Modeling and simulation for PIG with bypass flow control in natural gas pipeline

Citation
Tt. Nguyen et al., Modeling and simulation for PIG with bypass flow control in natural gas pipeline, KSME INT J, 15(9), 2001, pp. 1302-1310
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Mechanical Engineering
Journal title
KSME INTERNATIONAL JOURNAL
ISSN journal
1226-4865 → ACNP
Volume
15
Issue
9
Year of publication
2001
Pages
1302 - 1310
Database
ISI
SICI code
1226-4865(200109)15:9<1302:MASFPW>2.0.ZU;2-H
Abstract
This paper introduces modeling and simulation results for pipeline inspecti on gauge (PIG) with bypass flow control in natural gas pipeline. The dynami c behaviour of the PIG depends on the different pressure across its body an d the bypass flow through it. The system dynamics includes: dynamics of dri ving gas flow behind the PIG, dynamics of expelled gas in front of the PIG, dynamics of bypass flow, and dynamics of the PIG. The bypass flow across t he PIG is treated as incompressible flow with the assumption of its Mach nu mber smaller than 0.45. The governing nonlinear hyperbolic partial differen tial equations for unsteady gas flows are solved by method of characteristi cs (MOC) with the regular rectangular grid under appropriate initial and bo undary conditions. The Runge-Kuta method is used for solving the steady flo w equations to get initial flow values and the dynamic equation of the PIG. The sampling time and distance are chosen under Courant-Friedrich-Lewy (CF L) restriction. The simulation is performed with a pipeline segment in the Korea Gas Corporation (KOGAS) low pressure system, Ueijungboo-Sangye line. Simulation results show us that the derived mathematical model and the prop osed computational scheme are effective for estimating the position and vel ocity of the PIG with bypass flow under given operational conditions of pip eline.