How to put water into a cylinder

[pezzer32]

Hello how do you put water into a cylinder? can it be done what equipment do i need to do this?

[londonsean69]

Why would you want to?


Depressurise
Take out valve
Fill with water


Unless of course you mean how do you do a hydrostatic test, in which case;

Take to good dive centre / test centre
Pay

[londonsean69]

I've just seen your other thread, about filling it with O2 then popping a 'few thousand PSI'.

Dont, just dont. If you use a steel tank, the increased oxygen content in conjunction with 'a lot' of moisture means it will rust quicker than a Fiat.

I am still interested in why you would want to do this?

[rockinrobin]

...it will rust quicker than a Fiat.

Oi, I drive a Fiat and it's got no rust on it at all.













True, it's only a few months old............................:think:

[Ian_6301]

You wait till friday before posting stuff like this...

I presume you wish to make a super soaker of sorts...?

Use a hozelock/Killaspray doofer as a pressure chamber (the big ones with the stirrup pump style bit coming out the top) - fill that with water.

Fill the diving air cylinder with air only, never water. Use this with a cheap reg, de-tuned to an appropriate IP (I think it's a measely 4 bar?), then use something like an LPI hose and a standard LPI nipple, or better yet some posh conectors with a shutoff on the male end. CAREFULLY drill and tap a hole into the pressure chamber of the sprayer, or better yet re-use an existing one. Make sure the nipple is adequately secured, otherwise it will become a missile if it breaks loose...

Fill the sprayer with water, then attach the hose from the regulator. Open the cylinder valave to pressurise until the pressure relief valve lifts on the killaspray, then shut off. Now go soak someone.

In fact, that sounds so easy, I might just go and fettle one up!

[Chrisch]

... what equipment do i need to do this?

http://www.starfishbay.co.uk/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/j/u/jug1.7_1.jpg

[Chris Thomas]

and this to get the valve out.

http://4.bp.blogspot.com/_MKCdfZ85Z5o/TS83iL8CRsI/AAAAAAAAAKM/LXubnBMk1DA/s1600/spanner.jpg

[smudger]

and this to get the valve out.

http://4.bp.blogspot.com/_MKCdfZ85Z5o/TS83iL8CRsI/AAAAAAAAAKM/LXubnBMk1DA/s1600/spanner.jpg

Are you sure thats big enough?
:x::x::x:

[Chris Thomas]

Pretty sure that's length of the spanner, not the opening!

Though this one might help you with any large nuts you need to move...

http://www.3dprinter.net/wp-content/uploads/2012/12/objet1000-wrench-3d-printed.jpg

[Hickdive]

http://www.3dprinter.net/wp-content/uploads/2012/12/objet1000-wrench-3d-printed.jpg

How do we know that isn't just a very small bloke?

[Nickpicks]

Assuming this is a hypothetical question, and you're wondering if a cylinder can be used as some sort of water rocket.

The way that water rockets are usually filled (well, the ones in my kid's toy kit) is that you put the suction of a hand pump in a reservoir of water and pump it into the bottle. once the water runs out (the bottle is about 1/3 full of water), you keep pumping (50 pumps) which adds air to the bottle and pressurises it. You then turn the bottle so the neck is down, and launch it. (the kit comes with a quick release connector / launcher ad non return valve)

You could do this with a scuba cylinder by removing the valve, part filling with water, reconnecting the valve, then pressurising with air (actually, if you used helium, then you may avoid the corrosion problem you'd get with oxygen)


If you're thinking of doing this with a scuba cylinder weighing about 16kg, plus another 8kg of water, then you've got a very powerful missile. There are videos on the internet showing what happens when you break off the valve on a cylinder filled with air.

Now, the fluid dynamics question:

If we were to do this, the viscosity of the water would mean it would come out at lower velocity than air, but would the increased mass of the water being ejected give it more force? The total vehicle would be heavier as a result of the water. Would this mean the water filled rocket would go faster or slower than the air filled cylinder?

I know that with plastic bottles, the air comes out faster, so the force is only applied for a short time, so the vehicle doesn't move very far. Adding water means the force is applied for a longer period, so it goes further.

Thames & Kosmos > Products > Air + Water Power (http://www.thamesandkosmos.com/products/construction/awp.html)

[Logun]

and this to get the valve out.

http://4.bp.blogspot.com/_MKCdfZ85Z5o/TS83iL8CRsI/AAAAAAAAAKM/LXubnBMk1DA/s1600/spanner.jpg

Would I need a metric or imperial one?

[MarkP]

Would I need a metric or imperial one?Depends on the valve - is it one of those newfangled M26 nitrox jobbies?

[Chris Thomas]

Would I need a metric or imperial one?

Depends on the valve. If its made in the EU, metric.

I've never been able to source a left handed, imperial adjustable spanner.

[doggy's doodah]

I've never been able to source a left handed, imperial adjustable spanner.

I've got a boxed, matched set of 2, LH and RH.

Yours for 50 squid.






And before anyone starts, that is really 50 quid, so leave it with the smelly cephlapods (sp)

[Major Clanger]

I've got a boxed, matched set of 2, LH and RH.

Yours for 50 squid.






And before anyone starts, that is really 50 quid, so leave it with the smelly cephlapods (sp)

From the same place that sells left handed screw drivers and AC batteries?

[Hickdive]

From the same place that sells left handed screw drivers and AC batteries?

