What can occur if a horizontal cylinder is not stored in its proper position?

When a horizontal cylinder, such as those used to store propane, is not stored in the proper position, one of the significant risks is that liquid propane can enter the vapor system. Propane exists in both liquid and vapor states, and the phase that is utilized in applications such as fueling is the vapor.

If the cylinder is stored horizontally, it can lead to the liquid propane pooling in the valve area. This can create situations where liquid propane is forced into the gas lines and equipment intended for vapor. The consequence is not only operational inefficiency but also safety hazards, as equipment is typically not designed to handle liquid propane, which can lead to dangerous situations such as system failures or the risk of a leak.

In contrast, the other scenarios listed, such as increased pressure, reduced gas flow efficiency, and corrosion, may be related issues, but the immediate and critical concern with improper horizontal storage is the introduction of liquid propane into vapor systems, leading to potential safety hazards. Properly positioning the cylinder ensures that propane remains in the correct phase for safe and effective usage.