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CHEMCO Exit Exam • Set 7 Question 13 of 30

The air valve on the boiler top shall be kept

✓

Direct Answer

Option A: Open for a while during raising steam from cold

Opening the air vent during steam raising allows trapped air and non-condensable gases to escape. This prevents excessive pressure build-up and ensures proper circulation as steam forms, a critical step for safe start-up outlined in boiler operating manuals.

All Options

A
Open for a while during raising steam from cold (Correct Answer)
B
Closed while shut down of boiler for maintenance
C
Forced draft fan speed

Detailed Explanation & Context

Opening the air vent during steam raising allows trapped air and non-condensable gases to escape. This prevents excessive pressure build-up and ensures proper circulation as steam forms, a critical step for safe start-up outlined in boiler operating manuals.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).

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