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Types of clouds the mean level of which is between the surface and 6,500 feet. The principal clouds in this group are stratocumulus, stratus, and nimbostratus.

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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