home-made anti-fire fogging system ?

[KellysEye]

Never put water in a dive tank, as said the compressor is designed to remove water. Also to fill a tank you need a dive licence and if it has water in it forget it. Buy a proper system and preferably use gas not fine spray.

 

[penfold]

Never put water in a dive tank, as said the compressor is designed to remove water. Also to fill a tank you need a dive licence and if it has water in it forget it. Buy a proper system and preferably use gas not fine spray.

You need a what? What is such a beast and how does it uniquely qualify someone to handle gases at high pressures? I'll grant there might be dive shops who feel the need to nanny their customers but I'm ignorant of any law on the subject; cylinders must be in test(although some shops aren't very strict about checking) but not so much the owner.

You certainly don't want water in a dive cylinder, there's enough hazard in high pressure gas handling without having corrosion in the cylinders.

 

[DinghyMan]

You need a what? What is such a beast and how does it uniquely qualify someone to handle gases at high pressures? I'll grant there might be dive shops who feel the need to nanny their customers but I'm ignorant of any law on the subject; cylinders must be in test(although some shops aren't very strict about checking) but not so much the owner.

You certainly don't want water in a dive cylinder, there's enough hazard in high pressure gas handling without having corrosion in the cylinders.

As far as I am aware you are correct - when I did my gas blenders course there was plenty about the H&S rules but there is no law that requires you to have any quals other than being "competent" and there is no such thing as a "dive licence". In the UK you can go buy some dive kit and jump in the water with no quals at all, and you won't be asked for any paperwork when you take your cylinder for a fill if all you want is air as the cylinder has its test info on it and that is all that is required.

I imagined that a SCUBA tank half filled with water and then pressurised to 3000psi would be used. You would need to use an Ali tank to avoid rust.
This would be piped at 3000PSI to a spray head with a wax seal that would melt wiith heat. Or use a manual valve. I would imagine the water would be expelled over perhaps 1 minute. No air would be expelled until the water was emptied. There would be a pressure drop of half or a doubling of the air volume over 1 minute which I don't think would cause significant cooling as to ice the system. anyway just a thought olewill

An ally tank with water in will corrode and putting a 230/300bar cylinder near to a fire would be suicidal. Open a cylinder valve fully open and you will get ice forming on the valve, spraying water about will just increase the amount and speed of ice forming.

Have a read of http://www.nigelhewitt.co.uk/diving/maths/tank.html to see just how much energy is stored in a filled scuba tank; it simplifies down to "In metric units the tank contains the energy in 300 grams of TNT. A normal hand grenade has about 150 grams." for a 12 litre cylinder so on a normal dive that's 4 hand grenades for the ones on my back and another 1.5 to 3 for the one or two at my side!!

 

[KellysEye]

>to fill a tank you need a dive licence
>>You need a what? What is such a beast and how does it uniquely qualify someone to handle gases at high pressures?

I can assure you need to show a PADI or BASC certificate before a dive shop will fill your tank. This is to ensure those not qualified to dive can't fill a tank. Have you ever been diving, if you have you should know that?

 

[Vara]

I played with using a normal garden sprayer set to very fine spray,as a fire extinguisher, surprisingly effective on wood and paper, didn't try it on a diesel fire.

One like this;

http://www.screwfix.com/p/pressure-...racking url &gclid=CLSVhsXS-70CFXGWtAodRSEAQw

 

[Graham_Wright]

>to fill a tank you need a dive licence
>>You need a what? What is such a beast and how does it uniquely qualify someone to handle gases at high pressures?

I can assure you need to show a PADI or BASC certificate before a dive shop will fill your tank. This is to ensure those not qualified to dive can't fill a tank. Have you ever been diving, if you have you should know that?

Nonsense!

BSAC and PADI.

 

[DinghyMan]

>to fill a tank you need a dive licence
>>You need a what? What is such a beast and how does it uniquely qualify someone to handle gases at high pressures?

I can assure you need to show a PADI or BASC certificate before a dive shop will fill your tank. This is to ensure those not qualified to dive can't fill a tank. Have you ever been diving, if you have you should know that?

As it says above: this is incorrect, there is no requirement to show any documentation for the user when getting a fill, there is only a requirement for the cylinder

BSAC Assistant Instructor & Qualified Trimix Blender

 

[jerrytug]

>to fill a tank you need a dive licence
>>You need a what? What is such a beast and how does it uniquely qualify someone to handle gases at high pressures?

I can assure you need to show a PADI or BASC certificate before a dive shop will fill your tank. This is to ensure those not qualified to dive can't fill a tank. Have you ever been diving, if you have you should know that?

No, there are thousands of air rifle users who get dive bottles filled.