yup, it can easily be saved, if it is not carbonated at all just re-prime the beer, [u:h1ct46sj]maybe[/u:h1ct46sj] pitch some new yeast and seal the Barrel.
i would try moving the barrel to a warmer spot first though just in case it is a case of it being too cold for your yeast, if you re-prime and the yeast have not converted the last batch of sugar it could lead to some seriously foamy beer or even blowing the pressure valve on your barrel.