____ gauges can be used in ships only if the tank is above the deck.
Direct Answer
Option A: Differential pressure
Differential pressure gauges are suitable for tanks above deck because they measure liquid height by sensing the pressure difference between the tank bottom and the atmosphere. This setup simplifies the measurement as the reference pressure is readily available at the tank's base, unlike tanks below deck where a more complex reference system would be required.
All Options
Detailed Explanation & Context
Differential pressure gauges are suitable for tanks above deck because they measure liquid height by sensing the pressure difference between the tank bottom and the atmosphere. This setup simplifies the measurement as the reference pressure is readily available at the tank's base, unlike tanks below deck where a more complex reference system would be required.
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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