Class 2 (2nd Engineer) MEKG 📅 Feb 2024

Exam Question

With reference to feed regulation:

(a) Describe, with the aid of sketches, the operation of a boiler feed water regulator controlled by atleast 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 led in the level transmitter starts to leak (4)

Reference Answer

### (a) Three-Element Boiler Feed Water Regulator Operation
A three-element boiler feed water regulator provides precise control over the drum water level by measuring and comparing three process variables: (1) Drum Water Level, (2) Steam Flow Rate, and (3) Feed Water Flow Rate. This system is essential for high-pressure, high-evaporation rate boilers that are subject to rapid and large load changes.
**Components:**
1. **Drum Level Transmitter (LT):** A differential pressure (DP) transmitter that measures the hydrostatic head difference between a constant reference leg and a variable leg connected to the boiler drum. This provides the primary measured variable.

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