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Who reviews plans for “T-Boats”?

Ref: 46 CFR177.202
Under 65” the OCMI or MSC, over 65” MSC reviews the plans


2. What are the proper dimensions for draft markings and how are the read?

Ref: 46 CFR 185.602
8 inches by 1 inch with the upper edge of the mark being the max draft.


3. When are “T-Boats” required to have a load line?

Ref: 46 CFR 175.122
A vessel 79 ft and over on international voyages


4. What vessels are required to have maximum allowable draft marks?

Ref: 46 CFR 185.602
Vessels greater than 65 feet, vessel on international routes with more than 12 pax, and vessels with more than one deck.


5. Where does damage and wastage occur normally in an aluminum vessel? Steel utility?

Ref: Aluminum Hull NVIC 11-80 and Steel Hull NVIC 7-86
Look for hull damage caused by groundings, collisions, allisions or possibly vessel’s employment. I.e. backing down to a platform to offload cargo or persons would cause damage and wastage to the vessel’s stern/transom. Another location for damage is the bow where excessive pounding from rough waters can cause severe damage to the internal structures. At sharp edges. Sharpe edges where aluminum plates are welded together tend to fracture due to locked in stress.


6. When may repairs be made to a “T-Boat” that do not require a marine inspection?

Whenever a vessel is hauled out or placed in a dry-dock or slipway in excess of the requirements of this subpart for the purpose of maintenance, including, but not limited to, changing a propeller, painting, or cleaning the hull, no report need be made to the cognizant OCMI.