You are on an inerted tankship. A low pressure alarm must be set to cause an audible and visual alarm if the pressure in the tanks cannot be maintained at more than __________.
Official USCG Answer & Rule Citation
Correct Answer: Option A — 4" water gauge
Under USCG and SOLAS inert gas regulations, a low-pressure alarm must sound if the pressure in the cargo tanks falls below 4 inches (100 mm) water gauge. This ensures a positive pressure is maintained, preventing air ingress and explosive atmosphere formation.
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