SCUBA tank, on board air.
#1
Registered User
Thread Starter
SCUBA tank, on board air.
I have a York compressor almost ready to go on my truck. It puts out 7cfm (the big ARB puts out 2 or something), so I dont even really feel I need a tank, but I'm worried that the pressure release (blow-off valve?) won't handle 7cfm and the pressure in the hose will increase past it's capacity before the compressor can turn off. Thus, I want some kind of cheap tank.
I found an old SCUBA tank (about 2' x 9") at a junk store with the original fittings. Are these NPT? Its steel I believe.
The other tank I found was an old aluminum pressurized kerosene tank for a kerosene stove. Again, not sure whether the fittings are NPT, but at least it has a shraeder valve.
There was also an old medical oxygen bottle, NPT?
I found an old SCUBA tank (about 2' x 9") at a junk store with the original fittings. Are these NPT? Its steel I believe.
The other tank I found was an old aluminum pressurized kerosene tank for a kerosene stove. Again, not sure whether the fittings are NPT, but at least it has a shraeder valve.
There was also an old medical oxygen bottle, NPT?
#2
Contributing Member
Not sure on the fittings. You certainly don't need a tank that big (and the space it takes up)
What pressure does the York run at? Could be too high for lockers, and another regulator on the output of the tank would be a good idea.
What pressure does the York run at? Could be too high for lockers, and another regulator on the output of the tank would be a good idea.
#3
Registered User
Thread Starter
With a larger system volume, the pressure will increase slower and the pressure valve will have time to turn off the compressor without a huge spike in pressure.
#4
Registered User
Thread Starter
A semi wrecking yard is charging $40 for a 2 gal tank, which is a little much I think. This is a jury-rigged, budget project, cause all the NPT fittings are going to be the expensive part.
#6
Registered User
#7
Registered User
Thread Starter
That s a bit of drive to go from San Diego to Vancouver, but those crack heads are pretty determined.
Do you know if scuba tanks are NPT, seeing as you have some experience with them.
Do you know if scuba tanks are NPT, seeing as you have some experience with them.
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#8
Contributing Member
I'm a scuba instructor and you've got to be careful with those old scuba tanks. There is a date stamped on the tank itself, that is a hydrostatic test date, if it's over 5 years it's not considered safe for a fill.
I heard a tank blow (luckily no one was in the compressor room when it happened)...
it left a very large chunk out of the wall heheheh
but all joking aside take that tank to a scuba shop and get it 'hydroed' and visually inspected, they'll stamp the steel with the new hydro date and put a fill sticker on there good for a year until your next visual inspection and you'll be good to go!
I heard a tank blow (luckily no one was in the compressor room when it happened)...
it left a very large chunk out of the wall heheheh
but all joking aside take that tank to a scuba shop and get it 'hydroed' and visually inspected, they'll stamp the steel with the new hydro date and put a fill sticker on there good for a year until your next visual inspection and you'll be good to go!
#9
I'm a scuba instructor and you've got to be careful with those old scuba tanks. There is a date stamped on the tank itself, that is a hydrostatic test date, if it's over 5 years it's not considered safe for a fill.
I heard a tank blow (luckily no one was in the compressor room when it happened)...
it left a very large chunk out of the wall heheheh
but all joking aside take that tank to a scuba shop and get it 'hydroed' and visually inspected, they'll stamp the steel with the new hydro date and put a fill sticker on there good for a year until your next visual inspection and you'll be good to go!
I heard a tank blow (luckily no one was in the compressor room when it happened)...
it left a very large chunk out of the wall heheheh
but all joking aside take that tank to a scuba shop and get it 'hydroed' and visually inspected, they'll stamp the steel with the new hydro date and put a fill sticker on there good for a year until your next visual inspection and you'll be good to go!
#10
Registered User
kinda off topic but would a full Scuba (3000psi) be safe to drive from 4500ft to sea level mounted in a vehicle?
mine is for on board air as well but i use an adapter for a paintball tank to a 48ci (regulated to 800psi)tank to an external regulator set at 100 psi to standard yellow coil airhose to fill tires
mine is for on board air as well but i use an adapter for a paintball tank to a 48ci (regulated to 800psi)tank to an external regulator set at 100 psi to standard yellow coil airhose to fill tires
Last edited by ETRNL; 09-05-2008 at 03:24 AM.
#11
kinda off topic but would a full Scuba (3000psi) be safe to drive from 4500ft to sea level mounted in a vehicle?
mine is for on board air as well but i use an adapter for a paintball tank to a 48ci (regulated to 800psi)tank to an external regulator set at 100 psi to standard yellow coil airhose to fill tires
mine is for on board air as well but i use an adapter for a paintball tank to a 48ci (regulated to 800psi)tank to an external regulator set at 100 psi to standard yellow coil airhose to fill tires
#12
Contributing Member
pressure
so when you are high up in the mountains, there are other things to worry about with your tank and your body...for example, there will be a lot less oxygen in each breath as the molecules will be dispersed, so the higher you go, the less O2 is getting to your brain. That's why those Everest climbers need O2canisters to stay focused etc.
as far as wheeling at the ranges you're talking about this shouldn't be an issue at all, but if you ever plan on diving with that tank be careful not to drive up high into the mountains right after scubadiving, this is just like being in a plane and if you drive up too high soon after diving you will get bent
#13
Contributing Member
iTrader: (3)
I think there may be some NPT fittings on a Scuba tank. I once did an air up system for a guy that works at a resort where they use those tanks and he wanted to be able to air up his tires from the high pressure tank. He sent me a 1/4" NPT fitting quick disconnect fitting that fit the Scuba regulator and I integrated that into the air hose:
- http://www.4crawler.com/4x4/ForSale/4air.shtml
Another option is a used pressurized water fire extinguisher. They are rated for 200 psi and made of stainless steel. They do have one 1/8" NPT fitting, but I drill and tap the head for 3/8" and 1/4" NPT fittings:
- http://www.4crawler.com/4x4/CheapTri....shtml#Storage
- http://www.4crawler.com/4x4/ForSale/4air.shtml
Another option is a used pressurized water fire extinguisher. They are rated for 200 psi and made of stainless steel. They do have one 1/8" NPT fitting, but I drill and tap the head for 3/8" and 1/4" NPT fittings:
- http://www.4crawler.com/4x4/CheapTri....shtml#Storage
#14
Registered User
Thread Starter
I'm going my a semi wrecker to look at air brake tanks today.
Given my situation described above, do I even need a tank?
The way I see it, a scuba tank rated to 4000psi isn't even going to notice 120 psi, even if it expired. If you disagree, please explain.
Given my situation described above, do I even need a tank?
The way I see it, a scuba tank rated to 4000psi isn't even going to notice 120 psi, even if it expired. If you disagree, please explain.
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