After replacing a section of water main, what is the first procedure that must be carried out?

The first procedure that must be carried out after replacing a section of water main is pressure testing. This step is critical because it ensures that the newly installed section can withstand operational pressures without any leaks or failures. Pressure testing helps to confirm the integrity of the joints and the overall structural soundness of the water main.

By applying a specific amount of pressure, typically higher than normal operating conditions, operators can detect any weaknesses in the system. It is essential to accomplish this before disinfection, flushing, or taking water samples because any failure discovered during these subsequent steps could compromise the safety and functionality of the entire water distribution system. In addition, if the system does not pass the pressure test, it would require attention and possible repair before any further procedures could be safely conducted, ensuring that water quality standards are maintained throughout the process.