If a boiler carries a large slug of water over into the steam, this condition is termed what?

The correct term for the condition when a boiler carries a large slug of water into the steam is referred to as priming. Priming occurs when the steam generated in the boiler is contaminated by water droplets being entrained in the steam flow. This can happen if the water level in the boiler is too high or if there are sudden changes in steam demand.

Priming is significant because it can lead to water hammer in pipelines, which can cause damage to the system. Additionally, carrying water into the steam can reduce the efficiency of steam utilization and may damage equipment downstream. Recognizing and addressing priming is essential for maintaining boiler efficiency and safety.

The other terms provided relate to different conditions in boiler operation. While flooding refers to an excessive water level in the boiler that prevents the proper generation of steam, surging indicates a rapid fluctuation in water levels. Boiling simply refers to the process of water turning into steam, which does not inherently indicate any issues with water being carried over into steam.