Rocks & mirror
WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

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Polytunnel

energy

A polytunnel is a tunnel typically made from steel and covered in polyethylene, usually semi-circular, square or elongated in shape. The interior heats up because incoming solar radiation from the sun warms plants, soil, and other things inside the building faster than heat can escape the structure.

Polyurethane

marine

A resin with special characteristics. Paints based on polyurethanes are either one or two-pack, and they wear extremely slowly and are resistant to chemicals.

Polyurethane foam

marine

A foam obtained from the reaction between the polyetherpolyol and the polyisocyanate.

PONA number

energy

The PONA number is an index for oil components.

Pondage

energy

Pondage refers to the comparably small water storage behind the weir of a run-of-the-river hydroelectric power plant.

Pontoon

marine

A simple, non self-propelled and unmanned floating structure without hatchways in the deck except small manholes closed with gasketed covers.

Pontoon cover

marine

A cover with both sides closed. This term is often misused as the alternative name for an open-girder lift-away cover.

Poop

marine

A superstructure which extends from the aft perpendicular forward to a point, which is aft of the forward perpendicular. The poop may originate from a point aft off the after perpendicular, (ICLL).

Porosity

energy

Porosity or void fraction is a measure of the void spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0% and 100%.

Port

marine

A harbour in which ships can load or discharge cargo.

Port facility

marine

A location where the ship/port interface takes place, including anchorages, berths, and approaches.

Port Facility Security Officer (PFSO)

marine

Person designated as responsible for the development, implementation, revision, and maintenance of the port facility security plan and for liason with the port authorities and Ship Security Officers and Company Security Officer.

Port of Registry, hailing port

marine

The place where a ship is registered. It is shown on the stern of the vessel.

Port side

marine

The left-hand side of a ship when looking forward. Opposite to starboard.

Portable decompression chamber

marine

A unit intended for human occupancy under greater than atmospheric pressure conditions. It is installed on a vehicle such as a helicopter or truck.

Porthole, port light, sidescuttle

marine

A circular opening in the ship side to provide light and ventilation. A hinged metal cover or deadlight can be clamped over to secure in heavy weather.

Poseidon Principles

marine

A global baseline to support societal goals and environmental responsibility consistent with the International Maritime Organization “IMO” ambitions for Green House Gas “GHG” reductions.

Position Mooring System

marine

A system which keeps the Floating Installation Vessel on station. There are two types of position mooring systems: conventional spread mooring and single point mooring.

Positive displacement pumps

energy

A positive-displacement pump makes a fluid move by trapping a fixed amount and forcing (displacing) that trapped volume into the discharge pipe.

Possible reserves

energy

Possible reserves are reserves which analysis of geological and engineering data suggests are less likely to be recoverable than probable reserves.

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