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D.C Heaters Study Guide questions with correct answers
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D.C Heaters Study Guide questions withcorrect answers
The minimum design height of the DC heater is determined by the _____ - ANSWER -minimum
net positive suction head required by the main feedpump
The purpose of the steam control valves installed in the auxiliary exhaust line is to ______. -
ANSWER -control steam admission and maintain the proper steam spray pattern in the DC
heater
In order to test the lifting pressure of the deaerating feed heater relief valve, you would ______.
- ANSWER -Close the auxiliary exhaust dump valve to the main and auxiliary condensers.
Increase the set point of the make up steam regulator to the auxiliary exhaust system.
Why is it necessary to have a relief valve protect the deaerating feed tank from internal
pressure? - ANSWER -Because the tank receives high pressure drains
Which of the DC heater operations listed will result in excessive dissolved oxygen in boiler
water? - ANSWER -Excessivly high water level in the heter.
Adding excessive make up feed.
Operating the heater with a closed air vent.
During normal operation, the steam flow from the auxiliary exhaust line to the DC heater can be
closely related to the ______. - ANSWER -the temeprature and quantity of the condensate flow
to the DC heater
Rapidly discharging condensate into the DC heater during normal steaming conditions could
cause ____. - ANSWER -a decrease in auxiliary exhaust pressure
Which conditions would cause a high level in the deaerating feedwater tank? - ANSWER -
Temporary operating both boilers at below normal water levels.
D.C Heaters Study Guide questions with
correct answers
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