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What is double-H type finned tubes?

What is double-H type finned tubes?

The double-H type finned tubes are a type of enhanced heat exchange element that is commonly used in land and marine boilers. The main heat exchange element is a double-H type finned tube, which is distinguished by 1. The fins are welded to the smooth tubes surface. 2. The fin welding contact part has multiple serrations, the heating surface is uniform and securely welded, and the welding leg is uniform and smooth. The penetration rate is 97%, with no slag blowhole weld overlap.

Whats the double-H type finned tubes shape?
Double H type finned tubes include two bare tubes or twin tubes. Outside is rectangle  steel plates welded on both side of bare tubes.
 
Typical Inquiry for the doube H finned tubes.
 

Double H Finned Tubes

Base Tube Material

Fin Material

Tube Length (mm)

Fin length  (mm)

Fin Tube Quantity (Pc)

ASME SA210 A1

Carbon Steel

13000

12900

174

Base Tube O.D (mm)

Base Tube Thickness  (mm)

Fin Height (mm)

Fin Thickness  (mm)

Fin Pitch  (mm)

38.1

3.5

70*145

2.0

5

ASTM A210 is standard Specification for Seamless Medium-Carbon Steel Boiler and Superheater Tubes

Double H Finned Tubes

Double H Finned Tubes

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