I probably know the answer but I'll ask anyway. I have a floor drain in my shop that tends to freeze. Melting snow etc just makes an annoying puddle. The drain is in concrete and just runs outside the shop wall and empties on the ground. Ii is covered by a 1/2 barrel outside so it's not packed under snow. I don't feel like digging out 4 feet of snow to use a hair dryer on it. Can I run a heat tape inside the pipe? Any other ideas to keep it from freezing? Its 2" black PVC. Not sure how deep since was here when i bought the house.