Product Specification

Alloy Steel L-Foot Tension Wound Finned Tube for Heat Exchangers

Material Introduction

The product is a tension-wound finned tube of the “L-Foot” style, meaning that the fin strip is pre-formed into an “L” shaped foot and helically wound around a base tube under tension. This results in a strong mechanical bond between fin and tube and enhanced heat-transfer performance.
The base tube is made of alloy steel, making it suitable for higher strength, higher temperature, or more demanding environments than simple carbon steel finned tubes.

Specifications

• Base tube material: Alloy steel (can include carbon-moly, chrome-moly alloy or other alloy steel grades) as specified by the customer.

• Fin material: Typically aluminum or copper strip formed into an L-foot profile and wound under tension onto the tube.

• Tube outer diameter (typical range): ~0.5″ to ~2″ (12.7 mm to ~50.8 mm) for L-Foot tension wound fin tubes.

• Fin height: up to ~16 mm (for L-Foot type).

• Fin thickness: around 0.15 mm to 0.6 mm for typical L-type fin tubes.

• Fin pitch: 6 to 12 fins per inch (~2.4 to ~4.8 mm fin spacing).

• Length: Custom according to design requirement.

• Temperature limit: Typical up to ~130 °C (≈270 °F) for basic L-foot fin tubes.

Key Features

• The L-foot profile offers a broad contact area between fin and tube, improving heat conduction.

• Tension-wound fins ensure a firm mechanical bond, resisting loosening under vibration or thermal cycling.

• Alloy-steel core tubes provide higher strength and improved temperature capability versus plain carbon steel.

• Full fin coverage helps protect the tube surface from external corrosion.

Our Advantages

1. Enhanced durability and reliability — Customers often worry about fins loosening over time. The L-foot tension-wound construction prevents this by ensuring consistent mechanical bonding.

2. Improved heat-transfer efficiency — Larger fin-to-tube contact area and tighter winding improve performance, often raising efficiency significantly over standard tension-wound designs.

3. Corrosion protection — Continuous fin coverage and tight adhesion reduce air-side corrosion of the base tube, increasing service life.

4. Material flexibility — Both the alloy-steel tube and fin material can be customized for temperature, corrosion, or mechanical requirements.

5. Cost-effective — Compared with extruded or welded fin tubes, L-Foot tension wound tubes provide excellent performance at a more economical cost level.

Chemical Composition

Mechanical Properties

Applicable Standards

Relevant execution standards for this product include:

• Base tube: ASTM A335 (P9, P11, P22), ASME SA179, ASTM A192, etc.

• Fin materials: Aluminum according to ASTM B209; Copper according to ASTM B152.

• Production specification: Tension-wound L-Foot fin profile, helical wrapping, mechanical locking.

• Testing: Hydrostatic or pneumatic tests, fin adhesion verification, dimensional inspection.

Application Fields

General uses: Heat exchangers requiring increased surface area and higher-performance alloy-steel tubes.

Specific applications include:

• Power plants: Air-cooled condensers, air preheaters, waste-heat recovery units.

• Oil & Gas / Petrochemical: Refinery coolers, process gas coolers, heat-recovery systems.

• HVAC and refrigeration: Condensers, evaporators, industrial air coolers.

• Chemical and food industry: Dryers, heaters, coolers for gas-side heat exchange.

• Marine and offshore: Air coolers exposed to corrosive marine conditions.

Q: Are you trading company or manufacturer ?

A: manufacturer,also can do trading.

Q: How long is your delivery time?

A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,

it is according to quantity.

Q: Do you provide samples? is it free or extra ?

A: Yes, we could offer the sample for free charge but need pay the cost of freight.

Q: What is your terms of payment ?

A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.

If you have another question, pls feel free to contact with me.