Rocks & mirror
WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

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423 results

Propeller pitch

marine

The distance that a propeller theoretically (i.e. without slip) advances during one revolution.

Propeller rake

marine

It is the distance at the blade tip between the generating line and the line perpendicular to the propeller axis that meets the generating line at the propeller axis.

Propeller shaft coupling flange

marine

For connecting the propeller shaft with the intermediate shaft, a hydraulic coupling flange is used.

Propeller shaft, tail shaft

marine

The aftermost section of the propulsion shafting in the stern tube in single screw ships and in the struts of multiple screw ships to which the propeller is fitted.

Propeller skew angle

marine

Skew angle of a propeller is the angle measured from ray “A” passing through the tip of the blade at mid-chord line to ray “B” tangent to the mid-chord line on the projected blade outline.

Propeller surface finish

marine

A propeller surface finish has big effect on fuel consumption. A surface finish of 70 microRa will add over 4.5 per cent to the fuel consumption bill compared with one of 10 microRa.

Propeller, screw propeller

marine

A revolving screw-like device that drives the ship. The screwtype propeller consists of a hub and blades, all spaced at equal angles about the axis. When the blades are integral with the hub, the propeller is known as a solid propeller.

Propulsion Condition Monitoring Service

marine

In August 2010, Wärtsilä introduced its Propulsion Condition Monitoring Service (PCMS) for all types of propulsion machinery. This service aims to provide the customer with information about the condition of his propulsion equipment.

Propulsion shafting

marine

A system of revolving rods that transmit power and motion from the main drive to the propeller. The shafting is supported by an appropriate number of bearings.

Propulsion system, propulsion plant

marine

A system which provides thrust to propel the ship. It consists of propulsion machinery and the auxiliary systems needed to operate them...

Propulsors

marine

Various devices used to propel ships: paddle wheels, screw propellers, thrusters, waterjets. For ocean-going ships various types of screw propellers have almost exclusive application.

Prospective short-circuit current

energy

The prospective short-circuit current (PSCC), available fault current, or short-circuit making current is the highest electric current which can exist in a particular electrical system under short-circuit conditions.

Protected extra-low voltage

energy

IEC 61140 defines a PELV system as "an electrical system in which the voltage cannot exceed ELV under normal conditions, and under single-fault conditions, except earth faults in other circuits".

Protection and Indemnity Clubs (P&I Clubs)

marine

The Clubs are associations of shipowners and charterers, owned and controlled by the insured shipowner or charterer “Members”.

Protectionism

marine

Flag state protection of own shipping by the elimination of certain competive elements.

Protective relay

energy

In electrical engineering, a protective relay is a relay device designed to trip a circuit breaker when a fault is detected.

Proven reserves

energy

Proved reserves are the highest valued category.

Provision stores

marine

Refrigerated stores intended to preserve perishable foods for shipboard use.

PS10 Solar Power Plant

energy

The first commercial concentrating solar power tower located in Spain producing 11 megawatts of electricity with 624 heliostats.

Psychrometrics

energy

Psychrometrics, psychrometry, and hygrometry are names for the field of engineering concerned with the physical and thermodynamic properties of gas-vapor mixtures.

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