Georgia Septic Installer Practice Test

What material should meet ASTM standard 2665 for septic systems?

1. PVC pipe, Type I schedule 60

2. PVC pipe, Type I schedule 40

3. PVC pipe, Type II schedule 40

4. PVC pipe, Type III schedule 80

The correct answer is: PVC pipe, Type I schedule 40

The correct answer is based on the specific requirements for PVC pipe used in septic systems, as outlined by ASTM standard 2665. This standard encompasses the specifications for PVC pipe intended for use in sewer systems, drainage, and certain wastewater applications. PVC pipe, Type I schedule 40, is specifically designed to handle the pressures and conditions typically found in septic system applications. Type I signifies the material's classification, which has a higher tensile strength compared to other types of PVC. The schedule classification indicates the wall thickness of the pipe, and schedule 40 is a commonly used thickness that balances strength with cost and weight, making it suitable for residential and commercial septic systems. While other types of PVC pipe might not meet the same requirements or might be over- or under-engineered for septic system applications, Type I schedule 40 offers the right combination of structural integrity and flexibility necessary for effective and safe operation. This ensures that the material can withstand the environmental conditions it will face, such as soil pressure and effluent flow, thus preventing failures that could lead to leaks or system malfunctions.