Embedded Fin Tube | G Type Finned Tube

Customize Embedded Finned Tube | G Type Fin Tube of various materials, specifications and surface treatments, and provide thermal calculations, design plans and drawings.

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Embedded Fin Tube | G Type Finned Tube Suppliers in China

Embedded (G-Type) Finned Tubes are high-performance heat exchange components where fins are mechanically locked into grooves cut into the base tube. This “slotted” design creates a robust metal-to-metal bond that provides superior durability, vibration resistance, and thermal efficiency. Specifically engineered for extreme environments like boilers and air-cooled heat exchangers, G-type tubes withstand continuous thermal cycling and high temperatures that would cause standard fins to fail.

Manufacturing Process (The “Embedded” Design)

The name “G-Type” refers to the Groove machined into the base tube. The manufacturing involves three critical steps:

Grooving: A helical groove (typically $0.25\text{mm}$ to $0.30\text{mm}$ deep) is “plowed” into the outer wall of the base tube.
Insertion: The fin strip is wound under high tension into this pre-cut groove.
Back-filling: The displaced tube metal is mechanically pressed back against the base of the fin. This “locks” the fin permanently into the tube wall, ensuring a metal-to-metal contact that is nearly immune to thermal expansion and contraction.

Technical Specification Sheet: G-Type (Embedded) Finned Tube

Specification Category	Dimensional Ranges (Metric & Imperial)	Base Tube & Fin Materials	Max. Operating Temperature	Why this limit? (Rationale)
Base Tube (Core)	Outer Diameter (OD): $15.88\text{mm}$ $50.80\text{mm}$ Wall Thickness (WT): ≥ $\ge 1.65\text{mm}$ (Min)	Base Tube: Carbon Steel, Stainless Steel (304/316L), Alloy Steel (T11/T22/T5), Copper, Cu-Ni Alloys	Aluminum Fins: Up to $400^{\circ}\text{C}$ ( $750^{\circ}\text{F}$ )	Most common for industrial Air Cooled Heat Exchangers (ACHE).
Fin Component	Fin Height: $6.35\text{mm}$ – $15.88\text{mm}$ Fin Thickness: $0.20\text{mm}$ – $0.50\text{mm}$	Fin Material: Aluminum (1050, 1060, 1100), Copper, Carbon Steel	Copper Fins: Up to $450^{\circ}\text{C}$ ( $840^{\circ}\text{F}$ )	Used for marine environments or higher thermal conductivity needs.
Assembly Specs	Fin Pitch: $5$ – $11$ FPI (Fins Per Inch) Max. Length: Up to 25 Meters	Manufacturing Standard: API 661 / Customer Specific	Steel Fins: Up to $550^{\circ}\text{C}$ ( $1022^{\circ}\text{F}$ )	For extreme high-heat waste recovery systems.

G-Type (Embedded) Finned Tube Key Characteristics and Performance

The G-type design offers several distinct advantages that make it a preferred choice for industrial heat exchangers.

Exceptional Mechanical Strength: The primary advantage of the G-type tube is its mechanical integrity. The fin is firmly embedded in the tube’s groove, creating a strong interlock. This results in a high pull-off force (not less than 70N), making the fins highly resistant to damage from vibration, thermal expansion, or mechanical stress during handling and operation.
High-Temperature Resistance: This design is specifically suited for high-temperature services. The secure mechanical bond is maintained even under significant thermal cycling. The maximum allowable medium temperature for G-type finned tubes can reach up to 400°C, making them ideal for applications like petrochemical air coolers and boiler economizers.
Superior Heat Transfer: The tight and continuous contact between the fin and the tube wall ensures excellent thermal conductivity. This minimizes thermal resistance at the interface, allowing for highly efficient heat transfer from the tube to the fins and the surrounding fluid.
Durability and Cleanability: Due to their robust construction, G-type finned tubes are durable and have a long service life. The fins are strong enough to withstand cleaning processes, such as high-pressure water washing, which is often necessary to remove fouling and maintain heat transfer efficiency in industrial settings.

Common Applications of Embedded Fin Tubes

G-Type finned tubes are the industry standard for:

Air Cooled Heat Exchangers (ACHE) in oil refineries and petrochemical plants.
Steam Condensers.
Large-scale Power Plant cooling systems.
High-temperature gas coolers.

Quality Control for Embedded Fin Tube | G Type Finned Tube

The quality of the G type finned tube(embedded fin tube) is assured by hydrostatic or pneumatic testing, eddy current testing and tensile testing to verify the mechanical bond between the inner tube and the outer fins.

Grooved Fin Tube Delivery condition:

Tube ends are square cut, free burrs, internally dried and air blown clean, externally coated with varnish at both ends of G-Fin Embedded Finned Tube.

RFQ

1.Inquiry G-Type (Embedded) Finned Tubes-G Fin —— March 18, 2026

We request you to kindly provide your best competitive quotation for the Finned Tubes as per the attached technical specifications and detailed requirement.

A.Bare tube
Material: SA 179
Size: 25mm X 2.5mm X 10500mm (Min.)

B. FIN
Type : G Fins
Material : SB 209 ALLOY 1060
Size : OD X Stock thickness
57 mm X 0.4 mm (Nom.)
No fins/ inch: 11
Groove Depth : 0.3 mm (Max.)
Unfinned length: 18+25+3= 46 mm on both sides.