Crimped Fin Tube (Helically Tension Wound, Cold-Formed Finned Tube) for Air Coolers

Material

A Crimped Fin Tube (also called a Spiral Tension Wound / Cold-Formed Finned Tube) is a heat-transfer tube where a metal fin strip is helically wound under controlled tension onto a base tube. The fin strip is pre-formed to widen the contact “foot,” then mechanically locked to the tube surface (with end fixing such as tack/tag welding or spot welding depending on design).

Common material options (customizable):

• Base tube: carbon steel, stainless steel, alloy steel, copper, titanium, duplex stainless, nickel alloys (project-dependent).

• Fin strip: aluminum, copper, carbon steel, stainless steel.

Specifications

Typical configurable ranges (final dimensions per drawing / datasheet):

• Base tube OD: 15.88–219.00 mm

• Base tube wall thickness: ≥ 1.00 mm

• Tube length: 500–15000 mm

• Fin thickness: 0.15–2.00 mm

• Fin height: 6.0–25.40 mm

• Fin density / pitch: 3–11 FPI (typical)

• Bare ends: as required (for rolling, welding, flanging, or tube-to-tubesheet joints)

Main Features

• Enhanced air-side performance: crimped fins increase turbulence and improve air-side heat transfer effectiveness.

• Reliable mechanical bond: pre-formed fin foot increases contact area; fin ends are secured to stabilize the wrap.

• Good mechanical resistance: suited for air coolers and finned-tube exchangers where vibration and handling strength matter.

• Cleaner airflow channel: uniform pitch design helps reduce ash/dust accumulation and supports easier maintenance.

• Cost-efficient surface area gain: increases external surface area without moving to heavier welded-fin constructions (project-dependent).

Our Advantages

1) “Will the fins loosen over time?”
We use a controlled tension-winding process with a pre-formed fin base to increase contact area, and the fin ends are secured (tag/tack/spot fixed as specified) to stabilize the wrap for service and transport.

2) “What temperature is this fin type suitable for?”
Crimped / spiral tension-wound fin tubes are commonly positioned for moderate temperature duty (a typical stated limit is up to ~120°C, depending on configuration and materials). For higher-temperature duty or severe thermal cycling, we can propose alternative fin constructions (e.g., embedded or welded fin types) during selection.

3) “How do I select base tube and fin materials for corrosion?”
We support multiple material combinations—carbon steel, stainless steels, copper and more—so you can match process-side corrosion (base tube) and ambient-side corrosion (fin material) to the real operating environment.

4) “Will it foul easily in dusty air?”
The crimped fin geometry can be supplied with uniform pitch and practical fin profiles to reduce dust bridging and help keep airflow paths serviceable.

5) “Do you provide inspection documents and traceability?”
We can provide EN 10204 3.1 / 3.2 material certification and support third-party inspection where required by the project ITP.

6) “Does this fit refinery / petrochemical air-cooler procurement practice?”
For oil & gas air cooler projects, procurement is commonly aligned with API 661 requirements; we can supply finned tubes as part of an overall documentation package consistent with air-cooled heat exchanger procurement workflows.

Chemical Composition

Mechanical Properties

Execution Standards

ASTM / ASME (typical base tube options): ASTM A179, ASTM A192, ASTM A210, ASTM A213 (stainless).
Air cooler / exchanger practice: API 661 (commonly used for refinery air-cooled heat exchangers).

EN (common equivalents): EN 10216 (seamless tubes for pressure purposes), EN 10217 (welded tubes for pressure purposes), EN 10204 3.1/3.2 certification.

GOST (common equivalents): GOST 8732 / 8734 (seamless steel pipes), GOST 9941 (stainless seamless tubes).
JIS (common equivalents): JIS G3461 / G3462 (boiler & heat-exchanger tubes), JIS G3459 (stainless steel pipes).
GB (common equivalents): GB/T 3087 (boiler tubes), GB/T 5310 (high-pressure boiler tubes), GB/T 8163 (seamless steel pipes for fluid service), GB/T 14976 (stainless seamless pipes for fluid transport).

Application Fields

Broad application: air coolers and finned-tube heat exchangers where the outside medium is air/gas and needs added surface area.

Where it’s used within those fields:

• Refinery / petrochemical air coolers: tube bundles for air-cooled heat exchangers aligned with common procurement practice.

• Dryers, radiators, heaters: finned sections to boost convective heat transfer on the air side.

• Oil cooling & industrial cooling coils: finned tube cores used in cooling units and similar air-side duty.

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.