ORIFICE PLATE- FOR YOUR FLOW MEASUREMENT PROBLEMS
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| Information |
| Orifice Plate |
Orifice Plate is the heart of the Orifice Meter. It restricts the flow and develops the Differential Pressure which is proportional to the square of the flow rate. The flow measuring accuracy entirely depends upon the quality of Orifice plate, its installation and maintains.
When measuring wet gas or saturated steam a weep hole is drilled in a concentrically bored orifice plate. This is a small hole drilled on the orifice plate such that its location is exactly on ID of the main pipe.
The Orifice plates are manufactured as per ISA / AGA/ API / ANSI standards and in various materials such as SS304
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/SS316 /SS316L /Hestoly C / Monel / PTFE coated.
Various bores are used for various applications.
Orifice Plate is categories in two types :- Paddle Type & Universal Palate
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| Paddle Type Orifice Plate |
| This plate is sandwiched between two Orifice Flanges. Tag Plate of orifice plate projects out from Orifice flanges and it indicates the existence of Orifice plate. Details such as Tag NO /Orifice ID / Pipe ID / Plate Material are stamped on one side of the tag plate which faces upstream side of the pipe line. Outside diameter of the orifice plate equals to PCD-1 Bolt Dia. This ensures the concentricity with the main pipe line. The other method to maintain the concentricity is by using sleeves on the bolts or by providing dowel pins on the Orifice Flanges. |
| Universal Orifice Plate |
| This is a circular plate designed to fit in the Orifice fittings / Plate holders / carrier rings / Ring Type Joints(RTJ). |
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| Features |
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| Despite various advances in flow measurement, Orifice Assembly remains one of the most used flow element. |
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This is because of - |
Accuracy within +/- 1% |
Robust & Simple Design |
Proven Design |
Zero Maintenance |
First Principle Device - Which never Fails |
Suitable for All Pipe Sizes from 1/2’’ to 36’’ |
Suitable for Almost All Types of Fluids |
Proven Solution for Flow Measurement |
Very nominal cost compared to other flow elements |
Because of proven data available, no need of frequent calibration like other element |
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Size
for Integral Design : 15, 20, 25, 40 mm |
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Size
for Flanged Design : 25, 40, 50, 65, 80, 100, 150 ...250 mm |
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Material-
Flanges & Carrier Ring : A105 / SS304/ SS316 / SS316L / CS & Other materials
on request. |
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Orifice
Plate : SS304, SS316, SS316L, Hast C, Monel, PP, PVC,PTFE,
Coated or Clad with PP / HDPE / PTFE. |
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Gasket
: CAF / SS Spiral Wound + CAF / PTFE / PVC / Rubber,
Other materials as per special request. |
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Stud
/ Nut : ASTM A193 Gr B/ASTM A194 CI 2H A193 B16/A194 C14 |
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Standards
Applicable : Design - ISA RP 3.2 / DN 1952 / BS 1042
- 1981-84 |
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Bore
Calculation : ISO 5167 / BS 1042 / RW Miller / L. K.
SPIN / AGE - 3.7 |
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Flanges
: ANSI B-16-36 / or Equivalent |
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Types
: Square edge concentric, Quadrant edges, Conical entrance,
Eccentric. |
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Pressure
Toppings : For 1" to 16" - Flange Taps / Corner
Taps. Above 16" - D x D/2 |
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| Different Types of Orifice Plates and their applications |
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| A |
Paddle Type Orifice Plate |
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| 1) |
Cocentric Beveled Bore |
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Application :
This most common bore used in the industries. This is the only type generally accepted for use in custody transfer measurement, since adequate data is not available for other bores. Used primarily for clean homogeneous liquids, gases, non viscous fluids. The bevel is matched at 45° angle to the desired throat thickness. |
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2) Restriction Bore |
Application :
This type is not used for flow measurement but for dropping the pressure considerably and reducing the flow accordingly. The bore is not beveled but kept straight. The beta ratio has no limit as accuracy is not the goal |
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Eccentric Bore |
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Application :
Used for measurement of flow for fluids containing solids and slurries. It is also used for vapors and gases where condensation is present. The eccentric bore is offset to where the bore edge is inscribed in a circle that is 98% the line id. |
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4) Segmenta Bore |
Application :
The segmental bore is located in the same way that the eccentric bore is. This type is used primarily for slurries or extreamly dirty gases wher the flow may contain impurities heavier than the fluid. |
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Quadrant Bore |
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Application :
Used for high viscous fluids such as heavy cruid, syrups and slurries. It is always recommended for flow where Reynolds number is less than 10,000.The inlet is quarter of a circle and the plate thickness must be at least radius of the inlet.
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6) Ring Type Joint –Integral |
Application :
These are available in oval or octal shapes. Orifice plate is a part of RTJ gasket.
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Ring Type Joint- Separate |
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Application :
These are available in oval or octal shapes. The Orifice Plate is Universal type and snap fitted on the RTJ gasket by screws. |
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| B |
Universal Orifice Plates |
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Application :
This is a circular plate designed to fit in the Orifice fittings / Plate holders / carrier rings / Ring Type Joints(RTJ). |
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| Various Orifice Assemblies |
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| WNRF - Flange Taps |
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WNRF - Corner Taps |
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WNRF - Carrier Ring - Flange Taps |
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WNRF - Carrier Ring - Corner Taps |
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Plate Carrier Ring - Flange Taps |
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Plate Carrier Ring - Corner Tab |
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Pipe Taps (D x D / 2) |
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| 1 |
Nipples |
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Ball Valve |
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| 3 |
Valve Manifold |
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| 4 |
Condensing |
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