Which term describes the excessive concentration of particles in the boiler water?

The term that describes the excessive concentration of particles in the boiler water is foaming. Foaming occurs when the surface tension of the water is affected, often due to the presence of impurities or dissolved solids. In a boiler, this condition can lead to the formation of foam on the water surface, which can inhibit proper steam production and result in the carryover of water into the steam system.

Foaming can impact efficiency and safety in boiler operations because the foam may prevent the boiler from effectively separating steam from water, which can cause water to be carried into the steam lines. This is particularly critical since water carryover can lead to equipment damage and reduced thermal efficiency.

Other terms in the choices refer to different phenomena not specifically related to the excessive concentration of particles in the boiler water. For example, priming refers to the unwanted surfacing of water in the steam, but it doesn't specifically indicate the concentration of particles. Similarly, condensate carryover relates to the steam systems and the return of water, while pressurized water is a general term that does not describe a condition related to particle concentration in the boiler.