APPLIED FIN TUBE

Spiro-Gills: The UK Leader in Finned Tube Technology

Spiro-Gills Products Ltd is the United Kingdom’s leading manufacturer of high-performance finned tubes used in air-cooled heat exchangers. In many industrial settings—especially in the oil, gas, petrochemical, and power generation sectors—the availability of clean cooling water is either limited or prohibitively expensive. As a result, air-cooled systems using finned tubes have become the preferred choice for efficient heat rejection across the globe.

With decades of engineering excellence and a reputation for durability, Spiro-Gills finned tubes are trusted by top-tier process facilities and power plants worldwide. Their solutions are designed to meet the highest performance standards while reducing environmental impact and operational costs.

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High-Quality Finned Tubes for Air-Cooled Heat Exchangers

Precision-Engineered by Spiro-Gills for Maximum Heat Transfer Efficiency

At the core of every air-cooled heat exchanger lies its most critical component — the extended surface area, where heat is effectively transferred. This is typically made up of helical high-finned tubes, engineered to maximize surface area and optimize thermal performance. Over time, these tubes can deteriorate due to corrosion, fouling, erosion, or mechanical damage—impacting both fins and base material. Regular replacement is essential for maintaining peak efficiency and system reliability.

Replacement Finned Tubes – When You Need Them Most

Whether you're preparing for a scheduled shutdown or facing an emergency replacement, Petromarsh can supply custom finned tubes that match your specifications. We offer fast turnaround and dependable delivery to minimize downtime.

Advanced Finning Technology

Our finned tubes are manufactured using state-of-the-art McElroy finning machines, recognized as the industry’s most reliable and efficient systems for producing applied finned tubing. These machines allow us to maintain tight tolerances, superior bonding quality, and consistent performance across large volumes.

Finning Methods We Offer

We supply applied finned tubes using four proven manufacturing techniques, each tailored to suit specific applications, materials, and environmental conditions. [Note: These methods can be detailed below or linked to a separate section for technical comparison.]

Why Choose Petromarsh & Spiro-Gills for Finned Tubes?

UK-Manufactured Quality with global reliability
Precision finning using McElroy equipment
Custom solutions for all tube and fin material combinations
Fast production and delivery for urgent or planned needs
Highly competitive pricing without compromising on quality

Need help selecting the right finned tube solution?
Contact us today — our team will assist you in choosing the best configuration for your heat exchanger system and operating environment.

THE TYPES OF FINNED TUBE

SGG-Fin - Grooved Fin (Embedded Fin)

Application: High-efficiency fin for high operating temperatures Upper limiting temperature: 400°C

Manufacture: A helical groove is formed in base tube displacing of material and fin is wound into the groove under tension, followed by backfilling of the displaced material to lock the fin root into the tube.

Fin materials: Aluminium Base tube materials:
Any readily machinable material

SG-LL Fin (Overlapped L Fin)

Application: Standard fin for low-temperature applications giving increased atmospheric corrosion protection of the base tube.

Upper limiting temperature: 180°C

Manufacture: Fin foot is pre-formed into an LL shape (overlapped LL) and applied to base tube under tension. However, foot is pre-shaped to give overlap of one foot onto another, thereby improving base tube protection and thermal contact area

Fin materials: Aluminium

Base tube materials: Any metallic material

SG-L Fin (Wrapped Fin)

Application: Standard fin for low-temperature application where some degree of tube wall protection is required Upper limiting temperature: 120°C

Manufacture: Fin foot is pre-formed into L shape and applied to base tube under tension. The adjacent fins abut one another, giving a degree
of base tube protection for less aggressive environments

Fin materials: Aluminium

Base tube materials: Any metallic material

SG-K Fin (Knurled L Fin)

Application: Standard fin for medium-temperature applications, giving increased atmospheric corrosion protection to the outer surface of the base tube

Upper limiting temperature: 250°C

Manufacture: Fin foot is pre-formed into an L shape and applied to base tube under tension. Knurling tools both precede and follow the laying down of the fin foot so that the fin material is locked into the pre-knurled tube. This gives up to 50% greater thermal contact area than standard L fin and also ensures an airtight fin to tube bond, resulting in greater tube protection

Fin materials: Aluminium

Base tube materials: Any metallic material

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