In order to calculate the total resistance loss of the pipe network, first of all, the resistance loss of the individual pipelines of each section should be determined and then superimposed according to the characteristics of the strings and the parallel connections of the pipelines. First, when the flow of tandem pipeline is constant, add the resistance loss value (see Figure 2-99), ie, when the resistance loss value of Hun = Hva + Hvb parallel pipeline is certain, the flow value summation (see Figure 2-100) : Qn = Qa + Qb
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