Spray on foam insulation for exposed dump lines?
Might that help keep things from freezing? With or with out a heated line inside it? Might it be a bad Ideal to run an electric heat line inside that? Is it flammable?
Forum Discussion
Without some form of heat on the warm side of the insulation, all you'll be doing is slowing how long it takes the two temperatures to equalize. I'd do the heat tape (on the outside of the pipe) then insulation, saran wrap in between if you're using a spray on foam. If you can find a pipe insulation the right size a tie wrap every few inches should keep it from blowing off on the road. You cold also use the insulation they sell to wrap over the heat tape, also secured with abundant tie wraps.
