# ABOVE-WATER HULL

 The hull section of a vessel above the waterline, the visible part of a ship.

## Related Terms

### DRAFT

The depth of the ship below the waterline measured vertically to the lowest part of the hull

### TRIMARAN

A triple hulled vessel

### WATERLINE

The line where the hull of a ship meets the water's surface.

### LEAKAGE

Escape of liquids such as water, oil, etc., out of pipes, boilers, tanks, etc., or a minor inflow of seawater into the vessel due to a damage to the hull

### PARALLEL MID-BODY LENGTH

Also known as PBL, PMBL, or Mid-Body Length-This describes the middle side area of a tanker's or other vessel's exterior hull which is flat and usually vertical. This is usually the area of the hull that is in contact with the pier when a vessel is docked. This area is measured from aft of the bow where the hull reaches maximum beam and then proceeds aft with little variance until the hull recesses again towards the centerline near the stern. This area is the same on both sides of a vessel and therefore runs in parallel down the middle of the ship. The length of the mid-body is important to know when voyage planning to determine if a vessel will safely be able to moor at a particular facility

### DOCKING PLAN

A detailed plan and profile of the lower hull structure required to correctly position a vessel in a slipping operation.

### SHALLOW WATER EFFECT

The effect that due to the depth of water, the speed of the vessel and shape of the vessels hull causes the vessel to sink deeper in the water especially in shallow water and at high speed.

### PMBL

Parallel Mid-Body Length - describes the middle side area of a tanker's or other vessel's exterior hull which is flat and usually vertical. This is usually the area of the hull that is in contact with the pier when a vessel is docked. This area is measured from aft of the bow where the hull reaches maximum beam and then proceeds aft with little variance until the hull recesses again towards the centerline near the stern. This area is the same on both sides of a vessel and therefore runs in parallel down the middle of the ship. The length of the mid-body is important to know when voyage planning to determine if a vessel will safely be able to moor at a particular facility

### CROSSOVER

The system of valves and cargo lines in the bottom piping network of a tank vessel that connects one section of cargo tanks to another section.

### LENGTH BPP

The length of a vessel along the waterline from the forward surface of the stem, or main bow perpendicular member, to the after surface of the sternpost, or main stern perpendicular member. Believed to give a reasonable idea of the vessel's carrying capacity, as it excludes the small, often unusable volume contained in her overhanging ends.

### Related questions

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