SpudFiles

A little history;

I have been looking around for a pressure reservoir to build my Poland Spud compressor.

I called the local fire safety company and enquired about co2 fire extinguishers.

They apparently throw them away when they are out of date. I could have them for hauling them away.

When I went to pick them up this morning, I was asked if I wanted empty ones, or full ones. I picked up 2 x 5lb and 1 x 10lb, the 10 and one of the 5's are full.

I removed the valve from the empty 5lb and verified that it does have 1/2" NPT threads.

These bottles have an 1800psi rating, and are steel. (heavy 13+lbs empty for the 5lb)

Then I noticed the swivel on the nozzle. Once you remove the nut, you have a ready made probe style fill, with 1/4" NPT threads.

The 10lb looks to have 1" NPT threads and even comes with a pressure hose.

The main valves could be used to replace a blow gun maybe?


Other details:

These are old General brand extinguishers.

The 10lb weighs 20 1/2 lbs empty according to the stamp on the valve. +10lbs when full of course.

The pressure hose has a rating of 2500psi on it.

wow... I must do the same...

I'm really suprised that they are 1/2 NPT

Wow nice find! I just might have to stop by our fire station and try my luck

How heavy would you say the 10lb tank?

biggsauce wrote:How heavy would you say the 10lb tank?

10 pounds

LikimysCrotchus5 wrote:

biggsauce wrote:How heavy would you say the 10lb tank?

10 pounds

A 10lb tank holds 10lbs of CO2, and if it is also steel, will weight much more than 10lbs.

Even my 20lb AL tank weighs more than it's capacity.

So what does the 10lb refer to?

LikimysCrotchus5 wrote:So what does the 10lb refer to?

As I said, a 10lb take holds 10lbs of CO2, it is simply the CO2 capacity. Just as a 12g tank holds 12g of CO2, and a 9oz tank holds 9oz of CO2.

O sorry, i misunderstood, but i got it, i feel idiotic

No worries, this is how people learn things.

wow nice find! I'll have to talk to my friend who is a volunteer firefighter about getting some of these...

My fire extinguishers come from the recycling site they like you to bring them back empty which is quite easy ,also my son likes them in the warm pool in the summer good water canons.

I updated and added a couple pics as promised.

Now I need a nitrogen regulator (500psi output).

It was most definitely worth the phone call!

nice... what volume are those? (cubic inches maybe?) Yea I need a cheap regulator for the gun I'm building my friend.. and it has to be real cheap... lol

Now I need a nitrogen regulator (500psi output).

Better hope your wallet's pretty fat. I had to shell out over $250 for my 0-500 psi N₂ reg.

The 5lb ones are about 4.5" (acounting for wall thickness) in dia. and about 11" to 1/3 of the curved portion. (if that makes any sense)

A rough calculation would put it at 175 cu.in. I would suppose that the 10lb would be double that because it's liquid co2.

No problems on the regulator, ebay has them for around 80.00 plus shipping. (Ok it's only 450psi, but I only need 400)