|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

06-22-2017, 12:29 PM
|
 |
|
|
Join Date: Oct 2007
Location: In New Braunfels, ist das Leben schön!
Posts: 871
|
|
Quote:
Originally Posted by climberrn
Would sure be nice if there was a location we could post a list of cheap O2 refills across the country.
|
Great idea. My son and I are planning a long trip around the country next spring and would love to have a list of good oxygen refill locations like the RV Hotel or Courtesy Car list.
I'll go first: I have a trans-fill setup at KBAZ New Braunfels in my hanger. Set up for the standard CGA 540 fitting like on my Aerox bottle. Drop me an email and if I'm in town, I can meet a fellow RVer and help fill your aviation bottle for a donation ($10?).
__________________
Larry New
RV-7A - Built, flying 900+ hrs
RV-10 - Built, flying 2.9 hrs
??? - RV-12, Subsonex
48 States in 7 Days!
VAF Paid - Annual Autodraft
|

06-22-2017, 03:10 PM
|
 |
|
|
Join Date: Nov 2013
Location: Prescott, AZ
Posts: 1,614
|
|
I would sign up on a list where RVers could arrange a free fill at my hangar...
__________________
"Kindness is never a bad plan."
exemption option waived. Donation appropriate.
|

06-22-2017, 11:01 PM
|
|
|
|
Join Date: Feb 2007
Location: Bakersfield, CA
Posts: 214
|
|
Quote:
Originally Posted by climberrn
Would sure be nice if there was a location we could post a list of cheap O2 refills across the country. Anyone at CXP and we are home, shoot me a message if you want a fill.
|
This is an excellent idea!
__________________
Bruce Peters
Bakersfield, CA
RV-9A, Flying 11/21/15
VAF#1145
Donation up to date 08/20
|

06-23-2017, 06:36 AM
|
|
|
|
Join Date: Oct 2012
Location: Corona , Ca
Posts: 139
|
|
weld tank to Areox bottle
Read a lot on forum and probable listed somewhere. Prefer hose and fitting as an assemble but sure I can put items together. I've seen what I think I need but big money / small wallet.
__________________
RVTOY
RV7A flying
Kitfox 7 completed 2009. Lost in 2010 KJOA Flood. New Airworthiness cert. 6/8/2018
Always an upgrade in progress.
Donated to keep forum alive.
|

06-23-2017, 10:20 AM
|
 |
|
|
Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
|
|
Cascade system for Dummies (aka me!)
After reading through this and other threads on O2, I'm not finding the details I'm looking for (or simply don't understand what I'm reading). So for the sake of argument if I wanted to build a 2-tank cascade refill system, what would I specifically ask for at my local welding supply shop with regards to the tanks and refills?
-- What size tanks?
-- Do you sign up for some kind of O2 service for refilling?
-- Is it better to buy or rent the tanks and does that have an impact on getting them refilled?
Oh and is there anything I shouldn't do like say to the welding folks "Oh I don't want to weld, I need the tanks so I can refill my aviation O2 bottle", or something to that effect?
I realize that I'd also need a transfill and an intercoupling kit but those parts seems pretty straightforward.
__________________
Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
Last edited by Auburntsts : 06-23-2017 at 10:33 AM.
|

06-23-2017, 12:46 PM
|
 |
|
|
Join Date: Nov 2013
Location: Prescott, AZ
Posts: 1,614
|
|
Todd, I am not sure if I would bother to cascade. A large single bottle... will refill the flying bottle many many times. It may not be up to full capacity after a while.... but it usually lasts a long time. Easy fills right at your hangar make it convenient and inexpensive. I purchased a really large bottle of oxygen and then took it to the welding shop. They just exchanged for a full one and noted in my account that it is not a rental tank.
__________________
"Kindness is never a bad plan."
exemption option waived. Donation appropriate.
|

