What is the design intent of using a steel casing in a well? I'm specifically talking about basic corrosion performance. How do casings stand up to the constant rise and fall of water within the well as well as condensation that forms on the inside face of the well cap in the winter. It would seem like you'd certainly get corrosion byproducts in the water all the time as the casing degrades.
I have a 6" diameter, 120' deep well with a casing that goes to 63'. 14' clay, and the remainder is limestone. Water level goes from 16', and during it's initial 30minute yield test, the water went to 100'. So the casing is well within the normal water level variance.
I have a 6" diameter, 120' deep well with a casing that goes to 63'. 14' clay, and the remainder is limestone. Water level goes from 16', and during it's initial 30minute yield test, the water went to 100'. So the casing is well within the normal water level variance.
Steel casing will rust very badly at or above the static water line. When it parts, that is usually where it happens. Steel is used for casing because it is strong enough not to break if the ground or rocks shift a bit, or when working deeper than the limits of PVC casing. All of which would snap off PVC casing. But PVC casing is used in a lot of areas where the ground doesn't shift. Generally Stainless Steel casing is so expensive, it is preferred to use thick wall steel pipe when rigidity is needed. They may even use a Stainless Screen on the bottom of the steel casing. The thick wall means it will take some time for steel casing to rust through, but it eventually will. 
