You need to regroup your thoughts and ask the question in a different way so that it makes sense. There is no piping in a pool pump. Do you mean to and from the pool to the equipment pad? Between the pump and the filter or between the filter and the heater? You have to be specific.
There is insufficient head in your piping. is your tub half full when it surged? if it is, that means ur tub pressure before surging has the same pressure as ur piping. simply put it, ur piping is working it way up to ur tub in a vertical piping which is too high. do u have a pump? if it is natural flow, that means your well does not have sufficent volume. when insufficient volume, u do not have the weight to hold the pressure in the piping. fluid flow will always try to find its equilibrium. when it reaches, it will stop. its starts to surge back after a few seconds due to the inertia of the water. when equilibrium, the water will surge back to the well. if there is no pump, install one. that will solve all problems. if u have a pump, ur pump in undersized to do the work required which is in this case to push water out from the piping in to ur tub. u will need a larger capacity pump rating. i hope
A red-line drawings is essentially an intermediate drawing that shows corrections or changes to a previous drawing. The term red line literally comes from the (typically) red pen used to amend the drawings by hand. These changes mark-ups show changes made to the drawing subject matter during the manufactuer or construction of the product. For example, piping drawings were developed at the onset of a project to build a new school. During the course of construction for that school, the piping contractors changes several elements of the design (pipe size, routing, orientation etc). At the end of the project, the constructor would "red line" the drawings showing those changes. Red-lines are used to then develop record drawings. Record drawings, also called "as-builts" accurately reflect what was constructed and are used for future work and/or reference.
Let me differentiate first between design pressure and mechanical design pressure. Design (or discharge) pressure is the pressure at the outlet of the pump, the pressure you've designed the pump to deliver. The mechanical design pressure is a value that the pump casing and downstream piping have to be able to withstand as a minimum*. I presume you mean design pressure as discharge pressure. In this case, differential pressure is the difference between the discharge pressure and the suction pressure (the pressure at the inlet of the pump**). * this is calculated taking into account that a pump would be working against a 'blocked discharge' or a closed valve in the outlet piping ** imagine a reservoir filled with liquid
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