Model-based interoperability solutions for the supervision of smart gas distribution networks

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.

Download Full-text

An improvement of Hardy Cross method applied on looped spatial natural gas distribution networks

10.31219/osf.io/eus6g ◽

2017 ◽

Author(s):

Dejan Brkic

Keyword(s):

Gas Flow ◽

Solution Method ◽

Distribution Networks ◽

Original Method ◽

Gas Distribution ◽

Gas Network ◽

Hardy Cross ◽

Successive Substitution ◽

Newton Raphson ◽

Looped Network

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.

Download Full-text

The use of "absolutely reliable cameras" in the supply of natural gas to agricultural facilities

The Agrarian Scientific Journal ◽

10.28983/asj.y2020i1pp60-65 ◽

2020 ◽

pp. 60-65

Author(s):

Aleksey Konstantinovich Klochko ◽

Viktor Andreevich Zhila

Keyword(s):

Natural Gas ◽

Reliability Index ◽

Distribution Networks ◽

Gas Distribution ◽

Reliability Indices

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.

Download Full-text

Numerical Monitoring of Natural Gas Distribution Discrepancy Using CFD Simulator

Journal of Applied Mathematics ◽

10.1155/2010/407648 ◽

2010 ◽

Vol 2010 ◽

pp. 1-23 ◽

Cited By ~ 3

Author(s):

Vadim E. Seleznev

Keyword(s):

Natural Gas ◽

Distribution System ◽

Field Measurements ◽

Identification Problem ◽

Distribution Networks ◽

Reference Points ◽

Gas Distribution ◽

Natural Gas Transmission ◽

Minimum Discrepancy ◽

Gas Supply

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.

Download Full-text