Re: [CAD_CAM_EDM_DRO] Re[2]: Q:Selecting workshop heater

When any sort of hydrocarbon under pressure in a cylinder begins to burn
straight from the tank (And many won't burn inside the tank because they
will not burn over a certain concentration) you do not fire a jet of water
at it, a hose is definitly out of the question. You spray a MIST over the
cylinder to prevent massive localised temperature differences on the tank.
If you cover as much of the tank in mist as you can the tank cools more
evenly and there is a much lower risk of a piece of it repturing. I think
you're missing the other point which every gas cylinder supply, and every
human on Earth would know instinctively. Why aren't you already running if
it's on fire? Who cares is the cylinder blows half your house to pieces so
long as it doesn't include you? It will be covered on the insurance anyway,
otherwise you shouldn't have it in the first place. You DO NOT try to put
out cylinders by yourself. When the fire brigade arrives at places full of
cylinders like gas suppliers I very much doubt they run in hoses in hand and
try to put them out. When the cylinders explode they can propel themselves
literally like small shells.

The best idea I could think of using at home was one of those things for
auto-watering your garden and when the cylinders got too hot it bursts some
sort of pipe (Like in a sprinkler) that would open the water supply to a
bunch of those misters you can buy for them (For watering really delicate
flower beds). That way there is a nice fine mist of water, not a jet or
large droplets as a sprinkle puts out. Srinklers for fires rarely spray
down, they spray outwards. The misters spray directly down.

The chances of a cylinder ever actually exploding are minimal to say the
very least. It does happen but thinking practically, if you have an arrestor
on the tank the chances are well into the 90's that a burnback will ever
even reach the tanks, let alone ignite it's contents. Better still, use a
one way valve on the line as well, it's about 50p more. Propane cylinders
are often used inside the house with almost no risk at all. Infact they sell
heaters here that have a propane tank in the back for putting inside your
house or shop. Not industrial heaters, just ones for when it's freezing and
you don't want to heat the whole house. If you were to connect a 5m hose to
the tank and have the heater 4.5m away or something there is no way it's
going to melt the tank or light it from there. In the words of my BOC
supplier's empolyee when I go for my Oxy/Acetylene tanks 'It's only as
dangerous as the person using it.'

John H.