- May 11, 2009
- Houston area, Texas
- Display Name
I purchased a 15 cf aluminum tank and have a 40cf steel tank sitting. Any advice on where to purchase some set up to fill from the 40cf? I don't see us on oxygen often but it will be nice to have, just in case.
The FBO at Wilmington wanted $50 to fill the tank (15cf) and I told them they were crazy! I said all the 100LL fuel I buy out of this place and that's the best you all can do? After a brief discussion they said $25 and even though I thought that was still a bit high I had them fill the tank. I didn't want to wait until the following Monday when the welding shop would fill it.
The 40 CF wont give you that much in the way of "fill" power... Maybe twice before you have to refill it... BUT..
Go to a welding gas shop, and have them either sell you the parts, or assemble the parts to allow you to transfill. Essentially 2 CGA-540 fittings on either end of a high pressure hose.
Things that make it BETTER are a small bleed valve in the hose. Closed when filling, then when both tanks are closed, you bleed off the pressure in the line before loosening. Not necessary but goes easier on the threads than loosening a hose under pressure.
CGA 540 valve stems need to be on both tanks. This is the Compressed Gas Association's industry standard.. and this way these tanks and your hoses will be compatible with other oxygen filling systems elsewhere. The CGA 540 specs out thread pitch, fitting diameter and fitting length, to prevent incompatible gas systems from being connected. Different gasses have different CGA numbers. The guys at the gas shop should know this.
It would be a VERY GOOD IDEA to have the steel tank inspected first, and ensure that its within hydro (hydrostatic test date), especially if its been empty. Again, gas shop can help.