& Pressure Vessel Repairs
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ABOVE: Smoke tube ends projecting into the boiler combustion chamber. This type of attachment is vulnerable to overheating and subsequent failure.
ABOVE: Tube end failure is reduced considerably by removing the projections and maching a "J" type weld preparation around the tube ends to a depth of the tube wall thickness plus 3mm as detailed in B.S. 2790.
|LEFT: The tubes are then welded flush in a minimum of 2 runs using the overlay method, thus reducing the risk of porosity. On completion of welding, the tubes are lightly re-expanded; all excess weld metal is removed, a small radius is machined on the tube bore and a dye penetrant check carried out.|
|© 2011 CH Thompson|