Perfect, thanks everyone!
But one last thing: Is there somewhere online that will show me/help me to do these calculations? I don't know how you ended up with 100 psig, and I can't keep coming back here with different lengths and diameters!
...well I could, but I'm sure it wouldn't be appreciated.
Thanks Katmar, and everyone else here!
The hose I will use is rated to 650 psig working pressure, so I should be able to get the flow I need no problem.
I'll have to contact them to get the surface roughness, I haven't seen it listed in their catalogs...
But I see a few people saying 100 psig for 0.38" ID. That sounds like a good start, and I can always increase the pressure as needed.
I've found a 0.38" ID hose with 650 psig working pressure weighing 0.09 lb/ft. As long as the pressure I need is less than 650 psig, then I can adjust the pressure at the regulator until I get the flow I need. I'm not worried about ice buildup at the moment.
There's also 1/2" ID with 450 psig...
@Stanier: Thanks for the link, I didn't even think of downloading demos.
@Latexman: From helium tanks, 3000 - 5000 psi. Not sure exactly, we don't have them yet. Then going through shutoff and a pressure regular to bring it down to the desired psi. I don't know what temperature the helium will...
Ah ha! I knew I was wrong. That's why I came looking for help.
The system is to top-up helium levels in a balloon - so the flow rate doesn't have to be exact or perfectly steady, just higher flows = less down time. And weight is a large factor.
The exit is approximately standard conditions...
I'm no expert at compressible fluid systems, but I ended up being the one to design it...
I'm having trouble calculating the required pressure to get the desired volume flow rate (at outlet conditions).
The system must feed helium vertically through 3/8" ID, 112 ft long tubing (ID can vary, I...
