Orifice Plate Type & Their Usage in API & Chemical Industries

Definition Of Orifice Plates
Cross Section of Orifice Assembly
Orifice Plate Material of Construction
Types of Orifice Plates

1. By API Pharmaprenuer Tech Subscribe Watch Full Video Orifice Plate Type & Their Usage

2. Definition Of Orifice Plates : Orifice plates are one of the most popular devices for the measurement and control of fluid flow. The shape and manufacturing tolerances of plates used in measurement applications are defined in the international standardization publications of ISO, AGA, ASME and others. Plate bore size are determined based on the relationships and values of flow, & differential pressure. In flow control applications, orifice plates are used as restriction devices to regulate fluid flow or reduce the flowing pressure downstream of the orifice plate. Orifice Plates are normally mounted between a set of Orifice Flanges and are installed in a straight run of smooth pipe to avoid disturbance of flow patterns from fittings and Valves .

3. Cross Section of Orifice Assembly : 1. Orifice Plate 2. Hole In Plate 3. Tappings 4.   Orifice flange

4. Orifice Plate Material of Construction: Standard material grades for orifice plates include: 316 Stainless Steel, 304 Stainless Steel, 310 Stainless Steel, Hastelloy Duplex Stainless Steel, Super Duplex Stainless Steel, Monel 400, Carbon Steel, Titanium

5. Types of Orifice Plates: SQUARE EDGE (STANDARD) BORE QUADRANT EDGE BORE ECCENTRIC BORE SEGMENTAL BORE Ring Type Joint 4 . 3 . 2 . 1. 5.

6. Types of Orifice Plates: SQUARE EDGE (STANDARD) BORE: The most common orifice plate (Also Known as concentric bored). It’s used on most processes including clean liquids, gases and steam flow. It is usually made of stainless steel. Other materials like nickel and Monel are used for a good corrosive resistant property. This type of orifice plate has a very high accuracy.

7. Types of Orifice Plates: 2. QUADRANT EDGE BORE The quadrant edge bore is an orifice with the inlet edge rounded. The upstream side of the bore is shaped like a flow nozzle while the downstream side acts as a sharp edge orifice plate. This design is recommended to measure the flow of high viscosity fluids such as heavy crudes, syrups and slurries. The quadrant bore produces a relatively constant coefficient when the Reynolds Number is below 10,000.

8. Types of Orifice Plates: 3. ECCENTRIC BORE Eccentric bore orifice plates are plates with the orifice off- center , or eccentric, as opposed to concentric. Location of the bore prevents accumulation of solid materials or foreign particles and makes it useful for measuring fluids containing suspended solid particles. Eccentric bore orifice plates are more uncertain as compared to the concentric orifice .

9. Types of Orifice Plates: 4. SEGMENTAL BORE The segmental bored orifice plates contain a hole that is a segment of a concentric circle like the eccentric orifice plate design. The segmental hole should be offset downward in gas flow applications. Segmental bores are generally used for measuring liquids or gases which carry non-abrasive impurities such as sewage treatment, steel, chemical, water conditioning, paper and petrochemical industries.

10. Types of Orifice Plates: 5. Ring Type Joint (RTJ) Orifice Plate: The RTJ type orifice plate incorporates an essential gasket for mounting between ring type joint flanges. It is based on proven technology, has no moving parts and is suitable for high temperature and pressure applications. Orifice plates are recommended for clean liquids, gases and low velocity steam flows. Plate thicknesses depend on line size and differential pressure, and should be sufficient to prevent the plate from bending under operating conditions.

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