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A large conduit to receive and confine fluids forced by pressure from process vessels.



Related Terms

RIDGING

The pressure process by which sea ice is forced into ridges.

FORGE WELDING

A welding process which produces the joining of metals by heating them in a forge and by applying pressure or blows.

ABSORPTION CYCLE

In refrigeration, the process whereby a circulating refrigerant, for example, ammonia, is evaporated by heat from an aqueous solution at elevated pressure and subsequently reabsorbed at low pressure, displacing the need for a compressor.

CLADDING

Process of covering one material with another and bonding them together under high pressure and temperature. Also known as bonding.

FLEMING CRACKING PROCESS

An obsolete liquid-phase thermal cracking process for heavy petroleum fractions; the charge was heated under pressure in a vertical shell still.

COLLAPSE PROPERTIES

Strength and dimensional attributes of piping, tubing, or process vessels, related to the ability to resist collapse from exterior pressure or internal vacuum.

PNEUMATIC TEST

Pressure testing of a process vessel by the use of air pressure.

HUMMOCKING

The pressure process by which sea ice is forced into hummocks. When the floes rotate in the process, it is called SCREWING.

VOLUME FLOW RATE

The volume of fluid flowing through the cross- section of a conduit in unit time at the pressure and temperature prevailing in that section.

SUBMERGED ARC WELDING

An arc welding process that produces coalescence of metals by heating them with a bare metal electrode. the arc is maintained with a blanket of granulated flux. A consumable filler wire is employed and the arc is maintained between this wire and the parent plate. Around the arc the granulated flux breaks down and provides some gases and a highly protective thermally insulating molten container for the arc. This allows a high concentration of heat, making the process very efficient and suitable for heavy deposits at fast speeds. After welding the molten metal is protected by a layer of fused flux which together with the unfused flux may be recovered before cooling.

The process is basically only intended for down hand applications and where it is used for single pass welding of any size it is essential to use some form of the backing bar because of the comparatively large weld pool obtained. Here the backing bar may be of copper and waste cooled or a flux trough may be provided to form the underbead.

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