Notos with Scuba Tank

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Trucker3573 said:
You need exactly what John Blount linked. Also a cheap scuba is fine for the notos. Dont be discouraged by the negative comments. Hell you can tether that tank to a notos and get 100’s of shots off a fill. Not ideal for hunting but fine for shooting and plinking.
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That's exactly what I do (teather) when tuning a gun.
 
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midwest said:
Just so I am clear, will a SCUBA tank fill this to full capacity, or will it only get up to like 3000 psi or whatever the max pressure of the tank is?
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Will only fill to max pressure of the tank. However the notos is regulated at 1800 psi so you can use the scuba tank all the way down to that pressure.
 
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midwest said:
Thank you would it be a good idea to have a hand pump on hand and getting the max PSI from the tank and then top it off with the pump? Or just have a lower number of shots using the scuba tank
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That's up to you but I abandoned my pump after a month, "Ain't nobody got time for dat!"

I use a Yong Heng for the past 4 years and never looked back.
 
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Picked up the tank yesterday and today my kit arrived to hook up to the gun. The first time I filled I was able to get 21 shots before the gauge on the gun went from the green to red. The second fill I did the same but the last couple shots the accuracy dropped off. I am pleased with this set up and am glad it is working and not having to deal with a hand pump. I might get a couple less shots as it looks to only be charging to 3000 psi which is what I expected, but that is fine since it takes about 3 seconds to re charge with the scuba tank.
 
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midwest said:
Just so I am clear, will a SCUBA tank fill this to full capacity, or will it only get up to like 3000 psi or whatever the max pressure of the tank is?
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No it will not. The first fill it will come close, the second, less so, the thrid less and with each fill diminishing and so on. You could use a hand pump as suggested to finish topping the gun. But, no, a 3000 psi scuba tank will not fill a 3000 psi rifle to maximum capacity, not even once.
 
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midwest said:
Just so I am clear, will a SCUBA tank fill this to full capacity, or will it only get up to like 3000 psi or whatever the max pressure of the tank is?
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The gun and tank will seek equilibrium, the tank pressure will decrease as the gun is filled, the gun and the tank will equalize at the same but lower pressure each fill.
 
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3Crows said:
OP, that is an aluminum 80 SCUBA tank. Possibly one of the older 6351 alloy tanks. Do not purchase that tank. It is a 3,000 psi tank and that one has a standard K valve. The Notos takes a 3,650 psi fill pressure, even if that SCUBA tank is a newer 6061 alloy aluminum 80 it is still a 3,000 psi tank.

The problem with surplus (eBay) SCBA tanks or most new China tanks is a SCUBA diving shop is not going to fill them unless they have:

1. DOT stamps
2. Hydro
3. Annual VIP
4. Within 15 years life limit

A DOT approved tank or a SCBA in hydro is much more money. You might be better off to buy something like the CS4 compressor for your Notos.
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I will raise this thread from the dead. Sure the notos is a 3k+ fill but what is the regulator output pressure? If you have access to cheap or free scuba tanks and can get fills it's still better than waiting for a Chinese shoebox or hand pumping. You could even tether to the bottle for a day of bench shooting. I just wanted to add some hope for the lurking new guys that don't have a full kit yet. Youll end up there. I went from hand pump to 10L/min dive compressor over 15 years.
 
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6gun said:
I will raise this thread from the dead. Sure the notos is a 3k+ fill but what is the regulator output pressure? If you have access to cheap or free scuba tanks and can get fills it's still better than waiting for a Chinese shoebox or hand pumping. You could even tether to the bottle for a day of bench shooting. I just wanted to add some hope for the lurking new guys that don't have a full kit yet. Youll end up there. I went from hand pump to 10L/min dive compressor over 15 years.
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The cylinder appears to be one of the older 6351 alloy tanks that have a requirement for Eddy current testing of the neck threads for cracks due to sustained load cracking. No scuba store I know of will fill them and during my occasional employment in such stores I will NOT fill them, period. And many scuba stores will not fill aluminum cylinder that are older than 15 years because they do not want to. Luxfer long ago gave an incentive to purchase new tanks not of the 6351 alloy.

A new 80 cf aluminum cylinder can be gotten on sale for under $200 (Diver Direct, $169.50, Catalina 80) with a fresh hydro and the scuba store required VIP inspection. Nobody is going to do the expensive eddy current inspection on an ancient 6351 scuba tank. It is worth it's weight in scrap and no more. And even if it had the eddy current inspection it is unlikely a store would fill it or VIP it. Because they do not want to, their store, their rules.

