FREE DISCHARGE ORIFICE
If there is no liquid on the down steam side of a orifice and the orifice will discharge freely to atmosphere without the obstruction caused by liquid on the down stream side is known as free orifice and it's discharge is called free discharge.
FULLY SUBMERGED ORIFICE
If the liquid level on down stream side is above the top edge of the orifice is fully submerged orifice.
If there is no liquid on the down steam side of a orifice and the orifice will discharge freely to atmosphere without the obstruction caused by liquid on the down stream side is known as free orifice and it's discharge is called free discharge.
FULLY SUBMERGED ORIFICE
If the liquid level on down stream side is above the top edge of the orifice is fully submerged orifice.
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