Rocks & mirror
WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

P

423 results

Profile

marine

A side elevation of a ship form.

Programmable load

energy

A programmable load is a type of test equipment or instrument which emulates DC or AC resistance loads normally required to perform functional tests of batteries, power supplies or solar cells.

Programmable logic controller

energy

A programmable logic controller (PLC) is an industrial digital computer that has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, robotic devices, or any activity that requires high reliability, ease of programming, and process fault diagnosis.

Progressing cavity pump

energy

Widely used for pumping difficult materials, such as sewage sludge contaminated with large particles, this pump consists of a helical rotor, about ten times as long as its width.

Progressive collapse

marine

The gradual collapse of the hull girder, involving the spread of elasto-plastic buckling throughout a transverse section, following which the vessel is no longer capable of sustaining any longitudinal bending loads.

Project

energy

A project is a temporary endeavor designed to produce a unique product, service, or result with a defined beginning and end undertaken to meet unique goals and objectives, typically to bring about beneficial change or added value.

Project cycle management

energy

Project cycle management is the process of planning, organizing, coordinating, and controlling a project effectively and efficiently throughout its phases, from planning through execution then completion and review to achieve pre-defined objectives or satisfying the project stakeholder by producing the right deliverable at the right time, cost and quality

Project Management

energy

A company, team or individual that manages a complete project on behalf of a client.

Projected area of a propeller

marine

This is the sum of the area bounded by the outline of the blades when projected onto a plane perpendicular to the axis of the screw.

Prompt and thorough repair

marine

Permanent repair completed at the time of the survey to the satisfaction of the surveyor, therein removing the need for imposition of any associated condition of class.

Prompt criticality

energy

In nuclear engineering, prompt criticality describes a nuclear fission event in which criticality is achieved with prompt neutrons alone and does not rely on delayed neutrons.

Prompt neutrons

energy

Neutrons born within 10−14 seconds of the fission are termed "prompt neutrons".

PROPAC (propulsion package)

marine

An integrated mechanical propulsion system developed by Wärtsilä as a single supplier with commitment to lifetime support.

Propane

energy

Propane is a three-carbon alkane with the molecular formula C3H8.

Propeller boss cap fins (PBCF)

marine

see POWER-SAVING DEVICES.

Propeller clearances

marine

The distance from the propeller to the hull has a linear influence on the pressure impulses. A reduction of this clearance by 50% doubles the pressure impulses. To account for the ice class it is necessary to increase the thickness of blade sections.

Propeller diameter

marine

The largest possible propeller diameter is preferred in order to obtain the highest possible propulsive efficiency.

Propeller excitation forces

marine

The propeller is a potential source of noise and vibrations in a ship. The vibration of a propeller are strongly related to the variation in inflow velocity (wake-field), the clearance from propeller tip to hull surface and blade geometry.

Propeller hub (of CP propeller)

marine

The hub is bolted to the flanged end of the tailshaft. Without ice class, the hub diameter/propeller diameter ratio varies between 0.20 and 0.25.

Propeller nozzle

marine

A circular casing enclosing the propeller. The propeller operates with a small gap between blade tips and the nozzle internal wall, roughly at the narrowest point. The nozzle ring has a cross-section shaped like a hydrofoil.

Download the Encyclopedia