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SHIPLANDS.COM (Marine Glossary, Marine Abbreviations, Maritime Dictionary, Nautical, Oceanography, Shipping Terms, Trade and Shipping Terms)
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Marine Abbreviations
PRATIQUE License or permission to use a port
Premium The cost of insurance, which is usually computed at certain percentage of the shipowners declared valuation
PREP National Preparedness for Response Exercise Program
Pres Presumed
Prev Previous
Primer First coating of paint applied to steel plate to prevent corrosion
Prismatic Coefficient The ratio of a ships displaced volume of water to the volume of a prism having a length equal to the length of the ship and a cross-sectional area equal to the ships maximum midship sectional area CP = immersed volume.                   
Product Tanker A type of tanker designed to carry refined oil products such as gasoline for motorcars, gas oil or diesel oil for industry, naphtha for petrochemical industry, aviation fuel, kerosene, etc.; this kind of tanker usually has large number of cargo tanks capable of handling several different grades of oil at the same time; also known as product carrier
Proof Load The load applied to an item under controlled testing; varies from 10% to 100% in excess of the items normal load
Propeller A hub with three or more blades projected from it and secured to the aft end of the propeller shaft by key; when the shaft is rotated by engine, the blades cut the water developing a thrust that propels the ship it is designated right-handed when the propeller turns clockwise when viewed from aft, and left-handed when turning anti-clockwise the tip of the blade is the point furthest from the hub while the root is connected to the hub face of the blade is the after surface and the working surface of the blades, opposite is the back of the bldae leading edge is the edge of the blade that cuts the water first when moving ahead; opposite is the following edge
Propeller Pitch Distance advanced by one complete rotation of the propeller if there is no slip
Protecting Agent Agent appointed by shipowners to protect their ships interests at times when the charterers use their own agents in ports; also known as protective agent
Prow Old name for stem or bows
PRT Port
PSC Port state control
PSI Pounds Per Square Inch
PSIX Port State Information Exchange (USCG)
PSV Plattform Supply Vessel
PT Product tanker
Pte Ltd (Limited Liability Company) Commonly used by private companies in Singapore where limited exempt companies also use this style.
PTON Per ton
Pty Ltd (Proprietary Limited Company) A private company in Australia, South Africa and elsewhere.
PU PUmps
Pulpit Guard rail round the bow of a yacht
Purifier A rotating machinery for separating two liquids of different specific gravity or solids from liquid by the use of centrifugal force; the mixture is rotated at several thousand revolutions per minute within a bowl and the heavier the fluids or solids the further away from the centre of rotation achieving separation; usually used to purify fuel oil or lubricating oil for diesel engine use
Purser Officer on a ship who is in charge of accounts and stores, especially on a passenger ship.
Push knee Structure mounted on the hull of a tug for pushing barges; it is designed to minimise contact damage to both vessels
Push Tug A tug designed for pushing dumb barge instead of towing; advanced design may employ special mechanical locking arrangement at the bow to engage the barge quickly and efficiently
PWH Per Workable Hatch
PWWD Per Weather Working day