Dynamic Modelling And Simulation Of Flare Systems

Preparing link to download Please wait... Download

E-Book Overview

Aker Solutions, 2012. — 14 p.
This Presentation includes and is based, inter alia, on forward-looking information and statements that are subject to risks and uncertainties that could cause actual results to differ. These statements and this Presentation are based on current expectations, estimates and projections about global economic conditions, the economic conditions of the regions and industries that are major markets for Aker Solutions ASA and Aker Solutions ASA’s (including subsidiaries and affiliates) lines of business. These expectations, estimates and projections are generally identifiable by statements containing words such as expects, believes, estimates or similar expressions. Important factors that could cause actual results to differ materially from those expectations include, among others, economic and market conditions in the geographic areas and industries that are or will be major markets for Aker Solutions’ businesses, oil prices, market acceptance of new products and services, changes in governmental regulations, interest rates, fluctuations in currency exchange rates and such other factors as may be discussed from time to time in the Presentation. Although Aker Solutions ASA believes that its expectations and the Presentation are based upon reasonable assumptions, it can give no assurance that those expectations will be achieved or that the actual results will be as et out in the Presentation. Aker Solutions ASA is making no representation or warranty, expressed or implied, as to the accuracy, reliab lity or completeness of the Presentation, and neither Aker Solutions ASA nor any of it is directors, officers or employees will have any liability to you or any other persons resulting from your use.

E-Book Content

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