Yes, in the aisle between Long Stands and Tartan paint.

[Chrisch]

... AC batteries?

AC Batteries - Alternating Current Battery Packs and Standby Power Applications. Information from Electropaedia (http://www.mpoweruk.com/ac_batteries.htm)

[rockinrobin]

I don't see why everyone is assuming this is either a really stupid question, or a wind-up. To me it seems like a really sensible idea, especially if it's going to be used for long deco dives.

After all, who among us hasn't started to feel a little but dehydrated when diving? So, carry your own drink supply without the need for those silly little juice cartons (yes, you can drink from them while submerged) and have the added advantage of no extra mouthpiece to worry about as you'd have if you used something like a camelbak.

Even better, on cold dives you could use hot water!







:giggle:

[Major Clanger]

I don't see why everyone is assuming this is either a really stupid question, or a wind-up. To me it seems like a really sensible idea, especially if it's going to be used for long deco dives.

After all, who among us hasn't started to feel a little but dehydrated when diving? So, carry your own drink supply without the need for those silly little juice cartons (yes, you can drink from them while submerged) and have the added advantage of no extra mouthpiece to worry about as you'd have if you used something like a camelbak.

Even better, on cold dives you could use hot water!







:giggle:

Why carry it in something when you're surrounded by the stuff :party:

[Hickdive]

I don't see why everyone is assuming this is either a really stupid question, or a wind-up. To me it seems like a really sensible idea, especially if it's going to be used for long deco dives.

After all, who among us hasn't started to feel a little but dehydrated when diving? So, carry your own drink supply without the need for those silly little juice cartons (yes, you can drink from them while submerged) and have the added advantage of no extra mouthpiece to worry about as you'd have if you used something like a camelbak.

:giggle:

Dehydrated? Yes.

Silly little juice cartons? No.

Camelbak? No.

This is what you need;

http://thumbs2.ebaystatic.com/d/l225/m/mlNUAUFvaE-6RdbS9OUzeNw.jpg

[MarkP]

Dehydrated? Yes.

Silly little juice cartons? No.

Camelbak? No.

This is what you need;

http://thumbs2.ebaystatic.com/d/l225/m/mlNUAUFvaE-6RdbS9OUzeNw.jpgPure bilge*.

Who'd want a shite blend when Lagavulin exists?

*That's exactly what I think of Teachers**.

**The shite blend, not educators.

[Hickdive]

Pure bilge*.

Who'd want a shite blend when Lagavulin exists?

*That's exactly what I think of Teachers**.

**The shite blend, not educators.

You'd ruin an Islay by drinking it under sea water? You can't make Teacher's any worse.

[jturner]

You'd ruin an Islay by drinking it under sea water? You can't make Teacher's any worse.

Hmmm.. Lagavulin! For that I'd dive with a habitat (the device, not the shop), complete with comfy, padded armchairs and a nice open fire. It would be a nightmare to drag it all to the bottom and then dry out the chairs but worth it!


Better get the disclaimer in: Hey, kids! Stay in school/don't do drugs/don't drink and dive/don't attempt to have an open fire underwater & in an oxygen enriched environment.

[Hickdive]

Hmmm.. Lagavulin! For that I'd dive with a habitat (the device, not the shop), complete with comfy, padded armchairs and a nice open fire. It would be a nightmare to drag it all to the bottom and then dry out the chairs but worth it!

Believe me, it was! But I left out the open fire for safety reasons;

http://media.carbonated.tv/91463_story__02.JPG

[6fathoms]

Believe me, it was! But I left out the open fire for safety reasons;

http://media.carbonated.tv/91463_story__02.JPG

I could actually live there, it looks awesome, everything you need.

[Mr Flibble]

Best to light the open fire before entering the water. The last time I tried to start a fire underwater my matches got all wet and wouldn't ignite. :s:

[londonsean69]

Best to light the open fire before entering the water. The last time I tried to start a fire underwater my matches got all wet and wouldn't ignite. :s:

We actually took a guy in on a DSD, once back on the beach he reached into his wetsuit and pulled out a verry soggy pack of smokes, and a drowned lighter.

It was beyond his comprehension how they had got wet inside a wetsuit. Thick ☺☺☺☺.

[rockinrobin]

We actually took a guy in on a DSD, once back on the beach he reached into his wetsuit and pulled out a verry soggy pack of smokes, and a drowned lighter.

It was beyond his comprehension how they had got wet inside a wetsuit. Thick ☺☺☺☺.

On my first date with my now wife, we went diving. I'd been out on a dive in the morning and I picked her up from work for the afternoon dive. As I usually do, I'd tucked my neoprene wallet into my wetsuit (which was top down and tied around my waist). We got to the car park, suited up and went on the dive. Only when I took my kit off to get changed did I realise that I'd left my wallet inside my wetsuit during the dive. It may well have been OK to keep moisture off the contents on land, but it didn't have a hope in hell underwater.

We ended up in an Indian later that evening and I had to dry out a load of notes on the food warmer as they'd got soaked during the dive and I didn't have any cards with me.

Is there anyone that makes a wallet with a dry-zip?

[Hickdive]

Best to light the open fire before entering the water. The last time I tried to start a fire underwater my matches got all wet and wouldn't ignite. :s:

Oh I'd figured that out already. No, the big safety problem was getting it into the habitat without burning my hands.