Pipes In Parallel When two or more pipes are connected, as shown in Fig. 36.3, so that the flow divides and subsequently comes together again, the pipes are said to be in parallel. In this case (Fig. 36.3), equation of continuity gives (36.5) where, Q is the total flow rate and and are the flow rates through pipes A and B respectively. Loss of head between the locations 1 and 2 can be expressed by applying Bernoulli's equation either through the path 1-A-2 or 1-B-2. Therefore, we can write