Huh.. well I don't know what to think about it really. Given those facts it doesn't sound dangerous. If some bottles like ASTM are never tested then why are others required to be tested?
DOT Temporarily allowing fills in Out of Hydro Cylinders due to COVID 19
- Thread starter akdeepdiver
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Because ASTM vessels are built like tanks to handle a large amount of corrosion before they are even close to failing. And in some applications they are far too large to fill with water and put into another vessel for hydro testing. If you could even remove it from the installation in the first place - like the air tanks inside a submarine. You couldn't walk with a 100cf ASTM cylinder on your back (and your BC wouldn't float you either)
Propane cylinders are only inspected and tested every 12 years. Star cylinders every 10 years, ASTM cylinders and vessels are never hydrotested. Scuba cylinders every 5 years. Carbon fiber SCBAs every 3 years (with 15 year lifespan). Different cylinders have different testing regimes because they are built differently, have different lives in service, and there are different consequences should one fail.
runsongas
Contributor
ASTM vessels can be tested ultrasonically in place as an alternative to hydro
They can, but its not a legal requirement to do that in order to remain in service.
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