CPD Programme
Module 16
May 2010
_________________________________________
1. If water at 20°C and 1 bar gauge is heated to 60°C, what is the potential amount of released air into a system?
A 10 L/m3
B 15 L/m3 C 20 L/m3
D 25 L/m3 E 30 L/m3
2. In the article what was the main reason given for typically installing AAVs at the top of risers?
A To trap microbubbles when the system was operating B To ensure that they did not get blocked with magnetite C To provide an area of still water to allow air to rise D To capture air that naturally gravitates to high points E To reduce pitting corrosion on the valve
3. Temperature differential separators principally operate at which of these conditions?
A By providing a ‘still’ water environment at a point in the system with a higher temperature
B By providing a high system temperature and high pressure
C By allowing the temperature of the water to drop in the large vessel
D By setting up a temperature difference between the top and bottom of the large vessel
E By removing the air when the whole system cools down
4. Pressure differential separators operate by which of these methods?
A Being installed at a low pressure point in the system
B By repeatedly deaerating small samples of water by reducing the pressure
C By connecting across two points in the system to benefit from the pressure difference
D By providing a ‘still’ water environment at a point in the system with a higher pressure
E By removing air bubbles through manual operation of a vacuum pump
5. Which of these is unlikely to be true for a properly-installed dirt separator?
A They normally need operating maintenance of a few minutes each year
B They remove magnetic dirt only C They remove particles heavier than water D They operate by providing a ‘still’ water environment E They can be combined into a single unit with a deaerator
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CIBSE Journal May 2010
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