Unfortunately hydro test facilities do not always think. There are many misinformed testers. Some say that the "+" is only good for the first five years and can not be hydroed and requalified with the "+". Which is untrue.You would think that with the REE number stamped on the tank, testing for the '+' rating would be trivial. The shop doesn't even have to think!
If a tank originally had a '+' rating and the REE number is well documented, there is no reason in the world for a hydro test facility to not test for it. The tank may not pass the '+' test but that's a different story.
Richard
Another hydro center said they would not hydro test the tank and qualify it with a plus because someone filling the tank my not know what they are doing and may over fill the tank by 50%. Now I ask you is that some crazy reasoning as why they shouln't hydro the tank with a "+".
Other hydro facilities will not do the "+" because it requires different paper work and they don't want to be bothered. I had called about 15 hydro centers and they all refused to do the plus.