Scott air bottles , and fill stations.

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OldVet said:
I have a couple of old Scott fireman air bottles and the thread on these is 5/8 flare. I want to use a newer fill station set up rather than the fireman's valve
Is there anyone who can help me with this the fill station I want to use has a M18 x 1.5 thread size.
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Mak sure you do your required hydro tests
safety first!
 
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I've got one along with a fill station but the gauge built into the valve leaks.. and I tried getting a new valve but mine is a odd size.. just a little bit more than 1" diameter threads..I gave up on it..
will be interesting if you figure something out.. mine is all aluminum and wrapped around the main body and neck.. flat bottom so it stands up like a welding bottle..
I gave up on it since it is expired and the gauge leaks.. so if anyone is interested in the fill station and or the bottle, let me know.. I paid I think around $75 for the fill station and it was only used to put 500# in the tank to only find out it leaks..
id like to have a tank, but at this point I'd probably rather get a new one..
although at the cost, it might be cheaper to get a second compressor GX duel battery to take in the field.
Mark

IMG_20250119_154248032.jpg
 
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Thanks Gerry52 I did not now the factory tank valves would fit as there is no thread size mentioned on e- bay maybe I could contact the seller. The newer fill stations have 2 gauges , and and a fill nipple. I did not know the old factory valves were useable. I am learning still. Can you post a pick of your setup , so I can see how you did it , , and do you know the thread pitch on yours as the one a above is just a little more then 1 inch , and mine is 5/8 flare.
 
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OldVet said:
markhooper the guage itself leaks , or where screws into the valve ?
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the gauge built into the valve.. the tank pressure gauge.. so l put 500# in it and turned the valve off.. first try it leaked between the tank and valve a lot.. went to the scuba shop and of course they won't work on it but no problem getting the tank to valve o ring. put it in with some silicone grease and sealed up fine.. so I filled it up to 500# again and it has a slow constant leak at the pressure gauge you see in the valve.. fill station is new and no leaks there.. so the tank gauge leaks with the main valve turned off..
Mark
 
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The fear of some sort of massive failure of a carbon fiber reinforced tank needs to stop being pushed. The only time I know of it happened involved a grossly, purposely damaged tank and a gross overpressure. Nothing at 300 bar or below. We need to check our bottles for damage but I confidently continue to use my "expired" Scott tank. If it ever leaks I will get another.

I use the stock valve and gauge and a fill set from air tanks plus. I pulled the spring out of the valve mechanism and find it easy to modulate.
 
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JimD said:
The fear of some sort of massive failure of a carbon fiber reinforced tank needs to stop being pushed. The only time I know of it happened involved a grossly, purposely damaged tank and a gross over pressure. Nothing at 300 bar or below. We need to check our bottles for damage but I confidently continue to use my "expired" Scott tank. If it ever leaks I will get another.

I use the stock valve and gauge and a fill set from air tanks plus. I pulled the spring out of the valve mechanism and find it easy to modulate.
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I think it wise to: know the rules "laws" governing our high pressure toys, and follow those in the interest of safety and liability to others.
That said what someone does in the privacy of their own little world is of no consequence to others. I spent 21 years as a Navy specwar diver and you can bet your backside HP air can cause injuries.. so I'm not pushing a massive failure conspiracy... What i am doing is putting safety before finances.
 
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I get the "safety first" thing.. I prefer to promote awareness. It's true, hpa ain't no joke but if you think that a high pressure air tank is a potential large pipe bomb then I have to ask.. when is the last time you had the tube on your favorite PCP tested? You know, the one you fill to 300 bar and hold within inches of your face every shot? The one that you cycle many, many times more often than a tank?
Just sayin'
 
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BGarney said:
I get the "safety first" thing.. I prefer to promote awareness. It's true, hpa ain't no joke but if you think that a high pressure air tank is a potential large pipe bomb then I have to ask.. when is the last time you had the tube on your favorite PCP tested? You know, the one you fill to 300 bar and hold within inches of your face every shot? The one that you cycle many, many times more often than a tank?
Just sayin'
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Personally, i follow the manufacturers recommendations, which "generally" comply with existing laws; these can vary by country.

That said, i inspect and or replace my high pressure vessels and equipment when they reach their end of life cycles.

