Q2. With regards to boiler water level control. Explain the following (16)
A. Shrink and swell phenomenon.
B. Cascade control.
C. Split control.
D. Condensing chamber – Function and location.
Q8. With reference to feed regulation:
a) Describe, with the aid of sketches, the operation of a boiler feed water regulator controlled by at least two other parameters besides water level in the drum. (8)
b) Give reasons for the inclusion of the other elements besides water level in controlling feed flow. (4)
c) Deduce the possible effects on the system when the drain valve in the constant leg in the level transmitter starts to leak. (4)
Q1. (a) With respect to auxiliary boiler water level maintenance and indication, describe, with the aid of sketch’s, the sensing devices for. (i)A feed pump control; (ii) Local water level; (iii) Remote water level; (iv) Low and high water level alarms.
Q8. Describe how the following conditions can be avoided in auxiliary boilers - A. Furnace distortion; B. Uptake fires; C. Difficulty in maintaining normal water level.
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