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Drilling operation to form a flaring depression around the rim of a hole.



Related Terms

FEED OFF

To lower the bit continuously or intermittently during a drilling operation by disengaging the drum brake.

BOILER SAFETY CONTROL

Automatic controls and interlocks (including relays, switches, and other auxiliary equipment used in conjunction to form a safety control system) which are intended to prevent unsafe operation of the controlled equipment.

COMPLEMENTARY SYMMETRY

A circuit using both pnp and npn transistors in a symmetrical arrangement that permits push-pull operation without an input transformer or other form of phase inverter.

ENGINE CYLINDER

A cylindrical chamber in an engine in which the energy of the working fluid, in the form of pressure and heat, is converted to mechanical force by performing work on the piston. Also known as cylinder.

DIAGONALS

Fairing lines added to a vessel's body plan. They take the form of straight lines (usually three in smaller craft) drawn diagonally from the centreline, to strike the area of the waterline. The projection a line drawn from the series of intersection points found (of diagonal & waterline) along the hull, gives an indication of the likely water flow across the structure.

ACID GAS

Any gas that contains a significant amount of constituents that may form acids when mixed with water. An example is the acid gas, consisting largely of hydrogen sulphide and carbon dioxide, created in the process of sweetening natural gas.

CRITICAL SLOPE

The maximum angle with the horizontal at which a sloped bank of soil of a given height will remain undeformed without some form of support.

RADIATION FOG

A major type of fog, produced over land when radiational cooling reduces the temperature to or below its dew point. Radiation fog is a nighttime occurrence although it may begin to form by evening twilight and often does not dissipate until aft sunrise.

WAVE OF TRANSLATION

A wave in which the individual particles of the medium are shifted in the direction of wave travel, as ocean waves in shoal waters; in contrast with an OSCILLATORY WAVE, in which only the form advances, the individual particles moving in closed orbits, as ocean waves in deep water.

ASSMANN PSYCHROMETER

A special form of the aspiration psychrometer in which the thermometric elements are well shielded from radiation.

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