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Unwanted bubbles in the system! 3

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xhuydo

Mechanical
Jan 18, 2017
7
Thank you for taking the time and reading my post. I very much appreciate your help.

I am getting bubbles into my pipe system and wanted to know how they are forming and what I can do to remediate.

The flow begins at the a reservoir holding water that is open to the atmosphere. Water flows from the bottom via a gated valve and into a centrifugal pump. The flow is directed up and then down. The flow passes turbine flow meter, pressure gauge, and exits from an acrylic nozzle. The plumbing consist of 3/4" ID plastic tubing, and 1" ID PVC. The nozzle has a 1/5" square exit. The nozzle attaches by a mount. The mount screws onto a threaded PVC adapter and then nozzle is essentially clamped on.

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IMG_1142_np04yy.jpg


At 8 liters per minute(lpm), I am observing small bubbles around the PVC adapter and acrylic nozzle connection. Then as I increase the flow rate up to approximately 9 lpm a large bubble (approximately 1") forms.

My initial guess is that I have air leak in the nozzle mount and nozzle area. I placed an o-ring in between the nozzle and the nozzle mount but the issue still persist.

I apologize for such a long post. I tried to be as descriptive as possible. Please let me know if I need to clarify anything.
 
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Glad we could help - A picture of the new arrangement would be nice to close out the post and show anyone else what to do.

LI

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
 
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