AFAIK, you wouldn't necessarily replace a CNG tank unless it failed the pressure test on recertification or it has a mandatory replacement date stamped on it somewhere. Trick is finding a recert company. Maybe one of the propane tank refill outfits? The transport company I worked for has vans that are 20+ years old and are too cheap to replace tanks.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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