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Bore Enlargement of a Reactor in a Chemical Plant

5 tons of steel converted into metal cuttings

In August 1998, the internal diameter of an 8 m high reactor vessel was enlarged with a transportable boring device and high-performance cutting tools. Our mechanics worked in shifts – 24 hours a day.

The goal was: to achieve a final diameter of 730 mm (0/+0.35) in the reactor area, and a final diameter of 760 mm (0/+0.35) in the motor area; 35 mm of the radius needed to be bored.

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Cutting tool and bore alignment equipment

This was the first time that such work was carried out on-site.

With these measures, the volume of the reactor vessel was increased by 20%. In 2000, the same work was successfully implemented in a chemical plant in the Middle East.

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Machining of the conical sealing surfaces, upper and lower parts, with the help of a gauge.

Final surface quality: Ra 0.4

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Drivetrain of the drilling equipment.

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Sealing surfaces outside the reactor body.

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Centering device in the lower area for guiding the drill shaft.

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View of the machining phases.

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Progression of the machining process. 

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Beginning of the drilling work – the first cuttings fall to the lower part of the reactor

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Removal of the metal cuttings.