Water Tight Integrity

Question 1

When may the collision bulkhead be omitted on a “T-Boat”?

Answer 1

Ref: 46 CFR 179.210
When the vessel is less than 65 feet or carries less than 49 pax, does not operate in exposed water, more than 40 feet and does not operate in partially protected waters, not a double ended ferry or made of wood and does not operate in cold waters.

Question 2

When are watertight doors in subdivision bulkheads required to be closed?

Answer 2

Ref: 46 CFR 179.330

At all times except when a person is passing through the door.

Question 3

When can a weather deck hatch be only weather-tight?

Answer 3

Ref: 46 CFR 179.360
the following hatches may be weather tight:
(1) A hatch on a watertight trunk that extends at least 305 millimeters (12 inches) above the weather deck;
(2) A hatch in a cabin top; and
(3) A hatch on a vessel that operates only on protected waters.

Question 4

Where are Class 1 watertight doors allowed on a “T-Boat”?

Answer 4

Ref: 46 CFR 170.255(a) and (c)
Except as provided in paragraphs (b) and (c) of this section, Class 1 doors within passenger, crew, and working spaces are permitted only above a deck, the molded line of which, at its lowest point at side, is at least 7 feet (2.14 meters) above the deepest load line. (c) states; Class 1 doors are permitted in any location on a vessel that—
Is less than 100 gross tons; and will operate only in the offshore oil industry trade.

Question 5

How do you determine which doors must be marked “keep closed while underway”?

Answer 5

Ref: 46 CFR 185.610

All watertight doors and hatches must be marked.

Question 6

What are the limiting factors to an inspector when determining the seaworthiness of a vessel? (WI)

Answer 6

Ref: 46 CFR 176.500
During inspection or re-inspection Nothing in this subpart limits the marine inspector from conducting such tests or inspections he or she deems necessary to be assured of the vessel’s seaworthiness.