According to regulations, what is the minimum psi pressure rating for pipe and fittings used in wastewater pressure mains?

The minimum psi pressure rating for pipe and fittings used in wastewater pressure mains is established to ensure the integrity and reliability of the system under various operational conditions. The correct answer, 150 psi, represents a standard that accounts for potential pressures that might occur in pressure mains, including surges and temporary increases. This rating is designed to provide an adequate safety margin, reducing the risk of leaks or failures in the system which could lead to contamination or service disruptions.

In wastewater applications, maintaining essential pressure is crucial for transporting effluent and preventing backflow or other system failures. A rating of 150 psi enables the system to withstand the dynamic pressures experienced during normal operation and unusual conditions, ensuring long-term durability and reliability.

Options like 100 psi, 125 psi, and 200 psi may not meet the necessary requirements for safety and operational efficiency in wastewater systems. Lower pressures may be inadequate for certain applications, while excessively high pressures, such as 200 psi, could lead to unnecessary costs and increased risk of pipe failure due to overly stringent operating conditions. Thus, 150 psi serves as a practical and effective standard for wastewater pressure mains.