Georgia Septic Installer Practice Test

What is the minimum flexural strength of a polyethylene septic tank?

1. 50,000 PSI

2. 60,000 PSI

3. 80,000 PSI

4. 100,000 PSI

The correct answer is: 80,000 PSI

The minimum flexural strength of a polyethylene septic tank being 80,000 PSI is based on the material properties required to ensure structural integrity and durability in the challenging environments where these tanks are installed. Polyethylene is widely used in septic tank manufacturing due to its resistance to corrosion, chemicals, and moisture. Flexural strength refers to the ability of a material to withstand deformation under load before breaking. For septic tanks, which are often buried underground and subject to various loads from soil, groundwater, and vehicles, a flexural strength of at least 80,000 PSI ensures that the tank can maintain its shape and function effectively over time without cracking or failing. This level of strength helps prevent leaks and environmental contamination, ensuring that the septic system operates safely and efficiently. Using a material with inadequate flexural strength could lead to structural failure, which would negate the tank's purpose of containing and treating wastewater safely. Thus, the established minimum flexural strength reflects both safety standards and the longevity of the system.