Question 138Steam Plants - Assistant Engineer70% to pass
Which of the listed conditions will always result in dissolved oxygen being carried over from the main condenser?
AI Explanation
The correct answer is C) Taking on makeup feed.
When the vessel takes on makeup feed, it introduces additional dissolved oxygen into the boiler feedwater system. This dissolved oxygen is then carried over to the main condenser, where it can contribute to corrosion and scale formation in the condenser tubes.
The other options are not directly related to the introduction of dissolved oxygen into the condenser. Priming in the boiler, dumping auxiliary exhaust steam, and excessive DC heater temperature do not necessarily result in dissolved oxygen being carried over to the main condenser.
Related Questions
#136 If a salinity alarm system indicates 2.5 grains per gallon at the main condensate pump discharge, your first action should be to _______________.#137 What type of sensor is normally used with the automatic recirculating valve in the main condensate line? #139 The atmospheric drain tank (ADT) normally drains to the _______________.#140 Cooling water to the vent condenser in a DC heater is supplied by the _______________.#141 Which of the components listed prevents water from flowing back into the auxiliary exhaust line if the deaerating feed tank becomes flooded?