Question 231Steam Plants - 1st Asst/Chief70% to pass
If a boiler generates saturated steam at 125.3 psig, how much heat is required to change the water into steam if the feed water temperature is 240°F? Illustration SG-0004
AI Explanation
The correct answer is D) 983.4 Btu/lb.
The amount of heat required to change water into saturated steam at a given pressure is known as the latent heat of vaporization. At a pressure of 125.3 psig, the latent heat of vaporization for water is 983.4 Btu/lb. This value can be found in steam tables or other reference materials commonly used for marine engineering calculations.
The other options are incorrect because they do not represent the correct latent heat of vaporization for the given pressure. Option A (30.5 Btu/lb) is too low, Option B (116.5 Btu/lb) is also too low, and Option C (582.7 Btu/lb) is significantly lower than the actual value.
Related Questions
#229 What physical changes will occur to the steam within a boiler that has been properly bottled up when additional heat is applied? #230 Which of the following statements is true concerning the information tabulated in the table? Illustration SG-0004 #232 The water level in a steaming boiler has risen to within 2 inches from the top of the gage glass. Your immediate action should be to _______________.#233 Excess free oxygen in the boiler feed water can be the result of _______________.#234 In a closed feed and water cycle, which of the conditions listed could prevent vacuum from reaching the desired level?