Custom P-Type Radiant Tube for Industrial Furnaces

Heat-Resistant Alloy Radiant Tube Assembly | Custom Mounting Plate & Connections | FH® Alloy
FH® Alloy manufactures custom P-type radiant tubes for industrial furnaces and heat treatment equipment, providing complete radiant tube assemblies according to customer drawings, furnace dimensions, operating temperature, atmosphere, and burner system requirements.

The P-shaped configuration combines long straight radiant sections with return bends, creating an extended heating path within a relatively compact furnace space.

This type of radiant tube is suitable for industrial heating systems requiring indirect heating, controlled furnace atmosphere, stable heat distribution, and customized furnace integration.

Product Overview
A P-type radiant tube uses multiple straight tube sections and return bends to form a continuous heating path.
Compared with a conventional straight radiant tube, the P-type structure can provide a longer radiant surface while maintaining a compact installation arrangement.
The product shown can be manufactured as a complete assembly including:

• Main radiant tube sections
  
• Return bends
  
• Mounting plate
  
• Burner-side connection
  
• Outlet / exhaust connection
  
• Support components
  
• Custom installation interfaces
  

FH® Alloy supports both new furnace projects and replacement radiant tube manufacturing.

Typical Specifications

P-Type Radiant Tube Dimensions
Each P-type radiant tube can be manufactured according to the customer’s furnace layout.

Typical dimensional parameters include:

• OD – Tube Outside Diameter
  
• WT – Wall Thickness
  
• L – Overall Length
  
• C – Center Distance
  
• R – Return Bend Radius
  
• W – Overall Width
  
• Mounting plate dimensions
  
• Connection tube diameter
  
• Connection length
  
• Mounting hole dimensions
  
• Burner interface dimensions
  

Drawing Reference

• OD = Outside Diameter
  
• WT = Wall Thickness
  
• L = Overall Length
  
• C = Center Distance
  
• R = Bend Radius
  

All dimensions can be customized according to customer drawings, samples, or existing furnace dimensions.

P-Shaped Multi-Pass Structure
The main difference between a P-type radiant tube and a conventional straight radiant tube is its return-flow geometry.
Multiple straight sections are connected by curved return sections, forming a longer internal flow path.
This design can provide:

• Larger radiant heating surface
  
• Longer heating path
  
• Compact installation arrangement
  
• Flexible furnace layout
  
• Stable heat transfer
  
• Customized burner and exhaust arrangement
  

The exact P-type geometry should be designed according to the actual furnace rather than using one standard dimension for every application.

Heat-Resistant Alloy Materials
Material selection is critical to radiant tube service life.
FH® Alloy can manufacture P-type radiant tubes using different heat-resistant materials, including:

• 1.4848
  
• 1.4849
  
• 1.4852
  
• 2.4879
  
• Cr-Ni heat-resistant alloys
  
• High-Ni heat-resistant alloys
  
• Nickel-based high-temperature alloys
  
• Other customer-specified grades
  

Material selection should consider:

• Operating temperature
  
• Furnace atmosphere
  
• Burner conditions
  
• Thermal cycling frequency
  
• Oxidation conditions
  
• Tube wall thickness
  
• Required service life
  

If the material is not specified, FH® Alloy can provide material-selection support based on the actual furnace operating conditions.

Designed for Indirect Furnace Heating
P-type radiant tubes are commonly used where the burner flame and combustion gases need to remain separated from the furnace working chamber.
Heat is transferred through the radiant tube wall and radiated toward the workpieces inside the furnace.
This arrangement can help provide:

• Controlled furnace atmosphere
  
• Reduced direct flame contact
  
• More stable heating
  
• Uniform temperature distribution
  
• Reliable continuous operation
  

Custom Mounting Plate & Connections
The P-type radiant tube shown uses a custom mounting plate and end-connection structure.
FH® Alloy can customize:

• Mounting plate width and height
  
• Plate thickness
  
• Mounting hole quantity
  
• Hole diameter and position
  
• Burner connection
  
• Exhaust connection
  
• Connection tube diameter
  
• Support structure
  
• Installation orientation
  

This allows the complete assembly to match the customer’s existing furnace interface.

