![]() Using Hardy Cross equation, and table 20.3, The pipe diameters are now chosen by common sense as shown in Fig. In case of network of pipes having many loops, the system must be divided into two or more loops, such that each pipe in the network is included in the circuit of one loop. The minor losses are usually neglected, although they can be calculated by substituting an equivalent length of pipe. The value of x is taken 1.85 (as per Hazen Williams formula) in this method known as Hardy Cross Method. As a common practice + ve sign is given to the head losses in clockwise direction and – ve signs to those in the anti-clockwise direction. In this equation the numerator is obtained by the algebraic sum of the head losses in the various pipes of the closed loop. If the head loss in the pipe under reference is H t, it can be determined by the formula Now if Q a be the assumed flow in a pipe and Q be the actual flow in that pipe, then correction will be given by the relation The successive corrections are made in the flows in each pipe until the heads are balanced and the principle of continuity is satisfied at each junction. The head loss in each pipe is determined by pipe flow formula. In this method, the corrections are applied to the assumed flow in each successive trial. The following points highlight the top two methods used for the analysis of flow in a pipe network. ![]()
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