Washington DC 3rd Class Boiler Practice Test

A flow control should be blown down when?

At the start of shift Once per shift Only during maintenance After a fault occurs

Correct Answer:

Once per shift

Explanation:

Blow down of a flow control is used to purge the line and remove any buildup, air, or contaminants so the control device reads and operates accurately. Doing this on a regular, routine basis keeps the flow measurement and valve behavior stable, preventing drift or sticking that can occur from deposits over time. The best practice is to perform a short blowdown once per shift, which establishes a clean, known starting condition without interrupting operations more than necessary. Doing it only during maintenance would miss the regular cleaning that keeps the system consistent during normal operation, and blowing down after a fault is more about addressing a problem reactively rather than maintaining accurate control.

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