Question 39General Subjects - 1st Asst/Chief70% to pass
The vacuum maintained in the salt water feed heater shell of a flash-type evaporator is generally accomplished by _______________.
AI Explanation
The correct answer is C) by an external line from the first stage via a fixed orifice.
In a flash-type evaporator, the vacuum in the salt water feed heater shell is generally maintained by an external line that connects the first stage of the evaporator to the feed heater shell. This external line includes a fixed orifice, which helps create the necessary vacuum in the feed heater shell by drawing vapor from the first stage.
The other options are incorrect because: A) the fixed orifice is typically used to control the steam supply, not create the vacuum; B) there is no direct unimpeded connection between the second stage and the feed heater; and D) a separate air ejector unit is not the primary means of creating the vacuum in the feed heater shell.
Related Questions
#37 Which of the following conditions occurs in the section labeled "F" of the device shown in the illustration? Illustration MO-0110 #38 Feed water supplied to a flash type distilling plant will flash to vapor in the first-stage due to _______________.#40 Small droplets of water entrained in the flashed vapor produced in a flash-type evaporator are removed by the _______________.#41 Regarding the low pressure evaporator steam control orifice in the live steam supply line, the steam at the outlet of the orifice if not properly conditioned will be developed as _______________.#42 Under normal operating conditions, the highest temperature and pressure conditions existing for flash-type evaporators will occur in the _______________.