runsongas
Contributor
yes, because they still need to know it is an exemption 9791 tank. if you don't have that, they can refuse to test the tank as you don't have evidence of it conforming to a current valid DOT spec.
Restoring tank markings
- Thread starter guruboy
- Start date
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lv2dive
Formerly known as KatePNAtl
You can't change the markings but you can remove the paint - the state of the paint is obscuring the markings. If you remove the current paint and then paint just over the markings you want readable, in a bright color, those markings should be easily visible.
I'm sure someone will jump on and say that's against some rule/reg but I've seen it countless times down here in cave country.
I'm sure someone will jump on and say that's against some rule/reg but I've seen it countless times down here in cave country.
lv2dive
Formerly known as KatePNAtl
PS I wouldn't worry about hydro tests-if they don't know how to figure it out you have bigger problems.
OP
I'm sure they could figure it out. Just don't want it condemned for something stupid like illegibility in 5 years.
OP
These are Genesis HP100 3500psi tanks made 89. E9791 stamp should make them PST. Also has "galvanized" stamped on them.
Will paint stripper remove the galvanized layer?
Will paint stripper remove the galvanized layer?
runsongas
Contributor
no, it shouldn't. i would use a plastic scraper though. a steel scraper can grind/shave off the layer if you really go to town
2airishuman
Contributor
I have had one cylinder sandblasted, and a side effect was to make the cylinder markings more legible.
A power wire brush may help. The steel in any cylinder is hard and tough enough that the wire brush won't damage it.
Paint stripper will not affect the galvanizing
A power wire brush may help. The steel in any cylinder is hard and tough enough that the wire brush won't damage it.
Paint stripper will not affect the galvanizing
I am no expert in steel tanks, but am an expert in steel. It looks to me that you have some oxidation. I avoid chemicals on steel to avoid the risk of hydrogen embrittlement. I would use a brass or SS brush to clean of the oxidation, and a light fluff n buff grind if needed. This should remove the oxidation protrusions from the tank and leave the stampings. Follow up with some appropriate paint.
OP
What is oxidizing? Is the galvanized finish eroded?
It looks like mostly white rust, which is caused by the zinc oxidizing in the galvanized coating. White rust leads to red rust eventually. If you google white rust you can find some photos that show similar appearances.
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