Tap Hole: Diameter 50-100 mm, Length 1.5-3.0 m

Component Specifications

Definition

A critical refractory-lined aperture located at the base of a blast furnace hearth, designed to facilitate the controlled periodic discharge of molten iron and slag during the ironmaking process. It consists of a tap hole drill, clay gun, and mud gun systems for opening and sealing operations.

Working Principle

Operates through sequential drilling to open the refractory plug, allowing molten material flow by gravity, followed by injection of refractory clay to seal the opening after tapping completion.

Materials

High-alumina refractory bricks (60-80% Al2O3), carbon blocks, silicon carbide, and specialized tap hole clay (plastic refractory with high alumina/silica content).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	1.5-3.0 m
Diameter	50-100 mm
Flow Rate	5-8 tons/minute
Tapping Duration	60-120 minutes
Refractory Thickness	800-1200 mm
Operating Temperature	1450-1550°C

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 10081, DIN 51061, ASTM C27

Parent Products

This component is used in the following industrial products

Hearth

The bottom section of a blast furnace where molten iron and slag accumulate before tapping.

View Product Details

Engineering Analysis

Risks & Mitigation

Refractory failure leading to breakout
Thermal stress cracking
Incomplete sealing causing gas leakage
Equipment misalignment during drilling
Molten material splashing during tapping

FMEA Triads

Trigger: Excessive refractory erosion from chemical attack
Failure: Premature tap hole wear and potential breakout
Mitigation: Regular refractory quality testing and optimized clay composition

Trigger: Improper drilling angle or depth
Failure: Off-center tap hole causing uneven flow
Mitigation: Laser-guided drilling systems and operator training

Trigger: Inadequate clay injection pressure
Failure: Incomplete sealing and gas leakage
Mitigation: Automated pressure monitoring and clay gun maintenance

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±2 mm diameter, ±5° alignment angle

Test Method

Ultrasonic thickness testing, thermal imaging, refractory sample analysis per ASTM C133

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.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Tap Hole

Manufacturer profiles associated with Tap Hole.

Sourcing Tap Hole from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.

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

Related Components

Valve Body

Valve body is the main structural housing of a molten metal flow control valve, designed to withstand extreme temperatures and corrosive environments while directing metal flow.

Refractory Liner

Refractory liner for molten metal flow control valves, providing thermal insulation and erosion resistance in extreme temperature applications.

Work Rolls

Work rolls are precision cylindrical components in heavy-duty rolling mills that directly contact and deform metal during rolling operations.

Venting Channels

Venting channels are precision-engineered passages in metal casting mold cores designed to allow gases to escape during the molten metal pouring process, preventing defects and ensuring high-quality castings.

Frequently Asked Questions

What is the primary function of a tap hole in a blast furnace?

To provide a controlled opening for discharging molten iron and slag from the furnace hearth while maintaining structural integrity and thermal efficiency.

How often should tap hole refractory be replaced?

Typically every 6-12 months depending on operating conditions, with daily maintenance using tap hole clay to repair erosion between campaigns.

What are common tap hole failure modes?

Refractory erosion, thermal cracking, clay adhesion failure, improper drilling alignment, and mechanical damage from tapping equipment.

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.

Tap Hole