Water Distribution System Reliability Under a Fire Flow Condition: A Probabilistic Approach

2005 ◽  
Author(s):  
Julio Gomes ◽  
Bryan W. Karney
Keyword(s):  
System Reliability ◽  
Distribution System ◽  
Flow Condition ◽  
Water Distribution ◽  
Water Distribution System ◽  
Probabilistic Approach ◽  
Distribution System Reliability

scholarly journals The influence of the existing network layout on water distribution system redesign analysis

2014 ◽  
Vol 16 (6) ◽  
pp. 1375-1389 ◽  
Author(s):  
C. Tricarico ◽  
M. S. Morley ◽  
R. Gargano ◽  
Z. Kapelan ◽  
G. de Marinis ◽  
...  
Keyword(s):  
System Reliability ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Optimal Solution ◽  
Optimal Solutions ◽  
Network Configuration ◽  
Decision Variables ◽  
The Impact ◽  
Optimisation Technique

The methodologies usually adopted in water distribution system redesign problems consider the topology of the network as an input fixed datum; optimisation solely allowing for the duplication/substitution of existing components. In order to contribute to the identification of optimal solutions that may lead to a lower risk of failure to supply the required water, together with a lower redesign cost, this paper proposes a novel methodology which reports the influence of the existing network configuration and its performance. In particular, the redundancy of loops and the robustness of the network topology are investigated by applying an optimisation technique based on a genetic algorithm and by taking into account the random water demand at each node. The methodology presented has been applied to two case studies, in which it considers the influence of the topology on the overall system reliability/risk. The results demonstrate that it is possible to obtain further configurations that are more reliable for a lower redesign cost. The analysis performed highlights the impact of the topology on the search for an optimal solution, which, as a principal conclusion of the work, should be considered among the decision variables taken into account by the optimisation in a redesign problem.

scholarly journals Probability of network disconnection of water distribution system for maintenance prioritization

2018 ◽  
Vol 67 (3) ◽  
pp. 252-269 ◽  
Author(s):  
Hieu Chi Phan ◽  
Ashutosh Sutra Dhar ◽  
Premkumar Thodi ◽  
Rehan Sadiq
Keyword(s):  
Failure Probability ◽  
System Reliability ◽  
Distribution System ◽  
Distribution Systems ◽  
Water Distribution ◽  
Water Distribution System ◽  
Water Distribution Network ◽  
Algebraic Connectivity ◽  
Network Failure ◽  
Pipe Segment

AbstractUnexpected pipe breaks in municipal water distribution systems may cause isolation of parts of the network or reduction of redundancy, leading to reduced system reliability. While a network with less redundancy implies less tolerance to further breaks, the isolation of nodes explicitly indicates unavailability of the system to service the nodes. This paper presents a method of measuring these topological changes using algebraic connectivity (AC). AC is a parameter that can be used to assess robustness and redundancy of a network. The changes in AC associated with pipe breaks are compared with the AC of intact networks to assess whether the removal of the pipe causes reduction of redundancy or isolation in the network. An AC of 1.5625 × 10−5 is calculated for an intake of a medium-sized water distribution network (WDN). The fluctuation in AC is used to assess the criticality of each pipe segment to the overall structure of the network. This study also evaluates the failure probability of the WDN, assuming that the network failure probability is equivalent to the probability of isolation of parts of the system due to pipe breaks. The breaks leading to the failure are identified using the method of the minimum cut-sets.

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