How to calculate head? ?
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Now I know that when selecting a pump, flow rate and head are required； The head is calculated using Bernoulli’s equation, but the pipeline resistance loss (does it refer to pressure drop?) ) Didn’t they say during the lecture that diameter calculation was necessary? What does it mean? Please ask an expert to help! ! Tell me how to calculate it! ! ! ! It would be best to have specific calculation examples! ! ! ! Thank you
HG-T 20570.5-95 \"Calculation of system characteristics of pumps and determination of the relative installation height of equipment\" HG-T 20570.7-95 \"Calculation of pipeline pressure drop\" HG-T 20570.6-95 \"Selection of pipe diameter\"
This post was last edited by 3983596_FPPZ on 2019-6-26 08:40. Are you a design institute? The pipe diameter is used to calculate the flow velocity; calculating the flow velocity is intended to determine the Reynolds number as well as the local/longitudinal losses, and determining the Reynolds number is done to verify the flow regime
This post was last edited by 3983596_FPPZ on 2019-6-26 08:42. Such examples can be found in many fluid mechanics textbooks; the general approach is to determine what pressure and flow rate are required for the downstream process parameters, then account for the flow losses in the pipes, in order to determine the pressure at the pump outlet as well as the pump’s flow rate and head； The inlet is exactly the opposite; the flow rate and pressure provided by the upstream process – with the pipeline losses taken into account to determine the pressure at the pump inlet – yield the NPSHA at the pump inlet as well as the pump’s flow rate. Of course, at this point the pump has not yet been selected, so parameters such as the pump’s diameter, center height, and NPSHR can only be estimated
This standard is quite old; I didn’t expect it still to be in use: lol