Gas Inlet Bustle for Direct Reduction Shaft Furnaces

Product Specifications

Technical details and manufacturing context for Gas Inlet Bustle

Definition

The Gas Inlet Bustle is a specialized piping assembly that serves as the primary gas distribution manifold in a Direct Reduction Shaft Furnace. It receives hot reducing gases (typically a mixture of hydrogen, carbon monoxide, and natural gas) from the main gas supply system and distributes them uniformly to multiple tuyeres or injection nozzles positioned around the furnace's circumference. This ensures consistent gas flow and pressure to all injection points, which is essential for maintaining uniform reduction conditions throughout the furnace burden. The bustle is typically constructed as a large-diameter circular or semi-circular pipe that encircles the furnace shaft, with multiple branch connections to individual injection points. In basic metal manufacturing, the bustle is a key component for efficient and reliable operation of the direct reduction process. Its design must accommodate high temperatures and pressures, as well as the corrosive nature of the reducing gases. The bustle is usually made of heat-resistant alloy steel, lined with refractory materials, and equipped with high-temperature gaskets and seals to prevent leaks. The number of injection points typically ranges from 8 to 16, ensuring even distribution around the circumference. The inner diameter of the bustle is typically between 800 and 1200 mm, with a wall thickness of 20 to 40 mm, depending on the required pressure and corrosion allowance. The design pressure is typically 1.0 to 1.6 MPa, and the design temperature ranges from 400 to 600°C. The material grade for high-temperature hydrogen service is often ASTM A387 Gr.22, and the surface finish is typically Ra 3.2 to 6.3 µm to prevent gas channeling. The leakage rate at design pressure is ≤0.1%. The weight of the bustle can range from 1500 to 3000 kg, depending on size and material. For procurement, it is essential to verify model-specific values and standards with the legal manufacturer or supplier, as these are reference ranges and not guaranteed specifications.

Working Principle

The Gas Inlet Bustle operates on fluid distribution principles. Hot reducing gases enter the bustle through one or more main inlet connections. The bustle's large cross-sectional area and circular design help maintain consistent pressure throughout the system. The gases then flow through multiple branch pipes or tuyeres that connect to injection nozzles positioned at regular intervals around the furnace. This design ensures that each injection point receives approximately equal gas flow, which is critical for achieving uniform reduction reactions across the entire furnace cross-section. Pressure regulators and flow control valves are typically integrated into the bustle system to manage gas distribution.

Common Materials

Heat-resistant alloy steel, Refractory lining materials, High-temperature gaskets and seals

Technical Parameters

Parameter	Typical range	Notes & selection driver
Design Pressure	1.0–1.6 MPa
Design Temperature	400–600 °C	Above 600°C material creep becomes critical
Inner Diameter	800–1200 mm	Determines gas flow capacity
Wall Thickness	20–40 mm	Pressure and corrosion allowance
Number of Injection Points	8–16	Even distribution around circumference
Material Grade	ASTM A387 Gr.22	For high-temperature hydrogen serviceASTM A387
Surface Finish	Ra 3.2–6.3 µm	Smooth to prevent gas channeling
Leakage Rate	≤0.1 %	At design pressure
Weight	1500–3000 kg	Depends on size and material

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

Components / BOM

Main Bustle Pipe Part
Primary gas distribution conduit that encircles the furnace

Material: Heat-resistant alloy steel
Branch Connections
Connect main bustle to individual injection nozzles or tuyeres

Material: Alloy steel with expansion joints
Refractory Lining Part
Insulates bustle pipe from high-temperature gases

Material: High-alumina refractory
Support Structure Part
Supports bustle weight and accommodates thermal expansion

Material: Structural steel
Pressure Regulator
Holds the bustle at working pressure so every tuyere sees the same supply.
Flow Control Valve
Trims gas flow to each branch so the reduction is even around the furnace.

Application & selection

Application Fit & Sizing Matrix

Operational Limits

pressure:	Up to 5 bar (gauge) maximum design pressure
flow rate:	50,000-200,000 Nm³/h (depends on furnace capacity)
temperature:	200-450°C (typical operating range for reducing gases like H2/CO mixtures)
slurry concentration:	Not applicable (gas-only component)

Media Compatibility

✓ Hydrogen-rich reducing gases (H2/CO mixtures) ✓ Natural gas reformed gases ✓ Syngas from coal gasification

Unsuitable: Oxygen-containing environments (risk of oxidation/combustion)

Sizing Data Required

Total reducing gas flow rate (Nm³/h)
Number of injection points around furnace circumference
Furnace internal diameter and bustle positioning requirements

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause

Thermal fatigue cracking

Cause: Cyclic thermal stresses from rapid temperature fluctuations during gas flow variations, leading to crack initiation and propagation in the bustle material, often exacerbated by inadequate thermal expansion accommodation.

Corrosion-induced thinning

Cause: Chemical attack from corrosive contaminants (e.g., H2S, CO2, chlorides) in the gas stream, combined with moisture condensation, resulting in material degradation and localized thinning, particularly at welds and stress concentration points.

Maintenance Indicators

Audible gas leakage or hissing sounds from the bustle joints or body, indicating seal failure or crack development.
Visible external discoloration, bulging, or localized hot spots on the bustle surface, suggesting internal corrosion, material thinning, or insulation breakdown.

Engineering Tips

Implement regular non-destructive testing (NDT) such as ultrasonic thickness gauging and thermal imaging to monitor wall thickness and detect early-stage corrosion or thermal anomalies before failure occurs.
Optimize gas stream conditioning by installing upstream moisture separators and corrosion inhibitors to reduce corrosive contaminants, and ensure proper thermal insulation to minimize thermal cycling stresses on the bustle structure.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards

ISO 10497:2010 (Fire testing of valves) ANSI/ASME B16.5 (Pipe flanges and flanged fittings) DIN EN 1092-1 (Flanges and their joints)

Quoted from the published standard.

Manufacturing Precision

Bore diameter: +/-0.05mm
Flange flatness: 0.1mm per 100mm diameter

Quality Inspection

Hydrostatic pressure test
Dimensional verification with CMM

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

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Inspection readiness

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Supplier transparency

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Manufacturers of Gas Inlet Bustle

Manufacturer profiles associated with Gas Inlet Bustle.

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Frequently Asked Questions

What is the primary function of a Gas Inlet Bustle?

The Gas Inlet Bustle receives hot reducing gases from the main supply system and distributes them evenly to multiple injection points around the furnace circumference, ensuring uniform reduction conditions.

What materials are typically used in the construction of a Gas Inlet Bustle?

Typical materials include heat-resistant alloy steel, refractory lining materials, and high-temperature gaskets and seals. The material grade for high-temperature hydrogen service is often ASTM A387 Gr.22.

What are the typical design parameters for a Gas Inlet Bustle?

Design pressure is typically 1.0–1.6 MPa, design temperature 400–600°C, inner diameter 800–1200 mm, wall thickness 20–40 mm, and number of injection points 8–16. These are reference ranges; verify with the manufacturer.

How does the Gas Inlet Bustle ensure even gas distribution?

The bustle's large cross-sectional area and circular design maintain consistent pressure, and multiple branch pipes connect to injection nozzles at regular intervals, ensuring approximately equal gas flow to each point.

Related equipment

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Direct Reduction Shaft Furnace

View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems

Downstream Applications

Specialized Tooling

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

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