WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

L

227 results

Local fire protection

marine

Passenger vessels over 500GT and cargo ships over 2000GT with the keel laid after July 2002 will have to be fitted with local fire protection in machinery spaces in addition to the CO2 system.

Location

marine

The finding of ships, aircrafts or persons in distress.

Lock

marine

A region of a canal or river which can be enclosed by gates. It is then filled or emptied in order to raise or lower ships whilst afloat.

Lockout–Tagout

energy

Lock Out, Tag Out (LOTO) is a safety procedure used in industry and research settings to ensure that dangerous machines are properly shut off and not able to be started up again prior to the completion of maintenance or repair work.

Lofting

marine

The process of developing the size and shape of the components of the ship hull structure from the designed lines.

Log

marine

A device, which measures the distance travelled and the speed of a ship moving through the water.

Log book

marine

A record book that the master of a ship is required to fill in during a voyage. Originally it was a book for recording readings from the log.

Logarithmic mean temperature difference

energy

The logarithmic mean temperature difference (also known as log mean temperature difference, LMTD) is used to determine the temperature driving force for heat transfer in flow systems, most notably in heat exchangers.

Logistics

energy

How goods, services or people are moved to provide a service to customers.

Longitudinal wave

energy

Longitudinal waves are waves in which the displacement of the medium is in the same (or opposite) direction of the wave propagation

Longitudinals

marine

Fore-and-aft structural shape or plate members attached to the underside of decks, flats, or to the inner bottom, or to the inboard side of the shell plating, in association with widely-spaced transverses, in the longitudinal framing system.

Longliner

marine

A fishing vessel that employs a long main line supported by floats with shorter lines attached to it with baited hooks at their lower point. Shooting of the long line is done over the stern.

Long-lived fission products

energy

Long-lived fission products (LLFPs) are radioactive materials with a long half-life (more than 200,000 years) produced by nuclear fission of uranium and plutonium.

Lookout

marine

1. Activity carried out by sight and hearing as well as by all available means appropriate for the prevailing circumstances and conditions to make a full appraisal of situation and the risk of collision.

Losses

energy

In an electrical or electronic circuit or power system part of the energy in play is dissipated by unwanted effects, including energy lost by unwanted heating of resistive components, the effect of parasitic elements (resistance, capacitance, and inductance), skin effect, losses in the windings and cores of transformers due to resistive heating and magnetic losses caused by eddy currents, hysteresis, unwanted radiation, dielectric loss, corona discharge, and other effects.

Loss-of-coolant accident

energy

A loss-of-coolant accident (LOCA) is a mode of failure for a nuclear reactor; if not managed effectively, the results of a LOCA could result in reactor core damage.

Lost circulation

energy

Loss s of circulation is the uncontrolled flow of hole mud into a formation, sometimes referred to as a “thief zone.”

Lot 20

energy

Lot 20 is an EU legislation that was designed to remove inefficient heating technologies from the market and reduce the energy used by products that heat our homes.

Louver

marine

An opening to the weather in a ventilation system, fitted with a series of overlapping vanes at about 45 degrees to the vertical intended to minimize the admission of rain or seawater spray to the opening.

Low flame-spread

marine

Low flame-spread means that the surface thus described will adequately restrict the spread of flame, this being determined in accordance with the Fire Test Procedures Code.

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