California Designated Operator Practice Exam

What test must be performed on new primary piping operating under pressure after installation?

1. Pneumatic test

2. Leak detection test

3. Tightness test

4. Visual inspection

The correct answer is: Tightness test

The correct answer is the tightness test, which is specifically designed to ensure that newly installed primary piping can operate safely under pressure without any leaks. This test is crucial because it verifies that all joints, connections, and the integrity of the piping system itself are sound and capable of containing the intended fluid or gas without leakage. A tightness test typically involves pressurizing the piping system with a gas or liquid and monitoring it for a specified period. If the pressure remains stable and does not drop below a predetermined threshold, it indicates that the system is sealed properly. This is an important safety measure to prevent hazardous leaks that could potentially lead to accidents or environmental harm. While other tests, such as pneumatic tests and leak detection tests, may also be considered in different contexts, they do not specifically focus on assessing the overall tightness of the system after installation. Visual inspections are essential in identifying visible issues but do not provide the definitive assurance needed for a system that operates under pressure. Therefore, the tightness test is essential and aligns with safety regulations for newly installed primary piping.