Restrictive Venturi - Anyone have information about these?

[joedirt9]

Need to design a restrictive venture, regular orifice wont work as there are solids. Does anyone have a way to calculate the dimensions? I am unable to find any equations
THanks

 

[Latexman]

If all you want to do is lower the pressure, reduce to a smaller pipe size for the calculated length to do the job.

Venturi's are great at pressure recovery; not so good as restrictions (for the money). Folks normally use them to induce another stream into the main stream.

At least that's my experience.

Good luck,
Latexman

 

[zdas04]

You are more likely to get meaningful help if you provide some details. What is the fluid? What is the flow rate, pressure, and temperature? What is the pipe size?

David

 

[ione]

Are you looking for something capable to measure the flow rate of an abrasive liquid? I mean a liquid with solid particles suspended in? If so why not use a magnetic flow meter?

 

[joedirt9]

This will be used on a continious circulation line. An orifice is not an option as the fluid is a slurry. THis will not be used to measure the flow rate. This will be a 1.5" line with a venturi inserted to keep the flow rate below 75GPM. The plant has used them before but the person that installed them is not around and I have been unable to find any of his calculations.
I would like to be able to build one and then use the calculations to figure out what pressure drop is caused by that particular design.
Thanks

 

[Latexman]

Just use smaller pipe.

Good luck,
Latexman

 

[joedirt9]

smaller pipe is not an option for this area. not a bad idea though.

 

[MJCronin]

To continue this fascinating guessing game....

By "a regular orifice wont work as there are solids" do you mean the orifice is unacceptable because it will wear too quickly, OR do you mean that the regular orifice will clog ?

If you are concerned about accelerated wear, you might consider a ceramic orifice.

Otherwise, all of the solutions proposed above will eventually clog

 

[Latexman]

How about a flow nozzle? That'd be less expensive than a venturi, it's compact, and it would not be prone to clogging.


Good luck,
Latexman