Oxygen tubing diameter

wardmiller · Post by **wardmiller** » Wed Oct 10, 2018 6:06 pm

I connect a 25 ft O2 tubing to my oxygen concentrator so I can walk around the room. The plastic tubing gets stiff over time and I must replace it. I never noticed before but the old tubing, measured by a ruler, was 3/16" OD and the new tubing is 5/32" OD. (I can't measure the ID.) I have the concentrator set for 3 l/m, as prescribed.

Does anyone here know what the ID would be and the formulas of the deliverable loss, if any. It seems like the force of the O2 coming out of the nasal canula is considerably less forceful than when using the larger tubing. My %SpO2 appears to be slightly less now.

I know I am worrying about a nit, but it does seem to make a difference.

palerider · Post by **palerider** » Wed Oct 10, 2018 6:12 pm

wardmiller wrote: ↑
Wed Oct 10, 2018 6:06 pm
It seems like the force of the O2 coming out of the nasal canula is considerably less forceful than when using the larger tubing. My %SpO2 appears to be slightly less now.

I know I am worrying about a nit, but it does seem to make a difference.

It doesn't matter. The only thing that matters is what the flowmeter says. If it says you're getting 3lpm, you're getting 3lpm, unless there's a leak.

chunkyfrog · Post by **chunkyfrog** » Wed Oct 10, 2018 6:28 pm

Most likely, the standard tubing has plenty of room for way higher flow.
3 is fairly modest.

Jas_williams · Post by **Jas_williams** » Thu Oct 11, 2018 12:53 am

It if the cross section changes you would still get your 3 L/m as that's the flow a smaller crossection would be at a higher pressure for the same flow rate

nobodythree · Post by **nobodythree** » Thu Sep 03, 2020 11:56 am

I disagree with the predecessors. The diameter of the line does have an impact.
The flowmeter is on the very inside of the oxygen generator. Unless you do have a flowmeter attached at the patient end - you do not know what the flow is.
The smaller diameter, the bigger friction - and that friction may not be small for the concentrator to overcome.
In an ideal world the compressor should overcome everything - but the measure is 3 liters in 1 minute. You might be getting 3 liters but not in 1 minute - and that is the problem.
We need cheap flowmeter and a pressure gauge to test the lines.

chunkyfrog · Post by **chunkyfrog** » Thu Sep 03, 2020 12:05 pm

The default diameter is sufficient, whatever the flow rate.
It's all done with ENGINEERING.
Measuring is done during manufacture.
Additional checking is unnecessary.
If not knowing bothers you, get yourself the proper devices, and DIY.
Maintenance is vital--and you are responsible to make sure it is done when needed.

Goofproof · Post by **Goofproof** » Thu Sep 03, 2020 1:32 pm

The dia of the outside of the tubung doesn't matter, it doesn't carry the flow, 2 inch OD won't carry more flow, it will be heavier to drag around. What ever the machine flow meter is set for is the flow going out, period, any leaks in the tubing will be a O2 lpm lpss, smashed or kinked hoses don't carry the full flow well. Get over it....

Get the Green O2 hose, It's stronger, lasts longer and is resistant to kinking. I've been using O2 fot 11 years, never had a hose wear out. Jim

If you want to play around and waste money, buy a tester to check the percent of O2 the machine is delivering, and clean the filters as needed.

Wulfman... · Post by **Wulfman...** » Thu Sep 03, 2020 3:50 pm

wardmiller wrote: ↑
Wed Oct 10, 2018 6:06 pm
I connect a 25 ft O2 tubing to my oxygen concentrator so I can walk around the room. The plastic tubing gets stiff over time and I must replace it. I never noticed before but the old tubing, measured by a ruler, was 3/16" OD and the new tubing is 5/32" OD. (I can't measure the ID.) I have the concentrator set for 3 l/m, as prescribed.

Does anyone here know what the ID would be and the formulas of the deliverable loss, if any. It seems like the force of the O2 coming out of the nasal canula is considerably less forceful than when using the larger tubing. My %SpO2 appears to be slightly less now.

I know I am worrying about a nit, but it does seem to make a difference.

Oxygen tubing IS oxygen tubing! No variations in inside or outside diameters. All are standard.

The only differences are the colors, lengths and whether or not they are advertised as "crush proof"......and price.

https://duckduckgo.com/?q=oxygen+concen ... fhp&ia=web

Den

.

palerider · Post by **palerider** » Thu Sep 03, 2020 7:33 pm

nobodythree wrote: ↑
Thu Sep 03, 2020 11:56 am
I disagree with the predecessors. The diameter of the line does have an impact.

Well, you're entitled to be wrong.

nobodythree wrote: ↑
Thu Sep 03, 2020 11:56 am
The flowmeter is on the very inside of the oxygen generator.

No, it's the very last thing before the outlet connector.

nobodythree wrote: ↑
Thu Sep 03, 2020 11:56 am
Unless you do have a flowmeter attached at the patient end - you do not know what the flow is.

Thus proving you have no knowledge whatsoever about how a flowmeter works, it measures the rate of whatever is flowing. Go to the end of a 50 foot oxygen hose, and put your finger over the end of it, the flowmeter will drop to zero.
You clearly know *NOTHING* about what you're babbling about, so stop.

nobodythree wrote: ↑
Thu Sep 03, 2020 11:56 am
We need cheap flowmeter and a pressure gauge to test the lines.

Again, no.

Go away.

zonker · Post by **zonker** » Thu Sep 03, 2020 7:43 pm

palerider wrote: ↑
Thu Sep 03, 2020 7:33 pm

nobodythree wrote: ↑
Thu Sep 03, 2020 11:56 am
I disagree with the predecessors. The diameter of the line does have an impact.
Well, you're entitled to be wrong.
nobodythree wrote: ↑
Thu Sep 03, 2020 11:56 am
The flowmeter is on the very inside of the oxygen generator.
No, it's the very last thing before the outlet connector.
nobodythree wrote: ↑
Thu Sep 03, 2020 11:56 am
Unless you do have a flowmeter attached at the patient end - you do not know what the flow is.
Thus proving you have no knowledge whatsoever about how a flowmeter works, it measures the rate of whatever is flowing. Go to the end of a 50 foot oxygen hose, and put your finger over the end of it, the flowmeter will drop to zero.
You clearly know *NOTHING* about what you're babbling about, so stop.
nobodythree wrote: ↑
Thu Sep 03, 2020 11:56 am
We need cheap flowmeter and a pressure gauge to test the lines.
Again, no.

Go away.

posting history shows TWO posts in one year's worth of time.

we aren't due to see him until next summer or fall.

palerider · Post by **palerider** » Thu Sep 03, 2020 7:57 pm

zonker wrote: ↑
Thu Sep 03, 2020 7:43 pm
posting history shows TWO posts in one year's worth of time.

we aren't due to see him until next summer or fall.

We should be so lucky.

chunkyfrog · Post by **chunkyfrog** » Thu Sep 03, 2020 9:43 pm

Ummm, maybe Mr Knowitall just got laid off, and has time on his hands.
Considering the attitude, I am surprised it wasn't much sooner.
Too bad we can't fire him, too.

Oxygen tubing diameter

Oxygen tubing diameter

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