What is swelling & shrinking in Boiler drum level control?

[@birukkifle4990]

Thanks! simple explanation.

[@learninstrumentationengine268]

👍🏻

[@joshuadoyle2319]

Hi. What are some of the common causes of shrinkage and swelling? How would blackouts relate to the phenomenon, if at all.
Researching for a project.

[@learninstrumentationengine268]

Pl check out playlist for detailed videos available on boiler drum swelling and shrinking. Thanks