Each of my PCP airguns has a data card which lists:
Purchase point and cost and date acquired and warranty information when applicable
Serial #
Date of last reseal and date next reseal is advisable
Pressure vessel exp dates.

Easy Peasy and it is very helpful to keep it in the computer and set reminders for such things...
just like changing the batteries in your smoke detectors so they don't wake you up at 2 a.m.
 
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cavedweller said:
Death by HP air is more destructive

know the rules follow the rules especially if other people are exposed to your equipment.

if alone…. Then do what you want
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Nope! Ultrasound is available and is non destructive.

Death by HPA? Besides the one testing lab running 12,000 psi in to 4500psi bottles until they popped that put out a video, have you ever heard of such a thing?

None of us have.
 
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cavedweller said:
I think it wise to: know the rules "laws" governing our high pressure toys, and follow those in the interest of safety and liability to others.
That said what someone does in the privacy of their own little world is of no consequence to others. I spent 21 years as a Navy specwar diver and you can bet your backside HP air can cause injuries.. so I'm not pushing a massive failure conspiracy... What i am doing is putting safety before finances.
Click to expand...

Please tell me, what laws are you speaking of?

DOT compressed gas transportation, vessel inspections and refilling of non-approved vessels apply ONLY to those in commerce.

Private citizens about normal lives are not subject until/unless they engage in commerce.
 
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cavedweller said:
Personally, i follow the manufacturers recommendations, which "generally" comply with existing laws; these can vary by country.

That said, i inspect and or replace my high pressure vessels and equipment when they reach their end of life cycles.

Each of my PCP airguns has a data card which lists:
Purchase point and cost and date acquired and warranty information when applicable
Serial #
Date of last reseal and date next reseal is advisable
Pressure vessel exp dates.

Easy Peasy and it is very helpful to keep it in the computer and set reminders for such things...
just like changing the batteries in your smoke detectors so they don't wake you up at 2 a.m.
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No, no you just sell your pcp as is and leave it to the next guy to figure it out.

When is the last time you removed a guns tube and hydrod' it?

Answer: Never!

Why?

Because they CAN'T!

Hypocrisy while standing on an ivory tower is one thing but unless you are willing to hydro your 3 year old pcp air tube, spare me the preaching, brother!
 
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These 2 old Scott tanks are huge listed as 45 min , And fill to 4,500 psi. My Zelos is a 3,625 , so I was only going to fill to 4,000 just to be safer , and only try to fill my 500 cc bottle to 3625.
They are in good shape as far as a visual inspection goes. I probably won't be able to get anyone's help to test at HP as these are expired. If only HP makes it a bomb I would hope I have no worries. I've heard of people's rifle tanks , or bottles leaking , and they just replace the seal , but never exploding.
I never heard of a plenum exploding due to burst disc keeping it safe. Now to check out : Air Tanks Plus . Hope I can get a dual guage air station there.
Thanks everyone for all your advice,band input.
 
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OldVet said:
Thanks Gerry52 I did not now the factory tank valves would fit as there is no thread size mentioned on e- bay maybe I could contact the seller. The newer fill stations have 2 gauges , and and a fill nipple. I did not know the old factory valves were useable. I am learning still. Can you post a pick of your setup , so I can see how you did it , , and do you know the thread pitch on yours as the one a above is just a little more then 1 inch , and mine is 5/8 flare.
Click to expand...
So, let me see if I understand correctly. You have Scott tanks but no valves on them? If you'd post pictures it would clear things up in a flash. Not sure if you want to replace existing valves or have tanks with no valves.If you have existing valves that WORK you can just get a CGA347 fill adapter off Ebay & be done with it. My 3 fill adapters have functioned GREAT for 8 years. BTW, how OLD are these tanks? Carbon fiber or all metal? Again, Pictures please! Also, sometimes with new guys the incorrect terminology is used & becomes confusing to us trying to interpret.
Here's my setup:
20250120_090117.jpg
 
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lots of talking about testing the tanks and it's apparent some don't know what they are saying..
dive shops send the tanks to get tested.. and if they don't pass they cut in half.. it's industry standard.. welding tanks get tested.. portable propane tanks get tested and restamped..
I don't know of any places that actually test air tube because everyone has a different fitting..I also don't see expiration date on the air tube like the tanks..
I'm sure they have reasons for having expiration date..
I don't know about you all but it gets old reading all the arguments..
Mark
 
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