USCG Exam Practice · Vessel stability — metacentric height, free surface
When performing stability calculations under 46 CFR §28.540, how must the free surface effect of tanks fitted with cross-connection piping be calculated?
- AAs separate individual tanks, each calculated independently
- BUsing only the inertia method; the moment of transference method is not permitted
- CAs one common tank, unless valves kept closed to prevent liquid transfer are installed✓ correct
- DAs half the combined free surface effect of both tanks
Why C is correct
46 CFR §28.540(b) requires that tanks fitted with cross-connection piping be calculated as one common tank unless valves that will be kept closed to prevent the transfer of liquids as the vessel heels are installed in the piping.
Cited:46 CFR §28.540
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