Internal tank lining?

[MisterEd437]

I’m building a hookah system (no oil compressors) but was wondering if there was any product that can be used to coat the inside of the three tanks I’m using to store air. There are two 3 gallon tanks that are steel and store the initial air coming out of the 12v compressors. The third tank is 4 gallons, made of aluminum and floats in the water to cool the incoming air from the two compressors, this tank feeds the diver. I know they make a ceramic liquid used to coat the inside of motorcycle gas tanks but can find nothing about the breathability of this coating. Wondering if anyone knows of a safe product to use?

The air intake for the compressors is run through carbon filters followed up by each having their own moisture filer which is rated at 5 micron for particulates. There is another 5 micron filter 3’ from the regulator for addition protection from any debris in the breathable approved hose.

 

[tmassey]

I’m not familiar with the products you’re talking about, but I can say this: in the 1970s, scuba tank manufacturers experimented with liners. They were singularly bad ideas, they quit using them, and today tanks that have the linings are pretty much reviled (hated). If people don’t just straight-up scrap them, they spend a lot of time and effort grinding out the lining to get back to the raw steel.

Basically, you need to make sure the air going into those tanks is clean and dry. Not because of the tanks, but because as a SCUBA Diver, you need to be diving and breathing clean and dry air.

So, if you put the work into supplying clean and dry air to the diver, the tanks get clean and dry air for free. Do yourself a favor: fix your air supply, not the tanks.

ETA: if the air going into your tanks is so bad as to require a lining for the tanks, do you really want to be breathing that air?

 

[tursiops]

Why do you need to coat the tanks on the inside? Steel tanks are commonly used today for scuba with no coating.

 

[MisterEd437]

Why do you need to coat the tanks on the inside? Steel tanks are commonly used today for scuba with no coating.

Scuba tanks are of a higher quality than air compressor tanks. Even after cleaning, I though a nice coating would help eliminate any issues.

 

[tursiops]

Scuba tanks are of a higher quality than air compressor tanks. Even after cleaning, I though a nice coating would help eliminate any issues.

That's what scuba tank manufacturers thought many years ago, too. They don't do it any more. Caused more problems than it might have solved.

 

[Invader]

It used to trap corrosion beneath any tiny issue in the coating, preventing the air from drying it out. I just cleaned out 7 LP72s of liners. What was underneath was mildly concerning if it was left alone.