3rd Class Stationary Steam Engineer License Practice Test 2026 - Free Practice Questions and Study Guide

The correct answer is that a feed water pump will become steam bound if the water temperature in the open feedwater heater is too high. When the temperature of the feed water exceeds the saturation temperature corresponding to the pressure in the feedwater heater, the water can vaporize into steam. This steam can accumulate and create a condition known as "steam binding," which occurs when steam fills the pump casing and prevents water from being effectively pumped.

This situation is problematic because a steam-bound pump loses its ability to effectively move water, leading to operational issues and potentially damaging the pump itself. It is crucial to maintain the feedwater temperature at an appropriate level to ensure that it remains in a liquid state, which allows for smooth functioning of the pump and efficient boiler operation.