Dive tank questions

[Geekeboy]

Hi guys
Couple of questions about the dive tanks below
My local dive centre are selling dive tanks with the valve

http://www.divecentral.co.uk/paintballing.shtml
My question is:
What difference would a 232 be to a 300 bar tank?
How many fills do you get from each size?
Whats a bleed and hose?
3lt 232bar with Gun Valve
3lt 300bar with Gun Valve
3lt 300bar with Gun Valve, Bleed and Hose
7lt 232bar with Gun Valve
7lt 300bar with Gun Valve
12lt 232bar with Gun Valve
12lt 300bar with Gun Valve

Cheers in advance

Geekeboy

[tdc]

232 will do a 3000 psi fill
300 will do a 4500 psi fill

don't know about fills, a hose is something you get the air to go through so it's not directly attached to the bottle i would have thought, and a bleed will empty the bottle probably

[Dru]

the 'screwbleed' i believe releases the excess air before filling from between the dive tank and your bottle oh and in my experiance stay away from the 232 bar as you wont get as many full fills as a 300bar hope this helps

[tdc]

though it is unwise to use a 300bar tank to fill a 3000psi bottle... as when the pressures equalize it will be above 3000psi (and it's all to easy to slip and go above 3000psi even if you are putting it in very slowly and not letting them equalize.....

[Dru]

though it is unwise to use a 300bar tank to fill a 3000psi bottle... as when the pressures equalize it will be above 3000psi (and it's all to easy to slip and go above 3000psi even if you are putting it in very slowly and not letting them equalize.....

just going off what my local does my steely was 3000psi 307bar

[tdc]

odd... 307 bar gives a ~4450psi fill *if preasures are equalized* ... might depend on what sort of fill system they used to get it into the steely.... maybe they could limit it so that it didn't go over 3kpsi ... :S

[Geekeboy]

thanks guys,

I have read that everytime you take some air out of the
cylinder it will deplete, eg
1st fill 4500
2end fill 4200
3erd fill 4000

what happens if this keeps going down? is it then useless?

[mattchew]

You get a refill from a dive shop!

[Geekeboy]

duh sorry

just re read what i wrote!

sorry

[systemxmark]

you will find that after each fill you will get a decrease in pressure within the bottle, so after a few fills you will start to drop own pressure within the dive tank and it will fill your bottle to 4000 then 3900 etc etc. its not a drastic change to begin with, my 300bar 12ltr tank last me two days play. do it in moderation, fill to 3000psi every time and you willget more 3000psi fills than if you blitz it straight away. in my experience.

with regards to the 307 bar, you will find all bottles are tested to a higher pressure than what they operate at. i.e my dive tank is tested to over 400bar, for safety reasons i.e diving if you was to dive below a certain depth the pressure also increases on the outside not just the inside. so your steel air bottle could well be tested to 307bar its fairly normal. does not mean fill it to 45oopsi and hope all is well.

if you get one filled make sure they fill it properly most places just fill it to 232/300 bar and then job done, you wil lose loads of pressure before you even use it. when its filled the hot air expands thus taking up more room so when its cooled down it condenses thus lowering the pressure. a good dive shop will either do it in 2 stages or use a water tank. i.e stick it in cold water while its being filled.

[NitroBall]

Everytime i pop down to fill a dive tank at the local scuba dive center its scary watching .

They connect the air line and wack the pressure up, i tend to walk away to the other end of the shop:o

When its done filling, the tank feels warm enough to make me sweat on a winters morning.

[biscuit]

go some where else before he blows you up:eek: :eek: when i take mine he puts it on the fill rig and says come back in half hour cause it will takethat long to fill and its in a water tank:)

[Royston]

cool, having read all this i feel ok enough purchasing a dive bottle. please ignore my post in techie section.