What is the result of having trapped air in steam mains?

Trapped air in steam mains can impede the flow of steam, leading to inefficiencies. When air becomes trapped, it can create pockets that essentially act as barriers to steam movement, which can result in decreased heat transfer efficiency. This trapped air reduces the capacity of the steam system to deliver the necessary heat and can lead to uneven heating in the system, causing some zones to overheat while others remain cold.

Furthermore, the presence of air can lead to water hammer, which is a destructive phenomenon that occurs when steam rapidly condenses and creates pressure waves. This can result in damage to pipes and fittings over time. Additionally, trapped air can contribute to the formation of condensate, which can accumulate and cause blockages in the system.

Thus, the result of having trapped air in steam mains is a reduction in efficiency and the potential for blockage, affecting the overall operation of the steam system.