Question 141General Subjects - Assistant Engineer70% to pass
Which of the following statements concerning the arrangements of a potable water system is true?
AI Explanation
The correct answer is A.
Potable water pumps of the non-positive displacement type, such as centrifugal pumps, require a vacuum-priming system if located above the potable water storage tanks. This is because non-positive displacement pumps cannot create enough suction to lift water from below the pump level, so a vacuum-priming system is necessary to ensure the pump can be filled and primed.
In contrast, positive displacement pumps like gear pumps can create enough suction to lift water from below the pump level, so they do not require a vacuum-priming system in that scenario (option B is incorrect). Similarly, non-positive displacement pumps located below the water storage tanks do not need a vacuum-priming system (option C is incorrect), as gravity can provide the necessary pressure for the pump to operate.
Related Questions
#139 What type of disinfection system has the disadvantage that it would fail to provide residual disinfectant in the potable water? #140 Which of the following desalination plants will always require a sterilizer when providing water to a potable water system? #142 On most commercial cargo vessels with a relatively small crew size and few users of the potable water system, how is the potable water system pressure maintained? #143 What is the primary purpose of the lead-lag arrangement of the two potable water pumps supporting a typical potable water system? #144 What design feature is used to minimize potable water wastage associated with hot water distribution piping for a potable water system?