scholarly journals Integrated Planning of Operational Maintenance Programs for Water and Gas Distribution Networks

2021 ◽  
Vol 27 (4) ◽  
pp. 04021039
Author(s):  
Sean Kerwin ◽  
Bryan T. Adey
2013 ◽  
Vol 07 (02) ◽  
pp. 1350005 ◽  
Author(s):  
GIAN PAOLO CIMELLARO ◽  
ALESSANDRO DE STEFANO ◽  
OMAR VILLA

The concept of disaster resilience has received considerable attention in recent years and it is increasingly used as an approach for understanding the dynamics of natural disaster systems. No models are available in literature to measure the performance of natural gas network, therefore, in this paper, a new performance index measuring functionality of gas distribution network have been proposed to evaluate the resilience index of the entire network. It can be used for any type of natural or manmade hazard which might lead to the disruption of the system. The gas distribution network of the municipalities of Introdacqua and Sulmona, two small towns in the center of Italy which were affected by 2009 earthquake have been used as case study. Together the pipeline network covers an area of 136 km2, with 3 M/R stations and 16 regulation groups. The software SynerGEE has been used to simulate different scenario events. The numerical results showed that, during emergency, to ensure an acceptable delivery service, it is crucial to guarantee the functionality of the medium pressure gas distribution network. Instead to improve resilience of the entire network the best retrofit strategy is to include emergency shutoff valves along the pipes.


2017 ◽  
Author(s):  
Dejan Brkic

Hardy Cross method is common for calculation of loops-like gas distribution networks with known node gas consumptions. This method is given in two forms: original Hardy Cross method-successive substitution methods and improved-simultaneous solution method (Newton-Raphson group of methods). Problem of gas flow in looped network is nonlinear problem; i.e. relation between flow and pressure drop is not linear while relation between electric current and voltage is. Improvement of original method is done by introduction of influence of adjacent contours in Yacobian matrix which is used in calculation and which is in original method strictly diagonal with all zeros in non-diagonal terms. In that way necessary number of iteration in calculations is decreased. If during the design of gas network with loops is anticipated that some of conduits are crossing each other without connection, this sort of network became, so there has to be introduced corrections of third or higher order.


2020 ◽  
pp. 60-65
Author(s):  
Aleksey Konstantinovich Klochko ◽  
Viktor Andreevich Zhila

The paper considers the supply of agricultural facilities with natural gas. The methodology and algorithm for determining the reliability index of gas distribution networks are presented. The concept of “absolutely reliable camera” is disclosed. Reliability indices and technical and economic characteristics of various schemes and configurations of gas distribution networks are determined. The issue of the use of "absolutely reliable cameras" for agricultural facilities is considered.  


2010 ◽  
Vol 2010 ◽  
pp. 1-23 ◽  
Author(s):  
Vadim E. Seleznev

The paper describes a new method for numerical monitoring of discrepancies in natural gas supply to consumers, who receive gas from gas distribution loops. This method serves to resolve the vital problem of commercial natural gas accounting under the conditions of deficient field measurements of gas supply volumes. Numerical monitoring makes it possible to obtain computational estimates of actual gas deliveries over given time spans and to estimate their difference from corresponding values reported by gas consumers. Such estimation is performed using a computational fluid dynamics simulator of gas flows in the gas distribution system of interest. Numerical monitoring of the discrepancy is based on a statement and numerical solution of identification problem of a physically proved gas dynamics mode of natural gas transmission through specified gas distribution networks. The identified mode parameters should have a minimum discrepancy with field measurements of gas transport at specified reference points of the simulated pipeline network.


2018 ◽  
Vol 229 ◽  
pp. 253-263 ◽  
Author(s):  
Ermanno Lo Cascio ◽  
Bart De Schutter ◽  
Corrado Schenone

Author(s):  
Olga M. Alekhina ◽  
Alina I. Anapolskaya ◽  
Yuliya S. Kanina

We present a legal regulation analysis of procedure for cutting down emergency trees and trees and shrubs located in the protected zone of the gas pipeline, which poses a threat to the safety and functioning of gas networks. The purpose of study is to determine the subjects and the proce-dure for cutting down emergency trees in the security zone of gas pipeline, as well as to assess the regulatory regulation of procedure for cutting down emergency trees in the security zone of gas pipeline, taking into account the balance of interests of gas distribution organizations, local authorities and citizens – owners of land plots. The research methodology is based on a sys-tematic approach in the analysis of the legal regulation of the subject of re-search, formal legal, logical methods of cognition, which together ensure the reliability and validity of conclusions and proposals on the algorithm for solving the issue of cutting down trees and shrubs in the protective zone of the gas pipeline. We conclude that there is variability in the regulation of the elimination of emergency trees, taking into account such conditions as the location of the gas pipeline security zone (ownership of territory) and the owner of the land plot on which the trees are located. We state that the pres-ence of tree plantations in the security zone of gas distribution networks is not prohibited by law, but there is a procedure for the owner of land plots and gas networks to remove trees that potentially pose a threat to the safety of the gas pipeline within the security zone. The legislation unambiguously determines that the person who is obliged to carry out work on cutting down trees and sawing off branches is the owner of the land plot. All work on cutting trees must be carried out taking into account the interests of the gas distribution organization, the owner of the gas pipeline and a real threat to the safety of the gas pipeline. We formulate recommendations for effective building of interaction between subjects interested in resolving the problems of finding emergency trees in the protected zone of the gas pipeline.


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