hypothetical question

[T78 4]

would it be possible(if you were feeling fit!lol)and safe to fill or at least keep topped up a dive bottle with a stirrup pump?

[gilly-93 31]

good question id be intrested to now

[BBB 7]

i reckon not . but i could wrong i doubt it though maybe with a small bottle but a 15 or 18 litre no way. it only cost's£2 to fill a bottle any size at the diving shop and if you get a 15 or 18 litre it last's a long time loadsa fill's..

[T78 4]

i thought it would be possible but not sure how safe....i've got both and chuck the bottle in the back of the landrover when we go out lamping(only get 30 or so shots out of my fn12 )otherwise just use the pump to fill it. would be handy if it was possible to just top the bottle up myself when i got in.

[Grim Reaper 1]

I like they way you are thinking bud, but I think you could confidently say that no, it would most definately NOT be possible (not to forget SAFE) to fill or top up a divers bottle with a stirrup pump - due to the pressures needed to fill the divers bottle.

 

There are two pressures invloved in a divers bottle - either 232 bar, or 300 bar. These pressures are regardless to the physical size of the bottle involved - ie, small 3 litre bottles will be no easier to try filling than a 12 litre bottle,or bigger:o

 

If you consider how long and arduous it can be to fill up an air rifle resrvoir to say, 190-200 bar, then you can see one reason why its not a good idea.

 

The other thing to also consider is that most (though not all) bottles have whats called a 'DIN' valve fitted to the top. The bottle valve fittings are totally different to the valve found on most air rifle reservoirs. Theres reason two.

 

Add to that the question of wether you would actually want to be there pumping for a month of sundays before you find that you wouldn't have been able even so much as make one pump cycle! A bit like trying to piss out a house fire in my reckoning! Lol

 

I personally, wouldn't even consider it mate - much safer and faster to pay the 'top up' price at your local dive centre.

 

Hope this helps?

 

 

Regards,

Grim.

Edited July 31, 2008 by Grim Reaper

[ferretville 69]

I like they way you are thinking bud, but I think you could confidently say that no, it would most definately NOT be possible (not to forget SAFE) to fill or top up a divers bottle with a stirrup pump - due to the pressures needed to fill the divers bottle.

 

There are two pressures invloved in a divers bottle - either 232 bar, or 300 bar. These pressures are regardless to the physical size of the bottle involved - ie, small 3 litre bottles will be no easier to try filling than a 12 litre bottle,or bigger:o

 

If you consider how long and arduous it can be to fill up an air rifle resrvoir to say, 190-200 bar, then you can see one reason why its not a good idea.

 

The other thing to also consider is that most (though not all) bottles have whats called a 'DIN' valve fitted to the top. The bottle valve fittings are totally different to the valve found on most air rifle reservoirs. Theres reason two.

 

Add to that the question of wether you would actually want to be there pumping for a month of sundays before you find that you wouldn't have been able even so much as make one pump cycle! A bit like trying to piss out a house fire in my reckoning! Lol

 

I personally, wouldn't even consider it mate - much safer and faster to pay the 'top up' price at your local dive centre.

 

Hope this helps?

 

 

Regards,

Grim.

 

Sensible words there GR pit save ya self the hassle mate and spend a few quid fv

[countrycommando89 7]

if you where trying to keep it topped up you would have to fight the air coming out of the dive bottle. would probably blow up your stirrup pump.

[Grim Reaper 1]

if you where trying to keep it topped up you would have to fight the air coming out of the dive bottle. would probably blow up your stirrup pump.

 

Funny you should mention that . . . . . i forgot to say that in my post! lol

 

Cheers for mentioning it anyway chap.

 

 

 

Shoot sure, & shoot safe guys,

Grim.

[Grim Reaper 1]

Sensible words there GR pit save ya self the hassle mate and spend a few quid fv

 

 

Cheers FV, I'm just glad to help out where I can.

 

 

 

Regards,

Grim.

[T78 4]

but doesnt a stirrup pump have a return valave built in?to stop "blowing it up"?after all theres 200 bar in the hose when filling up an air rifle? and if you took the hose off the bottle fitting,my stirrup pump would screw on... its a falcon fitting so just standard.... it would be possible to connect but just dont know if it would be physically possible??

[Guest bigredbusa]

how bigger bottles are we talking , i only ask as let me know when you attempt it and i will see if i can hear the blast from here

 

imagine if a stirup was strong enough to do it tho you would be mega fit

[lukmoun4 0]

i get my bottle filled up for free at the local fire station

[countrycommando89 7]

theres a hell of a lot more than 200 bar in a bottle though (isnt there????) im guessing that your pump handle and shaft would go ballistic. i dont think the return valve could handle the flow.

[T78 4]

ive no intention of trying it but im sure it would be possible.... say a bottle holds 232 bar,the pump is capable of pumping up to that pressure so im sure the return valve in the pump is capable of withstanding that pressure! its just the volume of air you'd have to put in that would be a poroblem.

[Guest bigredbusa]

what would give up first , your lungs or the stirup . and wouldnt it be a lot of wet air going in ?