Deadweight tonnage

this is the actual number of tons of

cargo, bunkers, stores, etc, that can be

put on board a ship to bring her down to

her "marks"

Decantation

separation of a solid from a liquid, or a

liquid from a solid, by sucking, pumping

or pouring the liquid away without disturbing

the solid or liquid which has settled

below

Decompression chamber

a special chamber in which a diver gradually

returns to normal conditions after

working at high pressure underwater

Delocalized electrons

electrons that are not associated with a

particular atom or bond in a molecule, as

in aromatic compounds such as bezene

Demurrage

the sum agreed by charter to be paid as

damage for delay beyond the stipulated

time for loading or discharging

Draw-down

the differences between the static and the

flowing bottom-hole pressures in a well

Derv, derv fuel

an acronym for diesel engine road vehicle

fuel, a medium-light liquid fuel

derived from gas oil

Detergent

a cleansing liquid or solid

Dialkene

an aliphatic compound containing two

double carbon-to-carbon bonds in

its molecules

Oritice

a device to restrict partially the flow

through a pipe, the difference in pressure

on the two sides of the orifice plate can

be used to measure the flow rate through

the pipe

Dividend

the profit from a company paid to

its investors

Motorman

the man responsible for the care and

operation of the drilling engines

Diesel fuel

the light oil fuel that is used in diesel and

other compression-ignition engines

Dynamic positioning

the method whereby a vessel is kept on

station by computer-controlled thruster

propellers rather than by anchors

Diolelin

see dialkene

Dispersanl

a chemical used to reduce the surface

tension between two liquids, e g to break

up an oil slick

Distillation

the process by which liquids are separated

or purified by successive vaporization

and condensation

Distillates

the products obtained by condensation

during the fractional distillation process,

i e the gaseous fuels, kerosene and

gas oils

Additive

a term used generally to indicate special

chemicals which may be added to products

to improve their characteristics

Secondary recovery

recovery of oil or gas from a reservoir by

artificially maintaining or enhancing the

reservoir pressure by injecting gas,

water or other substances into the

reservoir rock

Дата добавления: 2015-11-14