Recent content by downeast

Ha! Funny you should say this, and it did cross my mind. I haven't drilled any holes yet, and wanted to at least see bubble properties at a given diameter, depth and psi that will be close to actual. I plan on using the 0.7mm hole size in a short length of pipe in a garbage can of water...

Hi all, I just want to thank everyone for their tips and help with this, especially jrmichler who really pointed me in the right direction! I purchased all the fittings, check valves and rubber hose. I'll decide on pump, thermostat and pressure relief valve after piping is installed and I...

I was also thinking of a getting a "Sensitive Drill Feed" that would help while using a drill press or lathe. I was able to drill to 0.60 mm w/o braking bits, but something like this would definitely help. The other problem is my press RPM's is under 5K, not even close to the 30K normally used...

Sounds like a great way to not only customize or adjust later, but also avoid broken bits in the copper pipe at the same time. If you mess up a plug no big deal. However, certainly more labor. I wonder if a machine shop would prepare the plugs at a reasonable price. If so, could probably go to...

Hi, The tool doesn't allow setting downstream and upstream pressure to same value, however if I set them both to 0 initially, and then change only the primary from psig to psi abs, it automatically adds 1 atmosphere to the primary before I even click on Calculate. Then when I run, it still...

Thanks for the suggestion. I looked into what jrmichler was referring to with regards to changing orifice coefficient from the default of 0.7 to 0.6. It would clearly be the second one below: The -0.1 change in Cd made a significant difference with air flow calculation. I'm glad he...

Aha! I really appreciate you taking the time to explain in such detail! So my key takeaways are: Not only do I need enough pressure to get the air down to 3 ft, but I also need extra pressure to force the air through the holes and actually create bubbles, and a difference between primary and...

My current project involves constructing an air bubble system to protect stationary docks from ice heave or ice jacking during the winter months. Ice jacking is the vertical lift as ice expands. When this grabs piles supporting stationary docks, it can wreak havoc. I am mainly confused as to...

Excellent, thank you so much for taking the time to explain. Putting it that way it now makes sense to me.

Hi, and thanks for your input. Is it at least safe to say with the design on the left, the two opposing air flows might meet slightly closer to the inlet (bottom right of the loop), and with the design on the right, they would likely meet closer to the top left of the loop (opposite corner of...

Which compressed air inlet to a ring (loop) pipeline would likely be best in terms of least turbulance and best flow (avoiding dead head)? Given: 1) The inlet has to be in the corner of the rectangular loop. 2) Air consumption will be constant and evenly distributed throughout the loop. 3)...

My current project involves making an air bubble system to protect stationary docks from ice heave or ice jacking during the winter months. Ice jacking is the vertical lift as ice expands. When around piles supporting stationary docks, it can wreak havoc. This forum looks like a great place...