Rust (streaks?) in steel tanks

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Careful with your air compressor. Those things are notorious for having wet or oily air blowing out the hose. Use a full tank or some other clean and dry air for an HP blast.
This is an underrated comment. Home air compressors spit out a "lot" of oil relative to how clean all air needs to be that enters a scuba tank.
 
So went back to the same shop. Rejected for nitrox for the flash rust. Going elsewhere and going to renew my VIP certification.
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so I did a bit more search, and found "official" recommendation for cleaning with 5% phosphoric acid, rinse with hot water, then blow dry with compressed air from a cylinder. As soon as I receive the phosphoric acid, I'll redo the cleaning and see if I can avoid all flash rust.

But I'll be taking it to a different shop. It will take a bit to set up a VIP course.
 
Not anywhere near ANY dive related equipment.
My shop compressor is as clean and as dry as any breathing air machine. Not all things are created equally.
 
My shop compressor is as clean and as dry as any breathing air machine. Not all things are created equally.

Do you have an air test that shows that? Just getting low pressure air that dry would be a real challenge.
 
Do you have an air test that shows that? Just getting low pressure air that dry would be a real challenge.
It gets tested for Grade D breathing air.
My HP compressors have a lower dew point, but it is plenty dry for scuba use.
 

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