If by checking the first hydro date it is a newer cylinder and not involved in the Eddy Current requirement, have at it. Again, many stores will not fill a cylinder over 15 years old even with current hydro even if it is the newer 6061 alloy. Some will, many will not. A hydro ($30 to $50) plus VIP ($10 to $15) plus the cost of the used tank, does the math add up to value for you?
 
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3Crows said:
The cylinder appears to be one of the older 6351 alloy tanks that have a requirement for Eddy current testing of the neck threads for cracks due to sustained load cracking. No scuba store I know of will fill them and during my occasional employment in such stores I will NOT fill them, period. And many scuba stores will not fill aluminum cylinder that are older than 15 years because they do not want to. Luxfer long ago gave an incentive to purchase new tanks not of the 6351 alloy.

A new 80 cf aluminum cylinder can be gotten on sale for under $200 (Diver Direct, $169.50, Catalina 80) with a fresh hydro and the scuba store required VIP inspection. Nobody is going to do the expensive eddy current inspection on an ancient 6351 scuba tank. It is worth it's weight in scrap and no more. And even if it had the eddy current inspection it is unlikely a store would fill it or VIP it. Because they do not want to, their store, their rules.

If by checking the first hydro date it is a newer cylinder and not involved in the Eddy Current requirement, have at it. Again, many stores will not fill a cylinder over 15 years old even with current hydro. Some will, many will not.
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Good information!
 
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The last of the (Luxfer) 6351 cylinders is around 1988. Just check the first hydro date and alloy. And then consider the age and asking price and price to hydro/VIP if required. Aluminum tanks are a dime a dozen, very common and easy to get a newer cylinder that shops will not scoff at. The 15 years or three hydros thing is not a law or regulation, it is store policy in many shops, especially I encounter it in Florida.

dan.org

Are 6351-T6 Alloy Scuba Cylinders Safe to Use?

Alloy scuba cylinders are prone to cracking and some have ruptured. Are alloy cylinders safe to use? Learn more.
dan.org dan.org
 
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3Crows said:
The last of the (Luxfer) 6351 cylinders is around 1988. Just check the first hydro date and alloy. And then consider the age and asking price and price to hydro/VIP if required. Aluminum tanks are a dime a dozen, very common and easy to get a newer cylinder that shops will not scoff at. The 15 years or three hydros thing is not a law or regulation, it is store policy in many shops, especially I encounter it in Florida.

dan.org

Are 6351-T6 Alloy Scuba Cylinders Safe to Use?

Alloy scuba cylinders are prone to cracking and some have ruptured. Are alloy cylinders safe to use? Learn more.
dan.org dan.org
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I should've said if the scuba is free or crazy cheap have at it, but i would never buy a scuba tank. I got a Scott scba with 2 years of hydro left on it for 99 bucks. Plus new chinese fill setups are cheap and owning a compressor (especially a bigger one off ali express) makes air less of a worry.
 
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ChrisS said:
Actually, the Notos is regulated to around 1800psi, so that's all you would need to be able to supply. A scuba tank, K valve adaptor and long hose would work perfect on a Notos. An 80 ft^3 tank starting at 3000psi would run the gun for hundreds if not thousands of rounds.

Chris
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Regulated pressure is not the issue - fill pressures in main vessels ARE!
 
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cavedweller said:
Regulated pressure is not the issue - fill pressures in main vessels ARE!
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You missed the logic. Max fill is neat and all but if you know your reg pressure you can calculate how much useful air is in the antique pressure vessel you are filling from. If the subject is shooting a notos theyre on a budget, if theyre using scuba, theyre on a budget...... So what can we calculate on the bright side of things. There's more to energy than the high side of the guage.
 
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The other thing you can do if you have to fill from scuba tanks for some reason is use them in a cascade. So if you have one tank that's only got 2400 psi in it you use that first to bring the pressure up to 2400 and then use your tank that's got 3000 psi in it to top it off. Once your tanks start to get too low for a decent fill, then you refill the one with the lowest pressure and it becomes the high pressure tank.

You can do this three or four tanks too and people used to set up fill stations with them all linked together so that all they had to do was open and close the valves one at a time. Fortunately, that's mostly a thing of the past now.
 
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