The end product is I strap a S&W 586 or a Ruger sp101 to it.

[Captain America]

I need answers from people that know about air volume. That does not include my best beer fanny burp stories. I need people learned in science, math, algebra, and other numbery stuff.
Someone from my cpap people was supposed to get back to me with an answer but that is not happening.
When they did my sleep study it was done using a 6 ft long hose with a 3/4" id hose. So the machine was calibrated using this hose. Let's say a setting of ten got the results they wanted.
Remember, the whole idea is to create enough pressure that it keeps my throat from closing so it needs a constant pressure. Let's say it is 15.
My question is this, If my throat needs a constant pressure of 15 to keep me alive and I want to lengthing the hose to 12 feet do I need to increase the volume on the machine to maintain the constant. I think I need a flow meter???
I will show you how I strap a gun to it when I get answers...It is gonna be sweet. I can imagine a bad guy telling the police. I went into this room with lots of lighted up machines and this sleeping guy became a hanged guy with hoses coming out of his head in all directions started shooting me.

[mescalero1]

Yes, you need a flow meter.
Yes, you need to increase the flow on the machine.
Increase of hose diameter is desirable, if practical.

[Andrew]

I think your question has more to do with where the extra pressure is bled off of the line. I am assuming that since it is a constant pressure that is has a place it bleeds off to keep from pumping you up like the Goodyear blimp. Remember, no pump ever built or concieved has ever or will ever make pressure, only flow. Resistance to flow is what creates the pressure.

Given the exhaust point is the same you would be more likely see twice the time to come up to pressure and longer to relief it because of doubling the capacity of the line but not so much of a pressure drop.

Please, do much reasearch and ask many knowledgeable people before doing the conversion. Saftey first.

[O.S.O.K.]

Wouldn't you want to maintain the volume of the hose? That would require halving the id of the hose since he's doubling the length.

That's what makes sense to me anyway.

[Captain America]

I think your question has more to do with where the extra pressure is bled off of the line. I am assuming that since it is a constant pressure that is has a place it bleeds off to keep from pumping you up like the Goodyear blimp. Remember, no pump ever built or concieved has ever or will ever make pressure, only flow. Resistance to flow is what creates the pressure.

Given the exhaust point is the same you would be more likely see twice the time to come up to pressure and longer to relief it because of doubling the capacity of the line but not so much of a pressure drop.

Please, do much reasearch and ask many knowledgeable people before doing the conversion. Saftey first.

I get it. I have forgotten so much. I know what I am doing now. Believe it or not I used to work with steam pipes..... I told you that you people were geniuses.

[Travis Morgan]

Wouldn't you want to maintain the volume of the hose? That would require halving the id of the hose since he's doubling the length.

That's what makes sense to me anyway.

BUT, that would decrease the volume of air delivered.

[dave in maine]

i think you will end up rebreathing your old breath and could end up with drain bammage.i'd rethink this if i were you.

[Leverdude]

I'd think as long as the hose was the same dia its length wouldn't effect the volume coming out the end. If you extend it with a smaller tube you'll increase the pressure but drop volume, if you extend it with a bigger hose you'll lose pressure but I imagine the volume would remain constant.
but I also think you ought to ask someone who knows something about it. Its your life.

[Hobie]

WHY do you NEED to lengthen the hose to 12 feet? If you do, the CPAP people should do the calculation.

[kimwcook]

I would think the provider of the C-PAP would already crossed this bridge a long time ago and would have a ready answer.

[rjohns94]

The forumla that governs this I think are:

P1 * V1 P2 *V2
T1 = T2


Where P1 is the initial Pressure, V1 is the intial Volume And T1 is the initial Temp.

P2 is the final pressure desired, V2 is the final Volume and T2 is the final Temp.


Assume the temps dont change so they cancel

Subbing V2 = 2*V1 leaves

P1*V1 = P2*2*V1

This leaves P1=2*P2

[JReed]

Wouldn't you want to maintain the volume of the hose? That would require halving the id of the hose since he's doubling the length.

That's what makes sense to me anyway.

Yep to maintain line pressure you need to decrees the ID so that the volume of the hose stays the same. A fire hose 10 feet long hooked up to your house will just trickel a standard garden hose the same length will put out a decent flow.

[mescalero1]

Air flow

[Bear 45/70]

You guys need to remember that the pressure regulator is in the mask on his face, also the exhaust for all the air is there too. Making the hose smaller will reduce the volume and volume is what a C-PAP is all about, you have to fill the lungs. I had to extend my hose by 3 feet to install a water trap. The tech sent me these items and said to just add them to old hose. The change would be negligible. I think the only viable way to know if the machine needs adjustment or not for a hose length being doubled is to talk to a tech.

[brucew44guns]

If memory serves me, my tech guy "set" the cpap machine when I went in to get it, and informed me that if it needed "resetting" it would have to be brought in. It has remained set the same for about 3 or 4 years I've had it, not sure if you could do it yourself or not. You must have a logistics problem, machine too far from the bedside?

[JReed]

You guys need to remember that the pressure regulator is in the mask on his face, also the exhaust for all the air is there too. Making the hose smaller will reduce the volume and volume is what a C-PAP is all about, you have to fill the lungs. I had to extend my hose by 3 feet to install a water trap. The tech sent me these items and said to just add them to old hose. The change would be negligible. I think the only viable way to know if the machine needs adjustment or not for a hose length being doubled is to talk to a tech.

AH didn't know it was on the mask. In that case you are right any change would be minimal if any.

[Rusty]

With a 12' hose I think the biggest problem you'll have is keeping the kinks out of the hose. I have problems with mine, as issued at times.

[Travis Morgan]

You guys need to remember that the pressure regulator is in the mask on his face, also the exhaust for all the air is there too. Making the hose smaller will reduce the volume and volume is what a C-PAP is all about, you have to fill the lungs. I had to extend my hose by 3 feet to install a water trap. The tech sent me these items and said to just add them to old hose. The change would be negligible. I think the only viable way to know if the machine needs adjustment or not for a hose length being doubled is to talk to a tech.

AH didn't know it was on the mask. In that case you are right any change would be minimal if any.

I should hope he's not taking it rectally!

[awp101]

You guys need to remember that the pressure regulator is in the mask on his face, also the exhaust for all the air is there too. Making the hose smaller will reduce the volume and volume is what a C-PAP is all about, you have to fill the lungs. I had to extend my hose by 3 feet to install a water trap. The tech sent me these items and said to just add them to old hose. The change would be negligible. I think the only viable way to know if the machine needs adjustment or not for a hose length being doubled is to talk to a tech.

AH didn't know it was on the mask. In that case you are right any change would be minimal if any.

I should hope he's not taking it rectally!

Would that make it a C-RAP machine?