Visual Testing (VT) Practice Exam

What type of connection is commonly associated with piping leaks?

1. Integral attachments

2. Bolted connections

3. Screwed joints

4. Welded connections

The correct answer is: Bolted connections

The choice of bolted connections is particularly relevant when discussing piping leaks because these connections rely on physical fasteners to hold two or more components together. Over time, factors such as vibration, thermal expansion, and thermal cycling can cause the bolts to loosen. If this happens, it can lead to gaps forming between the connected parts, creating pathways for fluids or gases to escape, and resulting in leaks. In addition, the presence of gaskets in bolted connections can degrade or wear out, which further contributes to the potential for leaks. The need for regular maintenance and inspection is often emphasized for bolted connections specifically to address and mitigate these vulnerabilities. In contrast, other connection types may have different structural characteristics. Integral attachments are often more secure but can be harder to inspect. Screwed joints may also experience issues related to loosening, but they typically involve smaller diameters which might limit the impact of leaks compared to larger bolted connections. Welded connections, while generally more robust and less prone to loosening or mechanical failure, can develop leaks as a result of thermal stress, corrosive environments, or improper welding techniques, but are not as frequently associated with leaks in a general context.