jacket

jacket

Engineering

1. any exterior covering or casing, such as the insulating cover of a boiler

2. the part of the cylinder block of an internal-combustion engine that encloses the coolant

Jacket

 

a covering, usually removable, of a book or booklet in the form of a sheet with flaps. It is generally made of heavy paper coated for purposes of reinforcement or covered with a transparent synthetic film that also improves the jacket’s appearance. Jackets are sometimes made from polymer films. Originally, jackets were used to protect the bindings of expensive editions from damage; they were later used for purposes of publicity as well. The jacket sometimes serves a purely aesthetic purpose.

jacket

[′jak·ət]

(mechanical engineering)

The space around an engine cylinder through which a cooling liquid circulates.

(nucleonics)

A thin container for one or more fuel slugs, used to prevent the fuel from escaping into the coolant of a reactor. Also known as can; cartridge.

(ordnance)

Cylinder of steel covering and strengthening the breech end of a gun or howitzer tube.

The water jacket on some machine guns.

(petroleum engineering)

The support structure of a steel offshore production platform; it is fixed to the seabed by piling, and the superstructure is mounted on it.

jacket

jacket, 1

1. A metal or cloth covering over the heat insulation which is applied to exposed heating pipes and ducts.

2. An outer casing around a pipe or vessel, the space between being filled with a fluid for cooling, heating, or maintaining a fixed temperature.

jacket

A metal shroud used to insulate a portion of the hot section of a gas turbine engine. A jacket prevents heat damage to the aircraft structure.

jacket

A plastic housing that contains a floppy disk. The 5.25" disk is built into a flexible jacket; the 3.5" disk uses a rigid jacket.