Cast Iron Protected
In applications where corrosion is possible, the pressure tubes are clad with spigoted cast iron sections and then expanded to ensure perfect thermal and mechanical integrity. The interlocking spigot design of the cast iron sleeves ensures the base tube is totally isolated from the corrosive gas elements.

Proved in many thousands of installations, the cast iron clad types are always used in sulphuric acid plant and where gas temperatures may fall below their acid dew point.

Combinations of Steel H in the hotter gas zones and cast iron in the cooler areas are frequently the ideal choice.

Configurations:

Type 55 / Type 555
• Square Fin, 19mm (0.75") Pitch.
• 50.8mm (2") O/Dia. Tubing.
• 127mm (5") x 127mm (5") Tube Centres.

Type FC
• Round Fin.
• 50.8mm (2") O/Dia Tubing.
• Fin sizes available - 117.5mm (4.625") O/Dia. 88.9mm (3.5") O/Dia. Corrugated Fin.

'Marine Economiser' Type
• Round Fin.
• 38.1mm (1.5") O/Dia. Tubing.
• 88.9mm (3.5") O/Dia. Fin.Base Tube Material

Typically Carbon Steels
Preferred quality / type is Cold Drawn Seamless [CDS].

Fin Material
Cast Iron - Grade 220 (or equivalent)