Ship Terminology - Page 4

tigertc · 05-05-2006

Do you have to learn all this stuff off by heart Bunk?
ooo arrrr me hartys! jim lad etc etc etc.

**Bunkerbarge** · 05-05-2006

You be carefull young lad or you'll be gettin' a Joggle Plate up your Transom!!!

rjwood_uk · 05-05-2006

ar gag ga ga ga....now wheres me put me spinach

adzam · 05-05-2006

excellent stuff richard.
i think it deserves a section all onits own

**Bunkerbarge** · 05-05-2006

Thanks for the support gents, enthusiasm has varied somewhat during this project but I think I have broken it's back and I can see the light at the end of the tunnel.

I will be a bit more carefull about what I taken on next time though!!

**Bunkerbarge** · 05-05-2006

M

Maierform: A very distinctive bow shape with a pronounced rake.
Main Deck: The uppermost continuous deck from which all Freeboard calculations are determined.
Main Hatch: The largest and, usually, most centrally positioned hatch reserved for heaviest cargoes.
Margin Line: This is a line drawn 76mm below the upper surface of the bulkhead deck at the ships side. A passenger ship is sub divided into watertight compartments, which are designed in such a way as to not allow this line to become submerged should any two compartments become flooded.
Margin Plate: Is any plating that constitutes the outer boundaries of the double bottom spaces.
Marlin Spike: Not a ship construction term but simply a point of interest. A marlin spike is a pointed piece of metal with a screwdriver like head used for splicing steel wires. A common way of making them would be to turn down a large diameter stud bar and wrap copper wire into the thread to form a handle. If you made one of these for an AB you might get a nice carving or a decorative knot in return.
Mast: Traditionally used for attaching derricks for cargo operations or carrying a sail. Nowadays used simply to attach navigation lights and radar scanners.
Mast Step: The strengthened part of a vessels structure, possibly even in the keel where a mast would be secured.
Mast Table: A small platform attached to the mast used to support the end of the derrick.
Messenger: 1)Is a continuous rope passing from a capstan to a cable and is used to haul it on board. 2) Any form of small wire or rope attached to a much larger wire or rope to enable the larger to be hauled between the vessel and ashore for purposes of mooring the vessel.
Metacentre: The metacentre is a measurement of the vessels stability at small angles of heel. It is taken as an indication of the vessels behavior when underway such that a high metacentre would indicate the vessel would return to upright quickly and the vessel is considered as sensitive or tender.
Metacentric Height: Refer to the GM entry and the above.
Midship Area: Is the immersed area of the midship section.
Midship Section: A transverse section of the vessel taken at the midships point in the hull. It is usually the largest area of section.
Monkey Island: Is the area above the bridge where, traditionally, the vessel could be conned from if visibility was poor. All bridge equipment was usually repeated here. The name has stuck however and now refers to any deck on top of the bridge. A favourite sunbathing area on cargo ships, sometimes reserved for the Captains wife, who would usually not realize that she could be overlooked from the top of the funnel.
Moor: To tie up and secure a vessel by rope to either a quayside or a buoy.
Mooring Ring: A cast and usually oval ring set along a bulwark through which mooring lines could be led to keep them out of the way.
Mooring Winch: A winch gear driven by steam or electrically with a warping end on one of the horizontal shafts for the handling or mooring ropes.
Moulded Breadth: The largest possible breadth of the vessel taken at the midships section taken internally.
Moulded Depth: The vertical distance once again, at the midship section, from the top of the keep to the inside of the upper deck plating.
Mousing: A few additional turns taken around a cargo hook to prevent the rope eye jumping out of the hook.
Muff Coupling: Is a form of coupling between two ends of a shaft. It does not use flanges or bolts but is simply two tapered sleeves forced together hydraulically. This force causes the internal diameter to reduce and thus grips the two ends of the shafts. Used regularly in prop shafts the entire propeller load is transmitted through nothing more than frictional force between two metallic surfaces. It always impresses the hell out of me anyway!!

tigertc · 06-05-2006

n o p q r s t u v.....w x y z...should b finished just in time for Leave.!!!!!!!

**Bunkerbarge** · 11-05-2006

N

Net Registered Tonnage: Is a derivative of the gross tonnage arrived at by deducting spaces used for the accommodation of crew, navigation and propulsion machinery.
Norman Pins: Rollers that can be erected at a tugs aft bulwarks to guide the tow hawser over the aft of the vessel and prevent the tow passing over the vessels beam.

