To prevent collapse of the borehole walls in unstable rocks used casing pipe. In the case where the pipe will be left in the borehole, it is advisable to use a cheaper brand of steel 20 with the connection type pipe in pipe.
External diameter - 168 mm
The internal diameter is 156 mm
The wall thickness - 6 mm
Pipe length from 1 to 5 meters in agreement.
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