Micro bore hose volume.

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I'll bet that you could put a dead head on the end of that 5 ft hose ... pressurize it from the tank ... and then expel the air from the hose for days before you would be able to get your 4500 psi fill down to 3000 psi ... The correct answer to your question is they don't hold much air, that's why they are called micro bore 👈👉👇👆 😂

I know your situation, I have the same problem of overthinking a lot of things. I need to stop imagining scenarios in my head that have a -2% chance of making any difference whatsoever. The trouble is that then ... I start thinking that it is possible that there could be a +2% chance of it making a difference in a parallel universe somewhere. 

My therapist says I overthink too much ... which gives me a lot to think about 💥

Shalom

John
 
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Situations are different. I cascade 2 larger scba tanks. Each has a 5 foot hose plus the connector's 2 foot hose. I bleed off 12+ feet of microbore hose at tank pressure each time I fill even the smallest gun. I'm sure it adds up. But, I fill my own tanks once down to about 2300psi and it only takes 3-4 min to get both back up to 4500psi. Compressor is 10 years old and has 25 hours of run time on it but I've avoided several hundred trips to the scuba shop (and a 1-3 day wait and the trip back to pick it up) AND I get full fills, I spend money on a lot of stupid stuff for this hobby but while much shorter custom hoses make perfect sense for my case, they are one thing I really can't justifying a couple hundred dollars for. 

Yo, I don't think gas pump hose work that way. I shake mine to help avoid dripping gas on the paint.
 
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Yeah Likkity, I got you! What always gets me thinking is when I purge the air in the line, it seems like it takes 4-5 seconds to empty. If I fill my gun and then both of my boy’s guns, and purge the line 3 times, am I wasting .5 bar, 1 bar, 2 bar, 5 bars? With my Impact I’ve got it tuned to get 1 shot per 1.7bar or so. I think of how many shots I’m losing. I have a 1ft. micro bore hose but it leaks. I’m just wondering if I should swap my 5 footer for a short hose and, I’d just like to know.

JCD, it’s not the money, I live 25 minutes from town and like to conserve where I can. I do have a 3000psi scuba tank too. I think I’m going to cascade more often. With three of us shooting we go through air like crazy. I know I need a compressor but Im so leery, it seems like every day I hear of another one breaking down. And...I just spent a lot of my gun savings on a new gun for my son. I’m starting over, saving for a Red Wolf so I don’t want to spend $$$ on a compressor. I want my first Daystate!

Stoti
 
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I'll have to get back to you on this later my friend, I'm in my car and all of a sudden my car horn goes off accidentally and it's stuck ... trouble is I'm following a group of Hell's Angels on the freeway ... they don't look like happy campers ... giving me the one fingered salute ... whoops ... a baseball bat ... gotta go ... good luck 😲

Shalom
 
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Situations are different. I cascade 2 larger scba tanks. Each has a 5 foot hose plus the connector's 2 foot hose. I bleed off 12+ feet of microbore hose at tank pressure each time I fill even the smallest gun. I'm sure it adds up. But, I fill my own tanks once down to about 2300psi and it only takes 3-4 min to get both back up to 4500psi. Compressor is 10 years old and has 25 hours of run time on it but I've avoided several hundred trips to the scuba shop (and a 1-3 day wait and the trip back to pick it up) AND I get full fills, I spend money on a lot of stupid stuff for this hobby but while much shorter custom hoses make perfect sense for my case, they are one thing I really can't justifying a couple hundred dollars for. 

Yo, I don't think gas pump hose work that way. I shake mine to help avoid dripping gas on the paint.
Click to expand...

I know that! Tell that to all the idiots that make me wait in the bumper to bumper lines at the pumps!!!
 
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Interesting conversation as I can tell I lose air each time I fill and bleed. But is it significant? Only way is to determine the volume of the hose. I got the internal diameter spec of the microbore off expertHPA of 0.070" = 0.1778 cm. 

Volume = Length x Pi(D/2)^2, assume a 40" hose

V = 101.6cm x Pi(0.1778 / 2)^2 = ~2.5 cc

Add some extra cc for the fittings and the fill valve and you could be wasting ~5cc of air with each fill. Is this statistically relevant? Depends on the size of the airguns air tank, right? If you have a huge 580cc bottle, then 5 cc wasted per fill is not much of a deal. But if you have something like a PCP pistol with a 40-50cc tank, or if you have a small Guppy size fill bottle, each lost 5cc becomes more relevant. 

What can you do though - it's probably one of the more minimal losses to be concerned about. You also have loss of pressure to heat when you fill the bottle, you have losses to heat again when you fill the airgun tank, you have losses to cool down while shooting if you use air too fast, then you have the efficiency of your airgun and the efficiency of your tune. And forget about air consumption while you're tuning - that can be a full tank by itself. 
 
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Thanks brotha, that’s exactly what I was looking for! I do have a 580cc bottle, one of my sons has a 480cc bottle and the other a 290cc cylinder. I’ve just been thinking about switching out the long micro bore for a shorter version. I need a compressor but it’s going to have to wait until after I buy a Red Wolf! 

Thanks again. Stoti
 
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Stoti, I don’t have the mathematical solution, but I think I know where you’re going with this(I think). On my Airhog tank that was bought in kit form, it came with a 5’ whip, with an exterior blue armor shield. When tuning my Marauder years ago I found myself having to go get it topped off twice a week. There had to be a better way, as I knew I was losing a lot of air during the bleed off.

Then I discovered the Regman tethering regulator from airtanksplus.com He’s local to us(more so to me, as he’s in Sacramento) so I drove over to Gene Webber’s(one of two owners) place to check it out. Great guy, btw.

Shooting tethered, wether while target shooting or adjusting for velocity over a chronograph, I find my tanks air lasts longer between fills. Cool thing also, when shooting my hatsan hercules Bully which is a non regulated gun with a max fill of 3,650 psi, i was able to adjust the Regman to find its sweet spot of air pressure and accuracy, which was at 3200 psi. 

Some folks try the method of shooting tethered to their tank by just closing off the tanks valve, and checking on the guns pressure gage after every so many shots, then cracking the valve open to re top off their gun. That’s an ok method I guess, but with the Regman it’s worry free and no head bopping to check the guns gage constantly. A cool feature about the Regman, also, is with the appropriate tees and misc fittings, you and your two shooting partners can shoot tethered all together to the one tank(provided you all have guns that shoot at about or close to the same pressures), and the only air you’ll waste is the bleed off at the end of the shooting session. Try shooting with two shooters tethered to the tank where you close off the tanks valve, and see how that goes.

Every once in awhile a topic on the forums comes up, where it’s asked what the best tool or piece of gear is had by an airgunner, and my Regman is always posted up. It truly is the best investment of a tool that I’ve made to add to all my gear. 



https://airtanksplus.com/product/regman2-external-pcp-airgun-regulator/



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