Texas Commission on Environmental Quality (TCEQ). Class C Water License Exam

When pressure testing water mains, the test pressure should be:

1. Equal to the normal operating psi

2. Up to twice the normal operating psi

3. 1 1/2 times as great as the normal operating psi

4. 1/2 times the normal operating psi

The correct answer is: 1 1/2 times as great as the normal operating psi

The appropriate test pressure for pressure testing water mains is specified to be 1 1/2 times the normal operating psi. This standard is in place to ensure the integrity and strength of the water main under conditions that exceed normal operating pressure. By applying a pressure that is higher than what the system would typically experience, you can effectively assess the structural soundness of the pipes and fittings. This helps identify any weaknesses or potential leaks that may not be apparent under normal operating conditions. Using 1 1/2 times normal operating psi strikes a balance between safety and practicality, ensuring that the test is rigorous enough to predict how the system will perform under unusual stress without being excessively high, which could risk damaging the infrastructure during testing. It's essential for maintaining the overall reliability and functionality of the water distribution system. Other suggested test pressures, such as normal operating psi or half of it, would not sufficiently challenge the system to reveal potential issues. Testing at twice the normal operating psi might place unnecessary strain on the water main and could lead to damage, making 1 1/2 times the appropriate standard.