06-23-2017, 04:51 PM
|
|
|
|
Join Date: Sep 2007
Location: Central IL
Posts: 5,516
|
|
Quote:
Originally Posted by Auburntsts
After reading through this and other threads on O2, I'm not finding the details I'm looking for (or simply don't understand what I'm reading). So for the sake of argument if I wanted to build a 2-tank cascade refill system, what would I specifically ask for at my local welding supply shop with regards to the tanks and refills?
-- What size tanks?
-- Do you sign up for some kind of O2 service for refilling?
-- Is it better to buy or rent the tanks and does that have an impact on getting them refilled?
Oh and is there anything I shouldn't do like say to the welding folks "Oh I don't want to weld, I need the tanks so I can refill my aviation O2 bottle", or something to that effect?
I realize that I'd also need a transfill and an intercoupling kit but those parts seems pretty straightforward.
|
Just locate your local welding gas supplier and ask about a K tank (249 ft3, 2200 psi) and a 4K tank - (500 ft3 , 4500 psi) rental prices. The 4k is being promoted to save tank storage, so might be attractively priced. Start asking for parts for a transfil and they might get spooky - esp with 4500 psi. Dangerous stuff under pressure and easy to be ignorant of hazards. One might use a regulator to limit the filled unit to 2100-2200 psi just to be safe. More $$$. Buying a used tank might be ok, but here a K is $30/yr with $150 deposit.
Assembly cleanliness, lubes, leaks etc would concern a vendor as they might be concerned about liability by just selling parts to a novice. They might give you some training and then sell an assembled unit, though. They are just trying to stay in business and keep people alive. They really want to sell gasses and be helpful.
Surprised an Auburn guy doesn't know this stuff.
Oh - I mentioned that a full K tank filling a JD (21 ft3) flight tank can refill it 5 times from 300 psi before dropping below 1500 psi on both. That is 72% of capacity in terms of moles and hours at chosen altitude. That is 4X the rated tank flight hours.
I have not done numbers for a 4K tank. A little more complicated for the calculations.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
Last edited by BillL : 06-23-2017 at 04:58 PM.
|

06-23-2017, 05:01 PM
|
|
|
|
Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,958
|
|
Quote:
Originally Posted by larrynew
Great idea. My son and I are planning a long trip around the country next spring and would love to have a list of good oxygen refill locations like the RV Hotel or Courtesy Car list.
I'll go first: I have a trans-fill setup at KBAZ New Braunfels in my hanger. Set up for the standard CGA 540 fitting like on my Aerox bottle. Drop me an email and if I'm in town, I can meet a fellow RVer and help fill your aviation bottle for a donation ($10?).
|
I'm in. I have a transfill setup in my hangar at 3AU, Augusta KS, right outside Wichita. Stop in anywhere in the Wichita area for a free RV hotel, free dinner, free beer, and free O2 fill (CGA-540). Unfortunately no hangar space, but tie downs are free or nearly so.
Wait, do I hear Vlad's plane starting up? 
__________________
Kurt W.
RV9A
FLYING!!!
|

06-23-2017, 05:25 PM
|
 |
|
|
Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
|
|
Quote:
Originally Posted by BillL
Just locate your local welding gas supplier and ask about a K tank (249 ft3, 2200 psi) and a 4K tank - (500 ft3 , 4500 psi) rental prices. The 4k is being promoted to save tank storage, so might be attractively priced. Start asking for parts for a transfil and they might get spooky - esp with 4500 psi. Dangerous stuff under pressure and easy to be ignorant of hazards. One might use a regulator to limit the filled unit to 2100-2200 psi just to be safe. More $$$. Buying a used tank might be ok, but here a K is $30/yr with $150 deposit.
Assembly cleanliness, lubes, leaks etc would concern a vendor as they might be concerned about liability by just selling parts to a novice. They might give you some training and then sell an assembled unit, though. They are just trying to stay in business and keep people alive. They really want to sell gasses and be helpful.
Surprised an Auburn guy doesn't know this stuff.
Oh - I mentioned that a full K tank filling a JD (21 ft3) flight tank can refill it 5 times from 300 psi before dropping below 1500 psi on both. That is 72% of capacity in terms of moles and hours at chosen altitude. That is 4X the rated tank flight hours.
I have not done numbers for a 4K tank. A little more complicated for the calculations.
|
HA! Thank's for the info--yep Auburn didn't prepare me very well for welding systems but I'm pretty well versed on low pressure fluid storage and delivery systems (mainly in the 7 to 15.5 gal range).  Hey maybe that's why I don't know this stuff.....
As an aside, oddly enough I'm quite familiar with the dangers associated with high pressure air (3000+ PSI). Back in the day I was an ICBM launch officer and our launch control centers (LCC) had 4 shock isolators that suspended the LCC from the surrounding structure. The isolators used high pressure air.
__________________
Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
|

06-24-2017, 09:14 PM
|
 |
|
|
Join Date: Oct 2008
Location: Carson City, NV
Posts: 493
|
|
I see the tank prices vary widely based on location. The cheapest I could find rental tanks 250CF was $30 per month per tank in my area. At those prices, the $300 per tank to purchase sounded better. Exchange for a full one is supposed to be $32, although I have not had to do that yet. If I could rent for $30/ year, would have gone that route.
I was asked to leave an Airgas location when I finally admitted I was going to use industrial gas to fill my tank. He wanted to sell me "aviation oxygen" for twice the price listed above. I said I was under the understanding that there was no difference. That location sells medical, aviation and industrial oxygen, and he admitted to getting the supply from the same source, delivered in the same tank but the aviation gas was certified for moisture content. Told him I don't care about the paperwork. He said what if the line freezes. Told him the tank was right behind me so if it freezes, so do I. Could not win that one...
__________________
Joel
N626JA
RV-7A at CXP
Flying!
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 08:36 AM.
|