What are the two most common causes of pressure control failures?

The two most common causes of pressure control failures are related to moisture from steam and the lack of a siphon tube. When steam systems operate, they generate moisture, which can affect the pressure control mechanisms. If excess moisture reaches the pressure controls, it can lead to incorrect pressure readings, causing the controls to either over or underreact, resulting in pressure fluctuations and potential system failures.

The absence of a siphon tube can exacerbate this issue. A siphon tube is designed to create a water barrier between the steam and the pressure control device, protecting the control mechanism from direct exposure to steam. Without this protective barrier, moisture can directly enter the control, compromising its ability to accurately gauge pressure levels. Therefore, proper system design requires incorporating a siphon tube to ensure reliable operation of the pressure controls, helping prevent failures.

Understanding these causes is crucial for maintaining the integrity of steam systems and ensuring they operate reliably and safely.