Why Steel H?
Economisers are required to operate reliably in dirty and potentially corrosive environments. Since the introduction of Steel ‘H’ Finned Tubes in the 1950’s, leading boilermakers and specifiers have adopted this product as the ideal heating surface for the modern high pressure boiler Economiser; helping to ensure long availability of boiler operation, and minimising generating and maintenance costs, whatever fuel is being fired.

Steel H
Pairs of parallel shaped steel fins are resistance welded to the single pressure tube surface under very carefully controlled conditions.

The purpose build welding machine ensures very precise indexing along the entire length of the tube and exact parallel attachment.

Configurations
As a general guide, spacing of tube centres is usually in the range of 2-3 times the tube O/Dia.
• Tube O/Dia. [OD] mm - 31.8 to 57.2
• Tube 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 Tube 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.