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Bloody cold!

PaulBuz - 6/1/03 at 04:14 PM

Is it just me or is anyone else's MIG gas supply pressure very low in this cold spell?

ijohnston99 - 6/1/03 at 04:28 PM

Not noticed any issues with that. Just don't lick the chassis!!

interestedparty - 6/1/03 at 05:15 PM

quote:
Originally posted by PaulBuz
Is it just me or is anyone else's MIG gas supply pressure very low in this cold spell?

Cold should certainly affect the amount of gas that can be delivered, due to the cylinder being unable to recover the latent heat of evaporation, used when the gas is released, from its surroundings. If it's getting to be a problem, stand the cylinder in a bowl of warm water

John

jollygreengiant - 6/1/03 at 07:42 PM

Std PVT (Pressure Volume Temperature ) relationship sorry lads but thats what happens when things get cold. Or havn't you noticed that its smaller when cold.

Enjoy

interestedparty - 6/1/03 at 08:33 PM

quote:
Originally posted by jollygreengiant
Std PVT (Pressure Volume Temperature ) relationship sorry lads but thats what happens when things get cold.

It's absolutely true that if the volume remains unchanged, then the pressure of a gas will decrease with decreases in temperature. However, the reason why the flow from a cylinder of compressed gas (which will of course be liquid or solid) is because of the inability of the cylinder to replace the heat lost (latent heat of evaporation) from its surroundings. The effect can be clearly seen when a cylinder loses considerable gas from a leak, it will often be coated with condensation or even ice

John

Wadders - 6/1/03 at 09:14 PM

interestedparty - 6/1/03 at 09:23 PM

quote:
Originally posted by Wadders
You could try wrapping your anorak round it,that might help

That would be no good at all, you need to add heat not insulate the cylinder, either that or improve the quality of your humour

John

Wadders - 6/1/03 at 09:41 PM

That would be no good at all, you need to add heat not insulate the cylinder, either that or improve the quality of your humour

John

Sorry,I'll get me coat shall i ?

tr - 6/1/03 at 10:21 PM

This explains things adequately...

http://www.asciimation.co.nz/beer/

James - 7/1/03 at 03:19 PM

quote:
Originally posted by tr
This explains things adequately...

http://www.asciimation.co.nz/beer/

That is so feckin' cool!

Anyone got a spare turbo kicking round....

jollygreengiant - 8/1/03 at 09:43 AM

Could add a whole new meaning to quick blast round the track. At least you'd have a cold drink while you were doing it!

philgregson - 8/1/03 at 10:49 AM

I am so impressed! - it makes loads of noise and everything.

I can feel yet another unfinished project comming on - you can probably get turbochargers cheap from scrapyards can't you?

Mind you putting the exhaust through the turbo (rather than an axial compressor) and the lack of a 'proper' outlet must mean that you wouldn't get as much in the way of directable, usable thrust and the design of a turbocharger means that it would be very dificult to extract the rotational energy - makes loads of noise though.

[Edited on 8/1/03 by philgregson]

James - 8/1/03 at 11:40 AM

Did anyone ever see Jeremy Clarkson going round a park on a turbine powered biycle? I *think* it was on one of the 'Extreme Machines' shows.

AFAIR it was just a cylinder strapped behind the seat about 300mm long and 150mm diameter with just the tiniest thumb lever to control the thrust- brilliant!

James

Simon - 8/1/03 at 01:11 PM

James,

I believe you're right about Clarkson's Extreme Machines.

However, he was using a production version - something from Sophia or AMT I believe.

If it whets your appetite for alternative power, have a look at:

http://www.nyethermodynamics.com

and click on the link for Squirt 2

ATB

Simon

David Jenkins - 8/1/03 at 01:55 PM

Now I WANT one of them!

David