Nuclear Orange?

[jamhass]

For what's it's worth:

I have, quite safely and successfully, gas welded gasoline tanks by running auto exhaust through the tank. The exhaust will not support combustion or explosions. Should work just fine on diesel tanks.

Had I had TIG available, yes, I would have used Argon.

[SailRN]

Originally Posted by Dsanduril

While diesel is safer than gasoline, the way we've always inerted tanks is to drop a chunk of dry ice into the tank. As it sublimes it fills the tank with heavier-than-air CO2 and a chunk of the right size will continue to maintain the inert state while cutting and introducing air.

As mentioned above, with any inerting gas you have to have a plan for what happens in the breathing space.

That's a super idea! I'd thought of using a pressure bottle of CO2 from a beverage company, but your idea is much better.