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roster · Post by **roster** » Thu Apr 21, 2011 7:35 pm

That is not an uncommon setup. I have a friend who uses oxygen and CPAP (BIPAP) and his oxygen supply hose is about 35 feet long. He keeps the concentrator in an adjacent room to avoid noise and heat in his bedroom.

I am assume you have an adapter between the CPAP machine and CPAP hose into which the oxygen tube fits. It can be a problem if the oxygen hose is attached directly to the CPAP mask.

scrapper · Post by **scrapper** » Thu Apr 21, 2011 7:37 pm

If the providers did not believe that the oxygen was going to be adequate at the mask, do you really think it would have come with 50' of tubing?

The long tubing allows people on continuous oxygen 24 hours a day maximum freedom in their homes, without disconnecting the life line.

lars4life · Post by **lars4life** » Thu Apr 21, 2011 7:41 pm

roster · Post by **roster** » Thu Apr 21, 2011 7:45 pm

lars4life wrote:The 50 ft hose connects from the oxygen concentrator to the outlet of the humidifier. I guess from the replies so far
that this is OK?

That's good.

scrapper wrote:If the providers did not believe that the oxygen was going to be adequate at the mask, do you really think it would have come with 50' of tubing?

scrapper, Since when did you gain confidence in DMEs?

Slinky · Post by **Slinky** » Thu Apr 21, 2011 8:01 pm

Lars, I take it you only use the 02 w/your PAP at night?? Those concentrators can be noisy - and they can throw quite a bit of heat. I have mine sitting in the 'puter room. Hubby drilled a small hole in the wall just above the baseboard and ran the 25' tubing thru the hole to my PAP. I have hardwood floors so we also have the concentrator sitting on a carpet square.

lars4life · Post by **lars4life** » Thu Apr 21, 2011 8:50 pm

archangle · Post by **archangle** » Thu Apr 21, 2011 9:16 pm

Don't forget that the oxygen in the output of the O2 concentrator is 4 or 5 times more concentrated than the O2 in air. Plus you don't get 100% oxygen in the air your breathe in from the CPAP+oxygen mask, so the flow through the O2 tubing is much less than the flow through the CPAP hose. The pressure in the O2 line is also higher than the pressure in the CPAP hose, so more flow can happen due to the pressure.

lars4life · Post by **lars4life** » Thu Apr 21, 2011 9:24 pm

Slinky · Post by **Slinky** » Thu Apr 21, 2011 9:26 pm

archangle wrote:... so the flow through the O2 tubing is much less than the flow through the CPAP hose. The pressure in the O2 line is also higher than the pressure in the CPAP hose, so more flow can happen due to the pressure.

Say what?? Pressure in the 02 line is higher than the pressure in the CPAP hose???? I don't think so! Is there a typo?

Lars, the 02 from the concentrator is concentrated room air, i.e. there is a higher concentration of 02 from the concentrator than is in room air.

lars4life · Post by **lars4life** » Thu Apr 21, 2011 9:33 pm

Slinky · Post by **Slinky** » Thu Apr 21, 2011 9:39 pm

Yup, yup. That's what I was trying to say.

If you hold your mask to your face w/o turning your PAP on you will BARELY feel the 02 coming thru. But you will feel it.

archangle · Post by **archangle** » Thu Apr 21, 2011 10:56 pm

lars4life wrote:archangle...what the heck are you talking about? You said a bunch of stuff, but I did not understand it.
Oxygen is x times > than surrounding air? what else did you say? Explain in baby talk. What is the significance of
all that you said? Spill the beans plainly.

Seems pretty clear to me.

Pure (or nearly pure) O2 comes from the oxygen concentrator. Normal air only has 21% oxygen. You don't need nearly as much volume from the pure O2 as you do for the normal air coming out of the CPAP machine. Because of the smaller flow rate, you can use a longer and thinner hose for O2 vs. air.

Most of the gas you breathe through a CPAP+O2 setup comes from the CPAP machine, not the O2 concentrator. Once again, lower flow rate means a thinner and longer hose will work.

Oxygen concentrators tend to put out around 5 PSI of pressure. That is 350 cmH2O. The higher pressure of the O2 can overcome pressure drop in the the O2 line a lot better than the roughly 20 cmH20 in the CPAP hose. Once again, the O2 hose can be longer and thinner than the CPAP hose.

You can even throw in another reason the CPAP hose needs to be bigger. The CPAP machine needs to sense the pressure at the mask. If there's too much drag in the CPAP hose, it will sense the wrong pressure and not provide the correct pressure at the mask. The O2 concentrator doesn't need to control the pressure at the other end of the hose as precisely as the CPAP machine does.

archangle · Post by **archangle** » Thu Apr 21, 2011 11:01 pm

Slinky wrote:
archangle wrote:... so the flow through the O2 tubing is much less than the flow through the CPAP hose. The pressure in the O2 line is also higher than the pressure in the CPAP hose, so more flow can happen due to the pressure.
Say what?? Pressure in the 02 line is higher than the pressure in the CPAP hose???? I don't think so! Is there a typo?

O2 concentrators tend to put out around 5 PSI. For instance, see http://www.homeoxygenconcentrator.com/.

5 PSI is 350 cmH20. Roughly 20x the pressure in most CPAP hoes.

Slinky · Post by **Slinky** » Fri Apr 22, 2011 2:07 am

Well, it sure doesn't FEEL like it!!!

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