Here is the story...
I have a high pressure steel tank. I brought it to a shop to get it visually inspected. They inspected it and filled it with Nitrox. Now I have a dozen tanks. It turns out I never used this tank.
Almost a year later and it is due for another visual inspection. I realize I'll probably never use it. So I decide to sell it. We open it up and look inside. It has a light coating of rust over the inside of the tank. I cannot see any pitting but the entire inside is definitely coated with an iron oxide, i.e. rust.
My question, is this normal?
I've been reading a few threads on here about flash rust and making sure you dry out the cylinder before you put the valve back on. Could this happen because the shop didn't dry the cylinder enough? Could it be because it was humid in the dive shop and that was enough to cause the tank to develop rust?
I have 4 other steel tanks this shop visually inspected. Could there be rust in them as well? Should I be concerned?
TIA.
I have a high pressure steel tank. I brought it to a shop to get it visually inspected. They inspected it and filled it with Nitrox. Now I have a dozen tanks. It turns out I never used this tank.
Almost a year later and it is due for another visual inspection. I realize I'll probably never use it. So I decide to sell it. We open it up and look inside. It has a light coating of rust over the inside of the tank. I cannot see any pitting but the entire inside is definitely coated with an iron oxide, i.e. rust.
My question, is this normal?
I've been reading a few threads on here about flash rust and making sure you dry out the cylinder before you put the valve back on. Could this happen because the shop didn't dry the cylinder enough? Could it be because it was humid in the dive shop and that was enough to cause the tank to develop rust?
I have 4 other steel tanks this shop visually inspected. Could there be rust in them as well? Should I be concerned?
TIA.