Quote:
Originally Posted by hhmoore
To the people that have commented on the use of "old" heat tape - what is the shelf life of that product? The original comment stated that the tape was several years old, sitting in a roll in his house...no implication of previous use (IMO, meaning it is for all practical purposes - new).
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I am not sure there is going to be a definitive answer to this question, to be honest. When my brother was plumbing he advised clients to replace their tape every 10 years. Keep in mind this is tape used as designed, only turning on for short periods of time to keep pipes from freezing. Used more or less constantly the life span may be less, or it may be longer. I have had one cage I made back in '96 that has the original tape, still works. I wonder if the on/off hot/cold cycle fatigues the materials faster than steady load does?
In my experience when tape fails it just stops working, it doesn't pose a hazard, others may have a different experience.
In my opinion the amount of time tape sits on a shelf does not affect its shelf life, there is no degrading of materials unless the product was exposed to conditions that could degrade it, chemicals, extreme temperature fluctuations, etc.
In this case, going by the descriptions, it sounds like the tape was simply not installed properly, and if it shorts out or breaks I would look to that cause rather than how old it is.
Personally I started to move away from heat tape some time ago, I just don't like it as much as I do other materials.