PSSR Exit Exam • Set 6 Question 4 of 30
What precaution must be taken before opening steam lines or boiler blowdown valves?
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Direct Answer
Option A: Drain condensate thoroughly to prevent water hammer
Trapped condensate in steam lines causes destructive water hammer when high-pressure steam pushes liquid slugs against bends and closed valves.
All Options
A
Drain condensate thoroughly to prevent water hammer
(Correct Answer)
B
Open main valve rapidly at full speed
C
Fill line with cold sea water first
D
Insulate valves with wet cotton waste
Detailed Explanation & Context
Trapped condensate in steam lines causes destructive water hammer when high-pressure steam pushes liquid slugs against bends and closed valves.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Personal Safety & Social Responsibilities (PSSR).
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