The water level in the drum during the normal operating mode.


Related Terms

TRY VALVES

Test valves on a water column used to verify the water level when the gauge glass is out of service.

POINT OF FALL

The point in the curved path of a falling projectile that is level with the muzzle of the gun. Also known as level point.

PHOTOELECTRIC LIQUID-LEVEL INDICATOR

A level indicator in which rising liquid interrupts the light beam of a photoelectric control system; used in a tank or process vessel.

PERMISSIBLE EXPOSURE LIMIT

The level of air contaminants that represents an acceptable exposure level as specified in standards set by a national government agency; generally expressed as 8-hour time-weighted average concentrations. Abbreviated PEL.

OVERSTRESSING

Cyclically stressing a material at a level higher than that used at the end of a fatigue test.

OVERLOAD CAPACITY

Current, voltage, or power level beyond which permanent damage occurs.

ORTHOMETRIC HEIGHT

The distance above sea level measured along a plumb line.

ORTHOMETRIC CORRECTION

A systematic correction that must be applied to a measured difference in elevation since level surfaces at varying elevations are not absolutely parallel.

ORDER POINT

The inventory level at which a replenishment order must be placed.

OPERATING WATER LEVEL

The water level in a boiler drum which is normally maintained above the lowest safe level.

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