NDLI: Transient Evaluation for LPG and Oil Pipelines

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Meliande, Patricia Nascimento, Elson Antonio Do Lacerda, Rogerio Fernandes
Copyright Year	2010
Abstract	Nowadays, anticipating and controlling transient response is a critical design activity for ensuring both safety and integrity of the operational subsea system. Predicting transient effect, commonly known as surge pressure, is of high importance for offshore industry. In order to determine the installation of protection equipments to avoid surge pressure effects, the operational teams have raised concerns, whether the system is adequately designed to protect the subsea system against possible surge pressures during the event of sudden closure of a valve. Researches, referred to transient effects, explain that is necessary to evaluate the system performance under current and desired operating conditions. The main goal of this paper is to predict the surge pressure during unforeseen closure valves at Refrigerated LPG and Gasoline (C5+) pipeline systems. In these systems the valves are located downstream the flowlines. Detailed computer modeling attempts to simulate the complex interactions between flowline and fluid, aiming at providing efficient flowline system integrity. These models are based on Transient Methodology which is defined for a set of nonlinear partial differential equations that relate fundamental variables with pressure head and flow velocity. The solution of differential equations has been carried out by Finite Difference Method that transforms these equations into characteristic equations. These can be accurately solved through high-speed digital computers. Flowmaster, Chicago, USA, was the software used to develop the analysis models. The software offers an advanced graphical interface to build networks and resultant graphics. The results from Flowmaster have been validated through a defined methodology that applies the Characteristics Method based on Wylie and Streeter assumptions. Simulations considering the fluid as gasoline have shown a sudden damping of pressure wave when the valve closure time was 10 seconds, leading to the restoration of the initial flow conditions. The analysis using the Method of Characteristics, however, does not exhibit this sudden damping, although a gradually reduction of fluctuations around the initial pressure are observed. The transient analysis through Flowmaster for Refrigerated LPG leads to a pressure envelope that shows a change of the flow direction triggering a cyclical process until the restoration of the initial operational conditions.
Sponsorship	International Petroleum Technology Institute and the Pipeline Division
Starting Page	81
Ending Page	89
Page Count	9
File Format	PDF
ISBN	9780791844212
DOI	10.1115/IPC2010-31323
e-ISBN	9780791838853
Volume Number	2010 8th International Pipeline Conference, Volume 2
Conference Proceedings	2010 8th International Pipeline Conference
Language	English
Publisher Date	2010-09-27
Publisher Place	Calgary, Alberta, Canada
Access Restriction	Subscribed
Subject Keyword	Damping Computers Partial differential equations Pipelines Computer software Valves Waves Design Fluids Teams Engineering simulation Safety Transient analysis Finite difference methods Graphical user interfaces Computer simulation Pressure Surges Flow (dynamics) Transients (dynamics) Pipeline systems Simulation Gasoline Differential equations Fluctuations (physics) Ocean engineering
Content Type	Text
Resource Type	Article

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