Casing Material Selection ...

Casing Material Selection

There are rare cases where materials are a problem.  For 99 percent of wells that require casing you can get by with 4inch PVC.  Hard rock wells only need a few meters of larger diameter surface casing.  Hard rock wells can be open holed below the surface casing and should not exceed a depth of more than 250 feet.   A well of this size casing can easily do 20 gallons per minute.  If cased , the pipe must be mill slotted and the annular space  backfilled with sand across the slotted pipe and clayey soil, enviroplug or siliceous Class A Portland cement in the annular space.  The siliceous Portland cement will not crack. 

 

Bill Turner

WaterBank