What happens to equipment when a steam trap is stuck closed?

When a steam trap is stuck closed, the primary consequence is that steam cannot escape, leading to an accumulation of condensate in the equipment or piping. This buildup of condensate can create pressure issues and result in water hammer, which may damage the equipment over time. The trapped condensate can also cause overheating and corrosion, further compromising the integrity of the system.

While the other options consider potential impacts, they do not accurately reflect the primary issue caused by a closed steam trap. For instance, equipment cannot achieve improved efficiency when it is hindered by excess condensate. Similarly, steam would not fill condensate lines effectively because the steam is being trapped, and condensate does not return to the boiler in this scenario—this would typically happen if the trap were functioning correctly. Therefore, understanding the implications of a steam trap being stuck closed highlights the importance of maintaining these components to ensure proper system operation and avoid damaging conditions.