Steel soundproof airtight door is used for engine control room, made according to the standard of CB3217-1984. There are two types: one is without window, the other is with double window.
1)Length between perpendiculars (Lpp)
Distance between the fore and the aft perpendicular.
2)Length over all (Loa)
The horizontal distance from stem to stern.
3)Length on the water line (Lwl)
Horizontal distance between the moulded sides of stem and stern when the ship is on her summer mark.
The greatest moulded breadth, measured from side to side outside the frames, but inside the shell plating.
5)Breadth over all
The maximum breadth of the ship as measured from the outer hull on starboard to the outer hull on port side.
6)Draught at the stem (Tfwd)
Vertical distance between the water line and the underside of the keel, as measured on the force perpendicular.
7)Draught at the stern (Ta)
The vertical distance between the water line and the underside of the keel as measured from the aft perpendicular.
The difference between the draught at the stem and the draught at the stern.
Down and trimmed by the head. If the draft is larger at the stem, than at the stern.
Down and trimmed by the stern. If the draft is large at the stern, than at the stem.
On an even keel, in proper trim. The draft of the stern equals the draft of the stem.
The vertical distance between the base line and the upper continuous deck. The depth is measured at half Lpp at the side of the ship.
The distance between the waterline and the top of the deck at the side (at the deck line). The term summer freeboard means the distance from the top of the S-line of the Plimsoll’s mark and the topside of the deck line.
The vertical distance between the water line and the highest point of the ship. The air draught is measured from the summer mark. If the ship has less draught on can ballast until it reaches the summer draught and so obtain its minumum air draught.
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