Acceptable amount of rust?

[Scared Silly]

As others have said, flash rust. However, instead of a tumble I prefer a light whipping.

 

[fmerkel]

As others have said, flash rust. However, instead of a tumble I prefer a light whipping.

I personally prefer to whip the tank.

 

[Bob DBF]

I say whip it
Whip it good
I say whip it
Whip it good


Devo

 

[halocline]

However, instead of a tumble I prefer a light whipping.

You're into that sort of thing, huh?

 

[NAM001]

To the OP I have a book that talks about it. flash rust is not a problem. perhaps whipping the tank instead of tumbling is all the is required. When ever I have a tank that has been wet I fill and vent 3 times to 500 psi to remove the moisture. Our humidity here is often in the 90's so a fill to 500 and vent and repeated will remove that moisture by 500 psi is 30+ bar so 2 cyvcles will remove the moisture buty a factor of 30 on each fill to 500.twwice will be a reduction of about 1/900 th of what was there before the valve was put on. Nitrogen does it even better but not necessary.

 

[WarrenZ]

I found a better way just invert the tank and fill with Helium then place in a corner with the tank boot resting against the ceiling and a bucket under the tank to catch the drips when the tank has dried internally you can pull the tank down and then reinstall the valve and fill normally or while tank is still floating against the ceiling you can spin on the valve and retain the helium. just be careful that the tank cant wander out the door and float away.




Now that I have gotten that out of the way I usually rinse my tanks upside down and then blast with clean dry air from another tank I do not use a tank that has any visible rust when I go to put on the valve if I have to tumble a second time I will.