H / double H fin tubes (TYPES“, Double S“)
Steel H
Pairs of parallel shaped steel fins are resistance welded to the single pressure tubes (pipes) surface under very carefully controlled conditions.The purpose build welding machine ensures very precise indexing along the entire length of the tubes (pipes) and exact parallel attachment.
Double H 
A development of the single tubes (pipes) version, the 'Double H' design has the steel fins welded onto two tubes at the same time. For applications with cleaner gases the use of 'Double H' can reduce the number of supports required due to its inherent stiffness.
Configurations
As a general guide, spacing of tubes (pipes) centres is usually in the range of 2-3 times the tubes (pipes) O/Dia.
. tubes (pipes) O/Dia. [OD] mm - 31.8 to 57.2
. tubes (pipes) Length [L] Metres - Up to and including 18 Metres maximum
. Vertical Centres [V] mm - 65 to 133
. Horizontal Centres [H] mm - 65 to 178
. Fin Thickness [t] mm - 2.0, 2.5, 3.0 (certain fin shapes can be 1.5mm thick material)
. Fin Density [P] mm - Minimum 10mm, i.e. 100 Fins Per Metre (FPM)
. Fin Shape - Over 75 fin shapes as standard, with new fin shapes continually being developed.
Bespoke fin shapes are produced to suit the design application where feasible.
Base tubes (pipes) Material
Typically Carbon, Corten, Low alloy steels.
Tubes quality / type can be Cold Drawn Seamless [CDS], Hot Finished Seamless [HFS], Electric Resistance Welded [ERW].
Fin Material
Carbon Steel Hot Rolled [HR4], Corrosion resisting steels i.e. Corten.
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