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Old December 7th, 2012, 09:01 PM   #1 (permalink)
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tank questions.

so i bought a used hpa tank, its a crossfire 68/4500 tank, its used, so i have no clue what the person i bought it from has done to it. from what ive seen online if you put oil down the fill nipple the tank WILL explode, now im asking if there are any ways to test that by maybe shaking the tank and listening to water sounding noises, if i can take the regulator off (the tank is on 0) and look inside and replace the o ring or what. also does a low output tank use less air?
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Old December 7th, 2012, 09:40 PM   #2 (permalink)
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A low output tank does not use less air. The amount of air you use is dependent upon your marker and how much air it uses.

You don't need to do anything to test for that. Gun oil is mostly water based and will evaporate if it sits out for a couple days. The tank should be safe to use.
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Old December 7th, 2012, 11:44 PM   #3 (permalink)
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PHEWW! haha i was worried. and ok that's what i thought, for some reason i thought the tanks reg. is at 850 so i figured it pumps that into the gun and only 200 is used and the rest of the 650 is wasted or to make up for things, idk haha dont ask.
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Old December 7th, 2012, 11:46 PM   #4 (permalink)
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it does pump 850 psi into your marker. You marker also has a regulator on it that reduced the pressure to whatever it needs.
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Old December 8th, 2012, 12:11 AM   #5 (permalink)
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uhm. make sure you let it sit with the reg off. can't evaporate if its not open... obviously
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Old December 8th, 2012, 12:19 AM   #6 (permalink)
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if the previous owner had put oil in there it would have blown up on him. its fine
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Old December 8th, 2012, 10:19 AM   #7 (permalink)
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yeah i understand the air thing, but if your tank blasts 850 and you only need like 2-300 for your marker at most wouldn't you be wasting air? if 200's all you need and 450 (last i checked) is less than 850 but more then 200, that's a huge difference, so wouldn't you be saving air? idk just blowing hot air here LOL. its not like it makes a difference i have a high output tank and i dont plan on buying a new one any time soon so... yeah i figured he probably hasn't put oil in, judging by his box of paintball stuff he knows a little about paintball haha so he probably knows not to do that. he could of used the tank up then oiled it? idk i really doubt its a bomb, at least not anymore, from what ive heard it has been stored in a box for a little while, maybe like a year? at most.
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Old December 8th, 2012, 10:57 AM   #8 (permalink)
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thats what your in-line regulator is for. but the air doesn't get wasted. it gets saved and used in the recharge cycle of your reg (actually i'm bs'ing but thats what my logic tells me)
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Old December 8th, 2012, 11:16 AM   #9 (permalink)
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oh ok so kinda like the gas system on like an ar-15 or m16
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Old December 8th, 2012, 12:52 PM   #10 (permalink)
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Quote:
Originally Posted by tubs26 View Post
yeah i understand the air thing, but if your tank blasts 850 and you only need like 2-300 for your marker at most wouldn't you be wasting air? if 200's all you need and 450 (last i checked) is less than 850 but more then 200, that's a huge difference, so wouldn't you be saving air? idk just blowing hot air here LOL. its not like it makes a difference i have a high output tank and i dont plan on buying a new one any time soon so... yeah i figured he probably hasn't put oil in, judging by his box of paintball stuff he knows a little about paintball haha so he probably knows not to do that. he could of used the tank up then oiled it? idk i really doubt its a bomb, at least not anymore, from what ive heard it has been stored in a box for a little while, maybe like a year? at most.
That ~600 air that isnt "used" just sits in the air line and waits to be used. The air doesn't get vented, the entire system is a closed loop.
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Old December 8th, 2012, 01:11 PM   #11 (permalink)
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^^^ exactly

think of it this way, there is 800 psi coming into the marker, the regulator then has a seal and there is 600 psi pushing on that seal by a spring in the direction of the regulator, once air comes through it then pushes on the opposite side and contributes to the already 600 psi spring pressure pushing on the seal. once there is 200 psi on the marker end of the seal that is a total of 800 psi on both sides so it is then equaled out and there is 200psi of air on one side and still 800psi on the other

air will expand to fill whatever container it is in, but if you give the same pressure a larger volume it will expand and will come to a lower pressure, its the same amount of air, just at a lower pressure but taking up a larger volume.
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Old December 8th, 2012, 07:55 PM   #12 (permalink)
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ohhh alright gotcha. thats why when you have an on off asa you have to purge the system when you take it off. like when you turn it off theres still like 3 or 4 shots you can still get out of it
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Old December 8th, 2012, 09:54 PM   #13 (permalink)
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if it is an on off and not an on/off bleed, yes
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