These are methods of lining pipes with a thin lining of resin (typically 1mm thick), which is sprayed onto the surface of a cleaned main. The aim of these techniques is to isolate the host pipe from the conveyed medium. There may be some potential for these techniques to be used to reinforce the structural capabilities of the host main.
The vacuum powered, resin-impregnated liner is inverted manually into the manhole and uses an inflation device to press the liner against the existing manhole wall. This contact allows for the liner to form to the shape of the manhole. During this process excess resin migrates into imperfections, where the liner is sealed and mechanically held in place.
It is not probable that homeowners in urban communities will often be troubled with frozen pipes unless they go away for several weeks and leave their home unheated during a protracted spell of freezing weather. If you are contemplating such an absence, the water should be shut off and pipes drained. But, if you should find a frozen pipe, certain steps are advisable.
Since water always wins, prevention is the best medicine, which means taking simple but effective action to make sure your pipes don't freeze and, ultimately, burst. A poorly insulated house can actually protect pipes in a sense, because the conditioned air inside the house keeps the wall cavity above from freezing. But when it gets really cold, the weather wins and the water in the pipes starts to freeze. If you don't catch it in time, that's all she wrote.