What is the recommended frequency for performing a hydrostatic test on new boilers?

The best approach for determining the recommended frequency for performing a hydrostatic test on new boilers centers around the context and specific conditions under which these tests are conducted. Hydrostatic tests are typically administered to ensure the integrity and safety of the boiler system.

Conducting a hydrostatic test after turbine cleaning or repairs is essential because maintenance or repairs can introduce risks that may compromise the system's integrity. Such tests help to verify that the boiler remains watertight and that no leaks are present following any significant work that might affect its structural reliability.

While regular inspections and testing are necessary for overall maintenance, the focus on post-maintenance or repair situations highlights the importance of ensuring safety and operational readiness right after any potentially disruptive interventions. Therefore, the emphasis on performing a hydrostatic test under these circumstances is imperative for maintaining optimal safety standards and preventing failures in service.

In contrast, the other options suggest regular time intervals which may not directly address situations when immediate testing is critical, thereby not aligning with safety best practices that prioritize immediate verification post-repair or cleaning.