Final answer:
Corrosion, fatigue, and insufficient design are the primary causes of CNG cylinder failure.
Step-by-step explanation:
In the context of CNG (compressed natural gas) cylinders, the primary causes of failure can be attributed to factors such as corrosion, fatigue, and insufficient design.
Corrosion can occur when the cylinder is exposed to moisture and chemicals, leading to the deterioration of the material. This can weaken the cylinder and potentially cause it to fail.
Fatigue is a result of repeated cyclic loading and unloading of the cylinder. Over time, this can cause cracks to develop and propagate, eventually leading to failure.
Insufficient design refers to situations where the cylinder is not adequately designed to handle the stresses and pressures associated with CNG storage. This can result in structural weaknesses and eventual failure.