CAST IRON PROTECTED TUBES

Cast iron gilled surface was one of the first type of extended surface utilised in the economisers with steel tubes.

 

The purposes of the cast iron protection are :

1) Provide surface extension
2) Provide protection to the inner steel tubes against corrosion and/or erosion.

MANUFACTURING DESCRIPTION

1. Checking of tube diameter; sometimes the tube must be machined (grinded) in order to obtain a precision of the diameter up to 1/100 mm;
2. cast iron sleeves are machined on the extremities to realise between one sleeve and the other a spigot and socket connection;
3. inside machining of cast iron sleeves, to obtain a regular surface on the internal diameter of the sleeve machined in the order of 1/100 mm, note that the internal diameter of the sleeve is lower than the outer diameter of the tube;
4. Fitting of the cast iron sleeves on the tube : this is the final step of the manufacturing; the shrinking is obtained heating the cast iron sleeves in a specific heater and then fitting them one by one or in couples on the tubes;

At the end of manufacturing the cast iron gilled sleeves are in intimate contact on 100% of the tube surface, thus ensuring a very performant heat transfer.

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