What is the required psi for a rough-in test on the water distribution system and the water service piping?

In plumbing, a rough-in test is crucial for ensuring the integrity of the water distribution system and service piping before they are covered by finishes and fixtures. The required psi for such tests is based on codes and standards designed to verify that the system can withstand normal operational pressures without leaking.

Selecting the maximum working pressure as the testing standard is essential because it accurately reflects the conditions the system will face during regular use. By testing at this level, plumbers can identify any potential weaknesses or leaks that might not be apparent at lower pressures, ensuring a safer and more reliable plumbing installation.

Other provided choices, namely specific psi values like 50, 75, and 100, do not necessarily align with the maximum working pressure required for comprehensive safety assessments. These figures may be suitable for other specific testing scenarios, but they do not encompass the complete scope of what is necessary for a thorough rough-in test across most systems. Thus, adhering to the standard of not less than maximum working pressure ensures that the testing is exhaustive and compliant with prevailing plumbing codes.