ASU Term_C

Electrical conductors of copper, aluminium, etc

Determination of the accuracy of an instrument by finding its variation from some standard measurement.

Example: Calibration of Pressure, Flow & Temperature Transmitters etc.

A large deep ditch filled with water.

a) Relating to a tank: Maximum volume

b) Relating to a specific equipment, a unit or to a plant: Maximum production or output

Example: a) Capacity of LOX/LIN storage Tanks.

b) Capacity of DGAN Compressor

It refers to a control system involving two or more controllers. One instrument measures a process variable (as temperature or pressure) and resets a second process condition (as flow) through another controller.

Any substance which affects the rate of a chemical reaction and which, in general, remains unchanged at the end of the reaction.

System by which D.C. charge of 24 volt is induced across underground pipes to stop/slowdown corrosion.

Sodium Hydroxide or caustic soda, mostly used to neutralize acids. Caustic has a sharp pungent odour, is a heavy musky liquid and is extremely hazardous to the skin and eyes.

Example: 50% caustic solution is used in Precooling water system

to improve the PH value.

If a centrifugal pump suction head is low, suction is plugged, then cavitation may occur, which is the formation and collapse of vapor bubbles in the liquid. A crackling sound is produced by cavitation due to violent collapse of vapor bubbles. It causes pitting and erosion of the impeller.

A compressor that uses centrifugal force to impart pressure and velocity to a gas is a Centrifugal Compressor. High velocity gas from the impeller passes through the diffuser, which is of larger radius where its velocity decreases and pressure increases.