Quick Answer
PVC casings are generally more prone to cracking than steel due to their brittle nature and susceptibility to damage from environmental factors such as sunlight, extreme temperatures, and microbial growth.
PVC Casing Limitations
PVC casings have a maximum working pressure rating of 150 psi (1.03 MPa), whereas steel casings can withstand pressures of up to 200 psi (1.38 MPa) or more. PVC casings also have a higher coefficient of thermal expansion, which can cause them to crack or deform under temperature fluctuations. This makes PVC casings less suitable for deep well applications where temperature changes are more pronounced.
Steel Casing Advantages
Steel casings, on the other hand, offer superior durability and resistance to environmental factors. A steel casing with a thickness of 20 gauge (0.035 in) or more can withstand the rigors of a deep well and last for decades with minimal maintenance. When selecting a steel casing, look for a material with a minimum yield strength of 30,000 psi (207 MPa) to ensure it can withstand the pressure and stress of the well. Additionally, steel casings can be coated with a corrosion-resistant material like epoxy or zinc to further enhance their lifespan.
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