1850 PSI tanks?

[kramynot2000]

Every once in a while I come across tanks with a fill pressure of 1850 psi. Usually they are old but a pretty good deal. If they pass hydro, anyone see any reason not to pick them up? I'm just wondering about any trouble getting fills, etc.

 

[Don Burke]

Every once in a while I come across tanks with a fill pressure of 1850 psi. Usually they are old but a pretty good deal. If they pass hydro, anyone see any reason not to pick them up? I'm just wondering about any trouble getting fills, etc.

I would imagine they are old fire bottles. Considering how cheap aluminum 80s are, I doubt you'll find any benefit to the older tanks.

 

[fgray1]

How many Cu. Ft. are they.
I've never heard of them that's why I ask.
Fred

 

[captain]

Years ago U S Divers and others made 50 cubic foot tanks rated at 1850 also there were military oxygen cylinders used in aircraft rated at 1850. Many were converted for diving. I had two of them rigged as doubles.

Captain

 

[Bob3]

I have a set of USN twin 50s that are 1800 psi. Small bottles like that are great for making doubles out of, they have such a sweet balance to them you'll want to throw all your butt floating aluminum 80s away.
You won't have any problem getting fills here in Sacto. You might want to remind the fill guy of their pressure, or even write it on the neck with a Sharpie.
Drop me a PM if you need to get the critters hydroed.

 

[DA Aquamaster]

I owed a pair of of 50 cu ft 1800 psi steel tanks. I ended up highlighting the fill pressure with red paint after the second 3000 psi fill. Some of the air fill apes out there see a 50 and assume it's just like a 3000 psi AL 50. 3000 psi happens to be the hydro test pressure for an 1800 psi tank and overfilling them to that extent on a regular basis is not a good idea.

I also had a pair of 2015 psi 50 cu ft steel tanks and they were equally nice but also marked the fill pressure in red paint.

In both cases the 50 cu ft was based on a 10% overfill, so 45 cu ft is a more realistic number if filled to the service pressure.