INDUSTRY COMPONENT

Orifice Insert

Precision orifice insert for regulating gas flow in blast furnace burner nozzles

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Component Specifications

Definition
A precision-engineered orifice insert is a critical flow control component installed within blast furnace gas burner nozzles. It features a calibrated orifice that precisely meters and regulates the flow rate of blast furnace gas (BFG) to ensure optimal combustion efficiency, flame stability, and temperature control in industrial heating applications. The insert is designed to withstand high temperatures, corrosive gas compositions, and thermal cycling.
Working Principle
The orifice insert operates on the principle of flow restriction and pressure drop. As blast furnace gas passes through the precisely machined orifice, a controlled pressure differential is created across the insert. This differential, governed by the orifice diameter and geometry (following standards like ISO 5167), regulates the volumetric flow rate according to the square root relationship between flow and pressure drop, ensuring consistent and predictable gas delivery to the burner tip for stable combustion.
Materials
High-temperature nickel-chromium alloys (e.g., Inconel 600/601, Hastelloy X) or heat-resistant stainless steels (e.g., AISI 310, 330) with optional ceramic coatings (alumina, zirconia) for enhanced erosion and corrosion resistance. Material must withstand continuous operation at 800-1200°C and resist carburization and sulfidation from BFG.
Technical Parameters
ParameterTypical rangeNotes & selection driver
MountingThreaded (NPT, BSP) or flanged
Surface FinishRa ≤ 1.6 μm
Pressure RatingUp to 5 bar
Orifice Diameter2-20 mm (calibrated)
Temperature Range800-1200°C
Flow Coefficient (Cv)0.5-10

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
ISO 5167, DIN 1952, ASME MFC-3M

Parent Products

This component is used in the following industrial products

Blast Furnace Gas Burner Nozzle

High-temperature nozzle for injecting and atomizing blast furnace gas in steelmaking furnaces

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Underflow Apex

The conical discharge section at the bottom of a hydrocyclone separator that collects and directs the denser underflow stream.

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Engineering Analysis

Risks & Mitigation
  • Orifice clogging from particulates in BFG
  • Thermal fatigue cracking due to cycling
  • Erosion/corrosion from gas impurities
  • Incorrect flow due to improper sizing or installation
FMEA Triads
Trigger: Accumulation of dust, tar, or slag particles in the gas stream
Failure: Partial or complete blockage of the orifice, leading to reduced or unstable gas flow, flame instability, and inefficient combustion
Mitigation: Install upstream gas filtration; implement regular inspection and cleaning schedules; use self-cleaning orifice designs or coatings
Trigger: Repeated thermal cycling between operating and shutdown temperatures
Failure: Thermal fatigue cracks in the insert material, potentially causing gas leaks, structural failure, or dislodgement
Mitigation: Use alloys with high thermal fatigue resistance; design for gradual heating/cooling; apply thermal barrier coatings
Trigger: Erosive particles or corrosive gases (H2S, CO2) in the BFG
Failure: Gradual enlargement or pitting of the orifice, altering flow characteristics and reducing accuracy
Mitigation: Specify erosion/corrosion-resistant materials (e.g., Hastelloy); apply hard ceramic coatings; monitor flow rates for deviations

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Orifice diameter: ±0.05 mm; concentricity: 0.1 mm TIR; surface finish: Ra ≤ 1.6 μm
Test Method
Flow calibration per ISO 5167 using air or nitrogen at standard conditions; pressure testing at 1.5x operating pressure; material certification per ASTM/EN standards

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Orifice Insert

Manufacturer profiles associated with Orifice Insert.

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Frequently Asked Questions

What is the primary function of an orifice insert in a blast furnace gas burner?

It precisely meters and regulates the flow of blast furnace gas to the burner, ensuring stable combustion, optimal flame characteristics, and efficient heat output by controlling the gas pressure and flow rate.

Why are high-temperature alloys used for orifice inserts?

Blast furnace gas burners operate at extreme temperatures (often above 800°C) and expose components to corrosive gases. Nickel-chromium alloys like Inconel provide essential resistance to oxidation, carburization, thermal fatigue, and mechanical degradation under these harsh conditions.

How is the orifice diameter determined?

The diameter is calculated based on required gas flow rate, upstream/downstream pressures, gas composition, and temperature, following flow equations from standards like ISO 5167. It is precision-machined to tight tolerances (typically ±0.05 mm) to ensure accurate flow control.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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