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Reg. 152
BOILER AND SUPER-HEATER TUBES SUBJECT TO INTERNAL PRESSURE

 

Attachment of Steel Tubes

a) Tubes shall be connected to the tube plates by one of the following methods:-

1) Expanding.
2) Strength welding.
3) Mechanical bolted ball joint.
b) Drift or roller expanded tubes shall project through the neck or bearing part in the holes by at least a quarter of an inch and shall be secured from drawing out by being bell mouthed to the extent of 1/32” for each inch in diameter plus 2/32”.
c) Tubes may be seal welded into fittings or headers for both boilers and super heaters after they have been expanded and flared provided the material in the fittings or headers does not contain carbon in excess of 0.35 per cent.
d) In the case of drifted or roller expanded tubes, the tube holes in the tube plates of drums, pockets, or headers shall be formed in such a way that the tubes can be effectively tightened in them. Where the tube ends are not normal to the tube plate, there shall be a neck or belt of parallel seating of at least ½ inch depth measured in a plane normal to the axis of the tube at the holes.
e) Where tubes are strength welded direct to the tube plates, the technique followed shall be approved by the Inspecting Authority and all welds shall be suitably heat treated. In the case of plates below 22 mm thickness, the requirement of stress relieving by heat treatment after welding of the tubes may be waived provided the weld satisfies the requirements concerning the maximum hardness and also the requirements concerning the impact values of the weld metal. The welding procedure adopted and the weld sequence selected shall also be subject to the approval of the Inspecting Authority. This provision is applicable to only shop welding of tubes at the Manufacturer’s Works.
f) Tube spacers, supporting clips and lugs may be welded to the tubes. Flash welding of studs for supporting refractories, etc., is also permissible.
g) The tubes shall be so arranged that they are accessible for cleaning internally and externally.
 
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Message from Chairman of Central Boilers Board About Central Boiler Board History of Indian Boiler Regulations Foreword Contents Chapter Wise Contents Regulation Wise List of Amendments
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