Typical Applications
P-type radiant tubes are widely used in:

• Heat treatment furnaces
  
• Annealing furnaces
  
• Hardening furnaces
  
• Tempering furnaces
  
• Carburizing furnaces
  
• Continuous furnaces
  
• Roller hearth furnaces
  
• Protective atmosphere furnaces
  
• Steel processing lines
  
• Industrial heating systems
  

They are particularly suitable for applications requiring a long radiant heating path within limited furnace space.

Manufacturing Process
Depending on the design, manufacturing may include:
Material Preparation → Tube Production → Straight Section Preparation → Return Bend Fabrication → Assembly → Welding → Mounting Plate Fabrication → Machining → Dimensional Inspection → Surface Cleaning → Final Inspection

Key manufacturing controls include:

• Tube straightness
  
• Wall thickness consistency
  
• Bend geometry
  
• Center distance
  
• Weld quality
  
• Connection alignment
  
• Mounting plate accuracy
  
• Overall dimensional tolerance
  

For complex P-type structures, maintaining correct alignment between multiple tube sections is especially important.

Key Advantages
Extended Heating Path
The P-shaped structure provides a longer radiant path than a simple straight tube.
Compact Furnace Layout
Multiple tube sections can be arranged within a limited furnace installation area.
Custom Heat-Resistant Materials
Material can be selected according to furnace temperature and atmosphere.
Complete Assembly Manufacturing
Tube sections, bends, mounting plates, and connection structures can be supplied as one assembly.
Drawing-Based Production
Suitable for highly customized industrial furnace projects.
Replacement Manufacturing
Existing P-type radiant tubes can be reproduced from drawings, samples, photographs, or dimensional measurements.

Quality Control
Depending on customer requirements, inspection can include:

• Material verification
  
• Chemical composition analysis
  
• Dimensional inspection
  
• Wall thickness measurement
  
• Bend dimension inspection
  
• Center distance inspection
  
• Weld inspection
  
• Mounting plate inspection
  
• Connection dimension inspection
  
• Final assembly inspection
  

Special inspection requirements can be agreed before production.

Why Choose FH® Alloy?
FH® Alloy specializes in custom heat-resistant alloy components for industrial furnaces and heat treatment equipment.
Our radiant tube range includes:

• P-Type Radiant Tubes
  
• U-Shaped Radiant Tubes
  
• I-Type Radiant Tubes
  
• Straight Radiant Tubes
  
• Gas-Fired Radiant Tubes
  
• Special-Shaped Radiant Tubes
  
• Custom Radiant Tube Assemblies
  

We also manufacture:

• Furnace rollers
  
• Centrifugal cast tubes
  
• Heat treatment fixtures
  
• Furnace trays
  
• Furnace baskets
  
• Custom heat-resistant furnace components
  

FH® Alloy supports OEM manufacturing, drawing-based production, replacement projects, and customized alloy selection for international customers.

Request a Quote
For an accurate quotation for your P-type radiant tube, please provide:

1. Technical drawing or sketch
   
2. Tube outside diameter
   
3. Wall thickness
   
4. Overall dimensions
   
5. Center distance
   
6. Return bend dimensions
   
7. Material grade
   
8. Mounting plate dimensions
9. Burner / exhaust connection details
   
10. Operating temperature
    
11. Furnace atmosphere
    
12. Required quantity
    

Send your drawing or existing radiant tube specifications to FH® Alloy for technical review and quotation.

FAQ
Q1: Can you manufacture P-type radiant tubes according to our drawing?
Yes. FH® Alloy specializes in customized manufacturing based on customer drawings, samples, and furnace dimensions.

Q2: What is the difference between P-type and U-type radiant tubes?
A U-type radiant tube normally consists of two main parallel legs connected by one return bend. A P-type radiant tube uses a more complex return-flow arrangement with multiple sections, allowing a longer heating path within the furnace.

Q3: Can the mounting plate be customized?
Yes. Plate dimensions, thickness, mounting holes, connection openings, and installation positions can all be manufactured according to the furnace drawing.

Q4: What materials can be used?
Available options include 1.4848, 1.4849, 1.4852, 2.4879, high-Cr/high-Ni alloys, nickel-based alloys, and other customer-specified heat-resistant grades.

Q5: Can you manufacture replacement P-type radiant tubes?
Yes. Existing products can be reproduced using drawings, samples, photos, or measured dimensions.

Q6: Can you supply the complete radiant tube assembly?
Yes. FH® Alloy can manufacture the tube sections, return bends, mounting plate, connections, and related structural components as a complete assembly.