Could some expert help me calculate how much head pressure is required in this situation?
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For 316L pipes with dimensions of φ31.8×1.5, a minimum flow rate of 1.2 m/s is required. What pressure head does the pump need to have? Waiting for an answer online
Where is the pump, and where are the pipes? The pump is on the cliff, the pipes are in the canyon – what more head pressure do we need? The pump is in the canyon, the pipes are on the cliffs; the static head needs to be taken into account ； The pipe is at the pump outlet, extending horizontally; so just do the calculation.
Logically, there should be a formula for this; you can search for it
The end of the pipe is about 2 meters higher than the pump, and the pipe length is 70 meters. . . . And how is this supposed to be calculated? I don’t understand it
Is your description still not enough? Is the tube straight? Curved? Up and down bends, left and right bends, slope pipes? . . . . Is anyone here? @greensnow @lushiru @He Qingwei @*aofan8752
The pipe has bends upwards and downwards; there are just two elbows
I shouldn’t be too precise either; just give a rough estimate. . .
Could you, like when squeezing toothpaste, clearly write down the relevant conditions for the problem on the first floor? Not many people have as much time as I do to keep posting back and forth. :handshake
Pumps aren’t selected in this way; first, what type of pump? Centrifugal pump or reciprocating pump? In the case of a centrifugal pump, first use Bernoulli’s equation to calculate the head He. When calculating this head, it is necessary to take into account the height difference, the pressure head generated by the pressure difference before and after the pump (the difference between the pressure in the suction device and that in the inlet device), as well as the pressure head lost due to friction (pipe friction and local losses). Then, the head He is added to the flow rate Q of the medium being transported, and a preliminary selection is made using the relevant data. Once this preliminary selection is complete, the allowable installation height of the pump is determined based on the performance parameters of the centrifugal pump and the saturated vapor pressure of the medium being transported. If the medium being transported is not water, a centrifugal pump is not the appropriate choice. Based on the poster’s experience, it’s best to provide all the parameters to a professional manufacturer so that they can help select the right pump.
For a centrifugal pump, if high precision isn’t required, the person asking can provide the pressures of the equipment before and after the pump, the height difference between the two pieces of equipment (not how much higher the outlet pipe is than the pump), the density of the fluid being transported, as well as the number of valves and fittings; this will allow for an approximate estimation.
The experts here are truly patient. Based solely on the conditions you provided, it seems that a rough tube isn’t sufficient; based on the flow velocity, only the dynamic head loss can be calculated, and the additional lift height and other factors need to be taken into account as well. Then leave a bit more margin