Georgia Septic Installer Practice Test

What is the minimum flexural modulus of elasticity for a fiberglass tank?

1. 600,000 PSI

2. 800,000 PSI

3. 1,000,000 PSI

4. 1,200,000 PSI

The correct answer is: 800,000 PSI

The minimum flexural modulus of elasticity for a fiberglass tank is a critical specification that ensures the structural integrity and durability of the tank when in use. A value of 800,000 PSI indicates that the material can withstand significant bending without deforming excessively, which is essential for maintaining the tank's shape and function, especially under load or pressure. Fiberglass is chosen for its strength-to-weight ratio and corrosion resistance, making it suitable for septic applications where it will be exposed to various chemicals and environmental conditions. Having a flexural modulus of elasticity of 800,000 PSI is a benchmark that ensures the material can support operational stresses and resist cracking, which could lead to leaks or failure. Values above or below this threshold may either imply a material that is unnecessarily strong and potentially more expensive or a material that is too weak to ensure reliability and safety, respectively. Hence, the specification of 800,000 PSI is ideal for ensuring that fiberglass tanks perform adequately in real-world installations while adhering to industry standards and guidelines.