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What are the Different Types of Orifice Plates?
The different types of orifice plates are:
* Concentric
* Segmental
* Eccentric
* Quadrant Edge
Concentric:
The Concentric Orifice Plate is used for ideal liquid as well as gases and steam service. This orifice plate beta ratio fall between of 0.15 to 0.75 for liquids and 0.20 to 0.70 for gases and steam. Best results occur between value of 0.4 and 0.6. Beta ratio means ratio of the orifice bore to the internal pipe diameters. (45 degrees beveled edges are often used to minimize friction resistance to flowing fluid.)
Eccentric:
The Eccentric Orifice Plate has a hole eccentric. Use full of measuring liquids containing solids, oil containing water and wet steam. Eccentric plates can be used either flange or vena contracta taps, but the taps must be at 180 degrees or 90 degrees to the eccentric opening.
Eccentric orifices have the bore offset from the center to minimize problems in services of solids-containing materials.
Segmental:
The Segmental Orifice Plates has the hole in the form of a segment of circle. This is used for colloidal or slurry flow measurement. For best accuracy, the tap location should 180 degrees from the center of the tangency.
Segment orifices provide another version of plates useful for solids-containing materials.
Quadrant Edge:
It is commonly used in Europe and are particularly useful for pipe sizes less than two (2) inches.
Quadrant edges orifices produce a relatively constant coefficient of discharge for services with low Reynolds numbers in the range of 100,000 down to 5,000.