What can cause a "fitting failure" in fluid systems?

Fitting failure in fluid systems can indeed be attributed to factors such as over-tightening, under-tightening, or corrosion. These issues directly impact the integrity and functionality of the fittings that hold the fluid lines together. Over-tightening can lead to damage or deformation of the fitting or the connected tubing, creating leaks or weaknesses. Under-tightening may result in insufficient seal, allowing fluid to escape under pressure. Corrosion can weaken materials over time, leading to failure due to material breakdown or loss of strength.

While high pressure, poor material selection, and temperature fluctuations can all have detrimental effects on fluid systems, they are not the primary causes of fitting failure in the way that mechanical issues like improper fastening techniques or material degradation due to corrosion are. These latter factors are more closely connected to the direct operational and maintenance practices in managing fittings and connections within the system. Thus, option B encompasses critical considerations that must be managed to ensure the longevity and reliability of fittings in fluid systems.