depressurisation ■ Conduct relieved fluid to a location were it can be safely discharged Flare tip Flare sub header Pressure Safety Valve (PSV) Blowdown valve (BDV) Flare main header Flare KO Drum Pressure Control Valve (PV) From various process equipment ■ Typical relief sources: ■ Pressure Safety Valves (PSVs) ■ Blowdown valves (BDVs) ■ Pressure Control Valves (PVs) Public © 2012 Aker Solutions Preferred partner Typical simulation of flare systems ■ Steady state (SS) considerations traditionally used for flare system load evaluations (Flarenet) ■ Steady State (SS) simulations: ■ Initial peak rate “goes on forever” ■ Flare system volume not accounted for ■ No accumulation in system ■ Peak rate in = peak rate out ■ Why dynamic simulation (DS)? ■ ■ ■ ■ More realistic Less conservative Includes initial accumulation due to volume in flare network Peak flow out typically delayed and smaller than peak flow in Public © 2012 Aker Solutions Preferred partner Rules and regulations ■ API Standard 521 / ISO 23251 (Pressure-relieving and Depressuring Systems) about Dynamic Simulations (DS): ■ § 5.22 (Single system): ■ DS can be used to calculate transient pressure increases ■ DS can be used to calculate relief rates (PSVs) ■ Conventional methods are conservative and can give oversized relief and flare system designs. ■ Dynamic simulations are better to define the realistic relief loads and improves the understanding of what happens during relief ■ If the physical phenomena are not well understood, the dynamic model shall include conservative assumptions