Pipe Flow Calculations Forum

It is important if you have or not enough flow rate - and as you say, in your mind you don't, but it is not sufficient information - what flow rate do you need as GPF does not give me information about GPM flow rate to try to calculate. Anyway the pressure should drop when you have flow rate, but if...

Here is the report for orifice calculation for you data: Orifice plate calculator CALCULATION REPORT 1. diameter (D1): D1 = 40 mm 2. diameter (D2): D2 = 5.55 mm 3. pressure on bigger diameter (p1): p1 = 10328.746 mmWS 4. pressure on smaller diameter (p2): p2 = 52274.996 Pa 5. pressure drop (p1-p2): ...

you can still find it within any calculator in the left part of under fluid properties.

You can use flow rate and diameter calculator at:
http://www.pipeflowcalculations.com/flowrate/index.htm
where if you enter water velocity of 2 m/s and density of 1000 kg/m3 you can get pipe diameter.

I think that you can solve it easily with calculator at: http://www.pipeflowcalculations.com/pressuredrop/index.htm There you enter flow rate 2500 l/s and other inputs except pressure drop. Changing pipe diameter and calculating you will have different values for pressure drop. Once you get 1000 mmW...

For your values I get velocity of 1.7 m/s which is ok for water, and it would be ok also if you are in the range of 2 m/s velocity.
More important is that the 4 psi pressure drop does not create cavitation and that there is sufficient pressure for the end user.

downybear wrote: MD: In nozzle which I have in my hand right now D1 is 4 mm, D2 is 2 mm. Output to intake is 4 mm as well.
Input looks like on your image.

So you have another nozzle like one my image but in mirror on output? Diameters changes from 4 - 2 - 4 mm?

Here is the model that might give us results - it is the outlet nozzle: image - injector 2.jpg Now, pressure at pos. 1 is the pressure measured by "pressure sensor" and pressure at pos. 2 is the pressure on the "pressure sensor intake" - right? Diameter at pos. 1 and 2. are neede...

Can you tell me if the scheme on the top is good representation of the problem?

To be able to upload you have to put it in .jpeg or similar.
Here are images with my scheme for the problem.