In metal tubing installation, what is considered undesirable?

• A. Over-tightening of connections
• B. Slack in the installation
• C. Tension
• D. Inconsistent pipe sizes

Answer: (C)

In metal tubing installation, tension applied to the tubing is considered undesirable because it can lead to several serious issues. When metal tubing is under tension, it may become susceptible to stress fractures, deformation, or even failure during operation. Unlike flexible materials, metal has a limited ability to withstand tension without compromising its structural integrity. Ensuring that the tubing is not placed under tension is crucial for maintaining the system's overall reliability and safety.

Additionally, while options like over-tightening of connections, slack in the installation, and inconsistent pipe sizes also present challenges, they generally result in immediate mechanical issues or inefficiencies rather than the long-term risk management problems associated with tension. Over-tightening can lead to leaks or damage at connections, slack can affect flow efficiency, and inconsistent pipe sizes can create flow restrictions or turbulence. However, tension fundamentally alters how the tubing interacts with the overall system, making it particularly critical to avoid.