INDUSTRY COMPONENT

Orifice Bore

Precision-engineered opening in an orifice plate for accurate fluid flow measurement and control in industrial systems.

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Component Specifications

Definition
The orifice bore is the precisely machined circular opening in an orifice plate, a primary element in differential pressure flow measurement systems. It creates a constriction in the fluid flow path, generating a measurable pressure drop that correlates to flow rate according to Bernoulli's principle and continuity equations. The bore's geometry, edge sharpness, and dimensional accuracy are critical for measurement precision.
Working Principle
Creates a controlled flow restriction, converting kinetic energy to pressure energy. The pressure differential across the bore (upstream vs. downstream) is measured and calculated using standardized equations (ISO 5167) to determine volumetric or mass flow rate.
Materials
Stainless steel (AISI 304/316), Hastelloy, Monel, carbon steel, or specialized alloys matching process fluid compatibility; hardness ≥150 HB; surface finish Ra ≤ 0.8 μm.
Technical Parameters
  • Taper ≤ 0.0005d
  • Thickness 1/8 to 1/2 plate thickness
  • Bore Diameter 0.25-12 inches (6-300 mm)
  • Concentricity ≤ 0.005D
  • Edge Sharpness ≤ 0.0004d radius
  • Diameter Ratio (β) 0.2-0.75
Standards
ISO 5167, ASME MFC-3M, DIN 1952

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Orifice Bore.

orifice bore flow measurement orifice plate differential pressure ISO 5167 beta ratio flow coefficient process control Orifice Bore in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Orifice Plate

A precisely machined plate with a calibrated hole used to control and measure fluid flow within a quench nozzle or injector system.

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Orifice Plate/Insert

A precision component with a calibrated opening that controls and meters fluid flow within a steam or spray nozzle assembly.

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Engineering Analysis

Risks & Mitigation
  • Erosion/corrosion altering bore geometry
  • Fouling/blockage affecting flow
  • Improper installation causing flow distortion
  • Thermal expansion mismatch
FMEA Triads
Trigger: Abrasive particle impingement
Failure: Bore diameter increase >0.5%, edge rounding
Mitigation: Hard-faced materials, upstream filtration, regular calibration
Trigger: Cavitation in high ΔP applications
Failure: Pitting erosion, noise/vibration
Mitigation: Limit ΔP to <0.25P1, multi-stage orifice plates

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.05% of bore diameter for d≥50mm, ±0.1% for d<50mm per ISO 5167-2
Test Method
Optical comparator measurement, air gauge calibration, flow calibration against master meter

Buyer Feedback

★★★★☆ 4.5 / 5.0 (25 reviews)

"The technical documentation for this Orifice Bore is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Orifice Bore so far."

"Testing the Orifice Bore now; the technical reliability results are within 1% of the laboratory datasheet."

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Frequently Asked Questions

What is the beta ratio in orifice bore design?

Beta ratio (β) is the ratio of bore diameter to pipe internal diameter (d/D). Critical for flow calculation accuracy, typically maintained between 0.2-0.75 per ISO 5167.

How does bore edge condition affect measurement?

Sharp, square edges (≤0.0004d radius) ensure consistent vena contracta formation and predictable pressure drop. Worn or rounded edges cause flow coefficient drift and measurement errors up to 5%.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Orifice Orifice Insert / Nozzle