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Suggestions for flow nozzle design please.

Suggestions for flow nozzle design please.

Suggestions for flow nozzle design please.

(OP)
I'm having trouble getting various flow curves in my hydronic system to agree with each other. My thought was to make a simple flow nozzle and calibrate it using a bucket and a timer. In use, I would like to minimize the amount of pressure drop that the flow nozzle introduces. I figure that after generating a flow curve for the nozzle it should be fairly accurate for my purposes. What I would like to know is, what dimensions of pipe, size of orifice, and location of pressure taps would give me the best results.

I am wanting to measure around 1 to 10 GPM of water within .1 GPM. The pipe size is 1" but I would like to increase the nozzle pipe size to something like 1.5" to reduce it's effect on the system.

Any help is appreciated.

RE: Suggestions for flow nozzle design please.

(OP)
I'm sorry, I said flow nozzle when I really should have just said orifice plate. I would also consider a venturi since I could make one of those as well.

RE: Suggestions for flow nozzle design please.

for 1" piping the cheapest and most accurate solution is a positive displacement meter especially for the range you indicate.



 

RE: Suggestions for flow nozzle design please.

or if you find a large rotameter, that will work as well  

RE: Suggestions for flow nozzle design please.

(OP)
Thanks. I looked into making a venturi and the throat diameter would have to be less than .5" to read 1 GPM. To read 10 GPM I would have a delta P of 9 psi. Boss just needs to spring for a real meter.

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