Thanks Jesse, Your reply helped a lot explaining the pipeline behavior shown in my post. Let me itimise the conversation as follows: 1- Yes, the pipe diameter is the same along the entire length of the pipes, and the increase in the flow velocity is resulting - as per your reply - from the static head differences between (AV-1 and AV-2) and (AV-2 and St 1650+00). 2- If the flow calculated between the AVs are based on the differential level between them -when the HGL drops below pipe level during surge event- and this is unavoidable, then, may I consider this velocity as a software related assumption, and simply ignore the velocity diagram as long as the pressure envelope along the pipeline is acceptable? 3- Although the initial negative pressure value at AV 2 is -0.35m (which is considered acceptable), I'll modify the rising main profile to make sure that no negative pressure will take place when computing the initial conditions. Attached is a ZIP file containing the model. Regards, (Please visit the site to view this file)
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