Efficient flexibility assessment procedure for water network designs

Bao Hong Li, Chuei Tin Chang

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


A new nonlinear programming (NLP) formulation of the conventional flexibility index model (Swaney and Grossmann, 1985) has been developed in this work for flexibility analysis of single-contaminant water networks. Since this improved model is constructed on the basis of a single critical point instead of the entire region of uncertain parameters, the iterative optimization process converges at a much faster rate. A systematic flexibility assessment procedure has also been devised to analyze and modify a given network so as to achieve the desired level of operational resiliency. Specific design steps are followed sequentially to check the feasibility of a nominal design and to improve its flexibility index by (1) relaxing the upper limit of freshwater capacity and/or (2) adding new pipelines and/or removing existing ones. The effectiveness of the proposed approach is demonstrated with two examples in this paper.

Original languageEnglish
Pages (from-to)3763-3774
Number of pages12
JournalIndustrial and Engineering Chemistry Research
Issue number7
Publication statusPublished - 2011 Apr 6

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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