Freeze Protection

After this week's cold snap (low was about 7°F), we have seen quite a bit of freeze damage. The concerns with above-ground water tanks include:

1. Damage to the tank or liner.  Probably only going to happen if the whole tank freezes, as water can expand above or below the waterline.  We would need a full week of temperatures below 20 in order for that to happen.
2. Damage to pumps or piping when the ice begins to thaw.  This is more likely.
3. Damage to exterior above-ground piping.  MOST LIKELY.  But we can prevent this the same way we protect any other pipes.  Insulation and heat tape, drain, or bury.

If you have any tips for leak-free installations, please add them in the comments.