Affordable Oxygen

...calibrated to deliver 15 -20 psig of dynamic pressure"

Any pressure regulator supplying a constant pressure...

There is definitely a potential surge problem there.

The EDS regulator is special in being designed to switch from no flow to lots and back while keeping the output pressure reasonable.

If you wish to gamble with yourself, then perhaps a surge tank after the regulator to improve the odds. A pulse-ox to keep an eye on the contraption might also be a good idea. But the words 'good idea' might not fit the situation?

On Thursday, January 23, 2020 at 6:15:07 AM UTC-7, wrote:
...calibrated to deliver 15 -20 psig of dynamic pressure"

Any pressure regulator supplying a constant pressure...

There is definitely a potential surge problem there.

The EDS regulator is special in being designed to switch from no flow to lots and back while keeping the output pressure reasonable.

If you wish to gamble with yourself, then perhaps a surge tank after the regulator to improve the odds. A pulse-ox to keep an eye on the contraption might also be a good idea. But the words 'good idea' might not fit the situation?

From what I'm reading, it seems most medical "yoke-style" (CGA870) regulators are rated more for gas FLOW, i.e. Liters per Minute, than for pressure, i.e. PSI. It is hard to find the PSI rating for these medical regulators, but one data point I found was that one was rated at 50psi, which is much higher than the EDS unit is designed to handle. It is the typical regulator where you can dial the FLOW from 0.5lpm to 15lpm. I realize that FLOW and PRESSURE are two completely different animals, but they are related and affect each other. Is there a way to set the FLOW rate to get the PSI at the desired 15-20psi? My gut tells me not really, but my physics is a bit rusty and can't prove it to myself.

John Foster wrote on 1/23/2020 8:40 AM:
On Thursday, January 23, 2020 at 6:15:07 AM UTC-7, wrote:
...calibrated to deliver 15 -20 psig of dynamic pressure"

Any pressure regulator supplying a constant pressure...

There is definitely a potential surge problem there.

The EDS regulator is special in being designed to switch from no flow to lots and back while keeping the output pressure reasonable.

If you wish to gamble with yourself, then perhaps a surge tank after the regulator to improve the odds. A pulse-ox to keep an eye on the contraption might also be a good idea. But the words 'good idea' might not fit the situation?

From what I'm reading, it seems most medical "yoke-style" (CGA870) regulators are rated more for gas FLOW, i.e. Liters per Minute, than for pressure, i.e. PSI. It is hard to find the PSI rating for these medical regulators, but one data point I found was that one was rated at 50psi, which is much higher than the EDS unit is designed to handle. It is the typical regulator where you can dial the FLOW from 0.5lpm to 15lpm. I realize that FLOW and PRESSURE are two completely different animals, but they are related and affect each other. Is there a way to set the FLOW rate to get the PSI at the desired 15-20psi? My gut tells me not really, but my physics is a bit rusty and can't prove it to myself.

I misunderstood you earlier: I thought you were considering a medical bottle with
an adapter that fits typical glider equipment, like an EDS regulator. The EDS
system is an important piece of safety equipment, so please do not try to save
money by substituting components UNLESS Mountain High approves of the substitution.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1

John
If you need O2 you need it to be reliable.
I personally would only use a MH regulator with a MH EDS.
I would also send that unit and regulator back to MH and have it checked out, they recommend doing that every so often.
When you go over 12-14k up to 18k you've got other things to worry about than a cobbled together O2 system.

On Thursday, January 23, 2020 at 9:40:13 AM UTC-7, John Foster wrote:
On Thursday, January 23, 2020 at 6:15:07 AM UTC-7, wrote:
...calibrated to deliver 15 -20 psig of dynamic pressure"

Any pressure regulator supplying a constant pressure...

There is definitely a potential surge problem there.

The EDS regulator is special in being designed to switch from no flow to lots and back while keeping the output pressure reasonable.

If you wish to gamble with yourself, then perhaps a surge tank after the regulator to improve the odds. A pulse-ox to keep an eye on the contraption might also be a good idea. But the words 'good idea' might not fit the situation?

From what I'm reading, it seems most medical "yoke-style" (CGA870) regulators are rated more for gas FLOW, i.e. Liters per Minute, than for pressure, i.e. PSI. It is hard to find the PSI rating for these medical regulators, but one data point I found was that one was rated at 50psi, which is much higher than the EDS unit is designed to handle. It is the typical regulator where you can dial the FLOW from 0.5lpm to 15lpm. I realize that FLOW and PRESSURE are two completely different animals, but they are related and affect each other. Is there a way to set the FLOW rate to get the PSI at the desired 15-20psi? My gut tells me not really, but my physics is a bit rusty and can't prove it to myself.

