DIY gas work = DIE gas work

[rogerthebodger]

If the gas pipe was heated by fire it would explode

Just heating an enclosed pipe of gas up to the temperature that the solder would melt would not cause an explosion as there would be no oxygen inside the pipe to cause the reaction.

Remember the fire triangle fuel, oxygen and heat.

 

[sailorman]

Just heating an enclosed pipe of gas up to the temperature that the solder would melt would not cause an explosion as there would be no oxygen inside the pipe to cause the reaction.

Remember the fire triangle fuel, oxygen and heat.

gas cylinders manage to explode when heated

 

[rogerthebodger]

gas cylinders manage to explode when heated

Yes but the temperature is much higher and that is due to over pressure of the cylinder not the 200-300 C that solder will melt.

 

[sailorman]

Yes but the temperature is much higher and that is due to over pressure of the cylinder not the 200-300 C that solder will melt.

wont the pipe get "over pressured" too

 

[AngusMcDoon]

wont the pipe get "over pressured" too

The lowness of the pressure (28 mBar, less than half a kitten burp) on the low pressure side means that it could increase by a large factor and still be within the maximum pressure the pipe can take. Cylinders on the other hand have a much higher pressure to start with.

 

[rogerthebodger]

wont the pipe get "over pressured" too

If the temperature went high enough but by then the solder would have melted and the gas would leak out any way.

One of the reasons of using steel pipe is that the bursting pressure of 1/2" sched 40 pipe is over 10 000 psi and 3/8" the size I used is even higher. Having a steel hulled boat also comes into play.

 

[rogerthebodger]

Cylinders on the other hand have a much higher pressure to start with.

Which contain the gas in liquid form which would evaporate into more gas when heated increasing the pressure by a very high factor.

No liquid in the pipe anyway

 

[JumbleDuck]

Which contain the gas in liquid form which would evaporate into more gas when heated increasing the pressure by a very high factor.

Only until 96.7C and 42 bar, at which point propane reaches its critical point, which means that it no long has liquid and gaseous phases. After that pressure rises much more slowly - and in any case 42 bar isonly about four times the saturation pressure at 25C, so any tank out to be able to take it. I have seen a couple of propane cylinders which burst in a fire (at Crinan Boats, years ago). In both cases the softended metal yielded, forming rather pretty blisters about the size of a grapefruit, which then split. No tank explosion, though of course the escaping propane would have made life interesting.

 

[JumbleDuck]

gas cylinders manage to explode when heated

Propane tanks may burst and leak, but I don't think they are likely to explode. The gas cylinders which cause real concern in fires are acetylene ones, because at a suitable and not terribly high temperature and pressure it will very violently decompose into hydrogen and carbon - no oxygen required. Kaboom.

 

[DavidGrieves]

Must be a very big manometer, or is it mercury?

It's not mercury, about 18 inches long and measures up to 30millibar so can just cope with 28millibar on a butane system. Think it cost less than £20 a couple of years ago.

 

[VicMallows]

It's not mercury, about 18 inches long and measures up to 30millibar so can just cope with 28millibar on a butane system. Think it cost less than £20 a couple of years ago.

A couple of meters of clear plastic tube costs a lot less. You probably already own a tape measure. Doesn't look so professional though.

 

[saltylegs]

Quote Originally Posted by LittleShip View Post
I just love the word professional .......

Professional footballer, lawyer, solicitor, fisherman, groundsman ect ect. It means somebody is getting paid to provide a certain task. After all a hooker is a professional person.

I always thought that tradesmen where always called that TRADESMEN. Which meant they were trained in a specific practice...... but thinking about it, we no longer have tradesmen as in time served. Mine was 7 years in total and I was alway proud to call myself that, a tradesman, time served and indentured.

Tom.

thats 2 of us then

That's 3 of us then, 4 years apprenticed then the last 29 years working with LPG. :encouragement:

 

[sailorman]

Quote Originally Posted by LittleShip View Post
I just love the word professional .......

Professional footballer, lawyer, solicitor, fisherman, groundsman ect ect. It means somebody is getting paid to provide a certain task. After all a hooker is a professional person.

I always thought that tradesmen where always called that TRADESMEN. Which meant they were trained in a specific practice...... but thinking about it, we no longer have tradesmen as in time served. Mine was 7 years in total and I was alway proud to call myself that, a tradesman, time served and indentured.

Tom.



That's 3 of us then, 4 years apprenticed then the last 29 years working with LPG. :encouragement:

Me a Joiner ( wood)
but putting gas in boats for 40 yrs

 

[LittleShip]

Me a Joiner ( wood)
but putting gas in boats for 40 yrs

Don't worry about that, I've been doing woodwork for decades now ind I'm as good at it as any time served chippie.

Tom ???