Quick Answer
A recommended thickness for steel casing for wells is 1/2 inch (12.7 mm) to 5/8 inch (15.9 mm) for shallow wells, and 3/4 inch (19.1 mm) to 1 inch (25.4 mm) or more for deeper wells.
Recommended Casing Thickness for Shallow Wells
The American Water Works Association (AWWA) recommends a minimum casing thickness of 1/2 inch (12.7 mm) for shallow wells, typically up to 100 feet deep. This thickness provides sufficient strength and durability to withstand the internal water pressure and external soil loads. It is essential to check local regulations and well construction standards for specific requirements.
Casing Thickness for Deeper Wells
For deeper wells, a thicker casing is necessary to prevent deformation and collapse under the increased internal water pressure and external soil loads. A casing thickness of 3/4 inch (19.1 mm) to 1 inch (25.4 mm) or more is recommended for wells deeper than 100 feet. This thickness also provides better resistance to corrosion and damage from surrounding soil and rock.
Casing Material and Additional Requirements
When selecting steel casing for wells, it is crucial to consider the material properties, such as yield strength, tensile strength, and elongation at break. Look for casing materials that meet or exceed the AWWA C200 standard for steel water pipe, which requires a minimum yield strength of 30,000 pounds per square inch (psi). Additionally, ensure that the casing is properly coated or lined to prevent corrosion and ensure a watertight seal.
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