Special Orifice Plates

• Below are standard types of Orifice Plates for various applications.
• Mac-Weld will also manufacture your special or custom needs in either stainless steel or exotic alloys to your specifications.
  

Bore & Bevel

• The Bore & Bevel is the standard method of limiting the plate edge thickness.
• The bevel is machined at a 45° angle to the desired edge thickness.
• Unless otherwise specified, plates will be beveled to 1/50 of the line I.D. or 1/8 of the orifice bore, minimum governing.

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• Complete Orifice Plates PDF

Bore & Counterbore

• The Bore & Counterbore is a special method to limit the plate edge thickness.
• Instead of beveling at the normal 45 degrees, the plate is counterbored to the desired edge thickness.

Segmental

• Segmentally bored orifice plates are provided for measurements where solids are entrained in a gas or liquid stearn.
• The circular portion of the bore is inscribed within a circle which is normally 98% of the pipe diameter.
• The segmental opening may be placed at the top or the bottom of the pipe.
• Industries using these bores include, sewage treatment, steel, water conditioning, paper and petrochemical.

Eccentric

• Eccentrically bored plates are plates with the orifice off center, or eccentric, as opposed to concentric.
• The bore of the eccentric orifice normally is inscribed in a circle that is 98% of the pipe diameter, so the solids or slurries may pass through.
• Eccentric orifice plates are used in many industries including heavy and light chemicals, steel, paper, atomic, and petrochemicals.

Quarter-Round

• The Quarter-Round, or Quadrant bore, is an orifice with the inlet edge rounded.
• The radius of the quarter-circle bore is a function of the orifice-to-pipe ratio (d/D).
• Thickness at the throat is equal to the radius.
• Overall plate thickness is frequently greater than for standard plates.
• This bore is specifically designed for fluids of high viscosity, such as heavy crudes, syrups, and slurries.
• Quarter-Round bores are recommended for viscous flows having Reynolds Numbers below 4,000.