It depends on the beer itself as well as the temperature of the beer.
The simple answer - anything above 12-14 PSI will begin to overcarbonate a keg.
I'm just guessing here but I suppose that running too little pressure in a 120ft coil system would cause problems as well because 15 PSI at the keg is not going to be 15 PSI at the faucet - much less in fact - and there could be problem with the carbonation coming out of the beer as it leaves the faucet (foam).
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