Question 373Steam Plants - Assistant Engineer70% to pass
Ferrous sulfate tends to go into solution in boiler water when the value of the hydrogen ion concentration increases. Consequently, the water in a 900 psi boiler should be _______________.
AI Explanation
The correct answer is D) pure and treated to a pH value of 10.5 to 11.0.
Ferrous sulfate is more soluble in boiler water when the pH value is high, typically between 10.5 and 11.0. This is because the higher pH value, which indicates a more alkaline environment, helps keep the ferrous sulfate in solution. Maintaining the boiler water at this pH range helps prevent the precipitation of ferrous sulfate, which can lead to scaling and corrosion issues in the boiler system.
The other answer choices are incorrect because: A) a pure boiler water with a zero pH value would be highly acidic, which is not desirable; B) a pH of 4.0 to 4.5 would be too low and promote the precipitation of ferrous sulfate; and C) a neutral pH of 7.0 would not be optimal for keeping ferrous sulfate in solution.
Related Questions
#371 Although accurate tests of boiler water for dissolved oxygen are difficult to obtain onboard ship, you can be fairly certain of proper oxygen removal by _______________.#372 In the prevention of moisture carryover from a marine boiler, one important consideration is to _______________.#374 Which of the listed operating practices is considered as safe, and should be followed when opening and inspecting the waterside of a boiler? #375 Which of the precautions listed should be taken when gagging a boiler safety valve? #376 If it should become necessary to abandon a compartment because of the danger of a large steam leak on a boiler, which of the following actions represents the best avenue of escape?