Deck General · Trim (TPI, MT1)
A vessel has a TPI of 50. If 200 tons of cargo are loaded on the centerline, the mean draft change is:
- A0.25 inches
- B4 inches✓ Correct
- C10,000 inches
- D0.04 inches
Explanation
Draft change = tons / TPI = 200 / 50 = 4 inches. The vessel sinks 4 inches deeper on the mean draft. If the load is on the centerline (LCF), draft changes equally fore and aft with no trim change.
Authority: Stability & Trim (USCG deck topic)
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