In ships equipped with demineralizers, what is the name for the water entering the demineralizer from any tank?

The term for the water entering the demineralizer from any tank is referred to as "Raw Feedwater." This is the unprocessed water that is sourced from various tanks and is intended for treatment in the demineralization system.

The demineralizer's role is to remove impurities and minerals from the raw feedwater in order to produce high-quality distilled or demineralized water suitable for use in steam generation and other processes aboard the ship. This initial stage is crucial because any contaminants can affect boiler efficiency and may lead to scaling or corrosion.

"Reserve Feedwater," on the other hand, typically indicates water that is stored for potential future use but is not the correct term for what goes directly into the demineralizer. Other terms such as "Cold Feedwater" and "Service Water" refer to water classifications used in different contexts aboard ships, further confirming that "Raw Feedwater" is the appropriate identification for the water entering the demineralizer.