What is meant by priming in the context of steam heating?

Priming in the context of steam heating refers to the carryover of water and condensate into the steam header. This phenomenon occurs when steam bubbles form in the boiler water and, due to the rapid movement of steam, they can cause small droplets of water to be entrained along with the steam as it exits the boiler. This carryover can lead to issues like reduced efficiency, water hammer, and potential damage to equipment downstream in the piping system where the steam is utilized.

Understanding this concept is crucial for steamfitters as it affects the performance and safety of steam heating systems. Proper boiler management practices and the use of appropriate separators or steam traps can help minimize priming, ensuring a higher quality of steam and efficient operation of the heating system.