How to protect the fire hydrant in winter?
The north is underground type fire hydrant, and there is heating and heating pipes in each section. The water is heated and will not freeze. The temperature in the south is high and will not freeze.
In the outdoor or underground garage water pipes should pay attention to antifreeze measures, the underground water tank can do frozen layer, look at the situation to do wall insulation. Use sanhuali antifreezing hydrant well
General automatic sprinkler systems in the North need to do some anti freeze measures.