**Bunkerbarge** · 11-05-2006

O

Oakum: A joint material made from tarred rope fibres used for caulking decks and sealing structures.
Observation Tank: A tank that collects condensate returns from a steam system and incorporates a weir that allows the collection of any oil contamination that may be returned from fuel tanks.
Oertz Rudder: Is a specific type of high lift or flap rudder.
Open Shelter Decker: A shelter deck vessel whereby the tonnage opening is maintained permanently open. It is specifically designed so that the registered tonnage does not include the shelter deck space even though this space could be used for the carriage of cargo.
Orlop: Not commonly used nowadays but was traditionally the lowest deck in a vessel.
Outboard: Is in a direction away from the centerline of the vessel and opposite to Inboard.
Outreach: The maximum extent cargo handling equipment can reach.
Outrigger: Is a mast extension, which effectively increases the spread of the stays to the topmast.
Overage: Is a term used to express the amount of cargo discharged in excess of the quantity declared in the manifest.
Overall Length: Is the maximum length of the vessel including all protrusions.
Oxter Plate: Is a stiffening steel plate that fits around the upper part of the rudder post.

**Bunkerbarge** · 11-05-2006

P

Panama Chocks: Are a type of casting with an oval opening fitted at either end of a vessel used for passing the mooring lines to the Mules when going through the Panama Canal.
Panamax: A classification of vessel of any type that is the maximum size due to its breadth that can transit the Panama Canal.
Panting: is the inwards and outwards movement of hull plating. Experienced more at the bow area as a result of wave action.
Panting Beams: Additional stiffening beams in the forward and aft sections of the hull designed to resist panting.
Paravane: Is a device incorporating a steel cable used to sever floating magnetic mine wires, allowing them to float to the surface where they could be disposed of.
Parbuckle: Is the action of rolling a round object up a ramp using a rope passed around it. The rope is looped around and the free ends are hauled on causing the object to roll upwards. The term is also used when righting a vessel or boat that may be aground. When bringing it upright.
Parbuckling: Is used mainly as a term when righting a vessel, which may be aground, and needs to be upright when a tide returns. Either external forces can be used such as the ropes described above, or internal such as movement or cargo or ballast.
Pendant: Is a short length of steel wire attached to the end of a towrope to prevent chaffing of the heavily used part of the rope.
Period of Roll: The time taken for one complete rolling cycle of the vessel measured from usually full over to port or starboard.
Permissible Length: The length between bulkheads in a vessel calculated to ensure that the vessel will remain afloat if one or more compartments should become flooded. Permissible length is a quoted fraction of the floodable length and often referred to as a factor of subdivision.
Perpendiculars: The forward perpendicular is a vertical line through the intersection of the loaded waterline and the stem frame and the aft perpendicular is a vertical line through where the aft side of the sternpost meets the loaded waterline or, if there is no post, through the center of the rudderstock.
Pig’s Ear: Is basically a funnel or tundish, which usually has an open-ended pipe running into it so that the quality of the fluid flowing can be monitored.
Pilgrim Nut: Is a patented design of a propeller securing nut. It incorporates an internal annular ring that is hydraulically operated to force the propeller up the tapered end of the shaft and therefore does away with the need of a stress inducing keyway.
Pilgrim Wire: A wire fixed at one end and passing over a pulley at the other with a weight on it. The tensioned wire is then used as a reference point for checking the alignment of such things as propeller shafts. The catenary or sag of the wire can be calculated using the modulous of elasticity and the weight and this can be incorporated into the calculations.
Pillars: Vertical internal structural supports between decks and the lower hull.
Pintles: Are the bearing hinges on which a rudder hangs.
Pitching: A rotational movement about a transverse axis of the ship as it progresses through a seaway.
Plane Sailing: An expression derived from the simplification of a navigational exercise by considering the surface to be flat rather than flowing the earth’s curvature.
Plimsol Line: See Load Line. The expression came from the name Samual Plimsol who devised the system of limiting loads after large numbers of vessels were lost at sea due to overloading.
Plummer Block: A bearing support block used mainly in propulsion shafting.
Pontoon Hatch Cover: Is a hatch cover consisting of a single removable solid piece. This type of hatch cover is found on container ships where the hatch is removed with the container crane locating in dogs set into the cover.
Poop: Is the area of superstructure on the aft upper deck.
Port: Is the left hand side of the vessel looking forward designated by a red navigation light. It could also refer to an opening in the ships side for the passage of goods or personnel.
Porthole: Circular ships window which, if fitted below the uppermost continuous deck, will incorporate a deadlight to close over it in the event of heavy weather.
Pounding: the action of the vessel when it falls onto a wave after being lifted by a previous one. This action leads to panting and can also be referred to as slamming.
Prismatic Coefficient: Is a ratio of the volume of water displaced by a ship to the volume as represented by the length of the vessel multiplied by the area of the submerged midship section.
Projected Area: The area of the blades of a propeller as projected onto a flat surface.