Cracked Fuel Tank

[Bigcol]

thats why he said use a Mower or a motor bike for the exhaust - you have taken the tank out, so the car will not run

if you "purge" the tank with the exhaust, you are replacing all the oxygen (flammable with petrol fumes) with carbon monoxide (which is not flammable)
especially with a tank being welded

fire triangle.png

so by taking the oxygen out - you cannot have a fire

[rusty00]

All good, it can be daunting the first time.
Exhaust gas is used to remove oxygen more so then remove excess fuel.
If the oxygen is removed then there can not be an ignition of fuel.
Yes keep the purge running while welding.

YouTube has some average videos with a nutter using CO2, this is also good to use just not how it is done on the video.
There are also some sites on the net that can assist with technique.

[rusty00]

thats why he said use a Mower or a motor bike for the exhaust - you have taken the tank out, so the car will not run

if you "purge" the tank with the exhaust, you are replacing all the oxygen (flammable with petrol fumes) with carbon monoxide (which is not flammable)
especially with a tank being welded

fire triangle.png

so by taking the oxygen out - you cannot have a fire

Very good example.
I deal with liquid oxygen and cryogenic liquids at work along with LNG submersible pumps that have exposed electric motors submerged in LNG, no oxygen no problems.
Hard to believe that 415 Volts running through LNG will not ignite.
Something I drum into the guys working on LNG equipment, purge first with N2 then introduce the LNG, make sure no hydrocarbons are present with any form of high purity oxygen.

[dom14]

All good, it can be daunting the first time.
Exhaust gas is used to remove oxygen more so then remove excess fuel.
If the oxygen is removed then there can not be an ignition of fuel.
Yes keep the purge running while welding.

YouTube has some average videos with a nutter using CO2, this is also good to use just not how it is done on the video.
There are also some sites on the net that can assist with technique.

Yeah, I understand now. Once I realized the purge need to be running while the welding goes on, made sense to me.
I simply use a motor mower exhaust gas for purge. It's a good technique. It comes handy with many welding jobs similar to this.
Thanx