Upon further research, it appears that medical oxygen is standardized at 50psi, both from the portable oxygen tanks, and from the wall outlets in hospitals. This would not work to use a medical oxygen regulator and just "dial it down", as the pauses between breaths, the reduced flow at low altitudes, would cause the pressure to rise between the primary regulator (50psi) and the EDS unit (15-20psi). You would need a secondary regulator between them to step the pressure down to 15-20psi, or you would damage your EDS unit.

On Friday, January 24, 2020 at 10:00:09 AM UTC-8, John Foster wrote:
On Thursday, January 23, 2020 at 9:40:13 AM UTC-7, John Foster wrote:
On Thursday, January 23, 2020 at 6:15:07 AM UTC-7, wrote:
...calibrated to deliver 15 -20 psig of dynamic pressure"

Any pressure regulator supplying a constant pressure...

There is definitely a potential surge problem there.

The EDS regulator is special in being designed to switch from no flow to lots and back while keeping the output pressure reasonable.

If you wish to gamble with yourself, then perhaps a surge tank after the regulator to improve the odds. A pulse-ox to keep an eye on the contraption might also be a good idea. But the words 'good idea' might not fit the situation?

From what I'm reading, it seems most medical "yoke-style" (CGA870) regulators are rated more for gas FLOW, i.e. Liters per Minute, than for pressure, i.e. PSI. It is hard to find the PSI rating for these medical regulators, but one data point I found was that one was rated at 50psi, which is much higher than the EDS unit is designed to handle. It is the typical regulator where you can dial the FLOW from 0.5lpm to 15lpm. I realize that FLOW and PRESSURE are two completely different animals, but they are related and affect each other. Is there a way to set the FLOW rate to get the PSI at the desired 15-20psi? My gut tells me not really, but my physics is a bit rusty and can't prove it to myself.

Upon further research, it appears that medical oxygen is standardized at 50psi, both from the portable oxygen tanks, and from the wall outlets in hospitals. This would not work to use a medical oxygen regulator and just "dial it down", as the pauses between breaths, the reduced flow at low altitudes, would cause the pressure to rise between the primary regulator (50psi) and the EDS unit (15-20psi). You would need a secondary regulator between them to step the pressure down to 15-20psi, or you would damage your EDS unit.

Using medical O2 for aviation is akin to using a vet for your health care, wrong application. The vet might just shoot you for a broken leg.

The vets my wife and I deal with are better doctors than the doctors we deal with.

Using medical O2 for aviation is akin to using a vet for your health care, wrong application. The vet might just shoot you for a broken leg.

There is absolutely NO DIFFERENCE between medical, aviators or welding oxygen. Moisture may be introduced at the delivery device for medical applications, but in the cylinder itself, they are all 99.99% O2. Any moisture in the pressurized cylinder, in the presence of an oxidizer (O2, get it?) promotes corrosion of the aluminum or steel cylinder.

I wonder how long this fairy tale about the "differences" in oxygen will survive?

On Friday, January 24, 2020 at 12:44:33 PM UTC-8, Jonathan St. Cloud wrote:

Using medical O2 for aviation...

I thought we settled this twenty years ago.

https://www.avweb.com/features/pelic...elders-oxygen/

Medical, welding, and aviator's breathing oxygen are all produced using the same processes and equipment. Not just similar. They're all the exact same stuff from the same tap.

The only differences are what they're dispensed into and how they're used. The requirements for purity and cleanliness in all compressed oxygen applications are such that the baseline specifications for all are the same.

--Bob K.

Mark, if you say something is different and special you can charge more.
Marketing basics.



At 22:21 24 January 2020, Bob Kuykendall wrote:
On Friday, January 24, 2020 at 12:44:33 PM UTC-8, Jonathan St. Cloud
wrote:

Using medical O2 for aviation...

I thought we settled this twenty years ago.

https://www.avweb.com/features/pelic...tting-high-on-
welders-oxygen/

Medical, welding, and aviator's breathing oxygen are all produced using
the
same processes and equipment. Not just similar. They're all the exact
same
stuff from the same tap.

The only differences are what they're dispensed into and how they're
used.
The requirements for purity and cleanliness in all compressed oxygen
applications are such that the baseline specifications for all are the
same.

--Bob K.