TPi October 2010

developments products &

Efficient blast cleaning of steel pipes

Terex Cranes, a leading crane manufacturer, has purchased the new Rösler RDR 500 pipe blaster for its plant in Zweibruecken, Germany. At this location Terex produces lattice boom cranes with a payload of more than 300 tons, which can move under full load (‘pick & carry’). Models manufactured at the site include the CC 8800-1 Twin, which can lift 3,200 tons and still move under full load. An essential section of this type of crane is the lattice boom that is fabricated from steel tubes of different diameters and lengths. The RDR 500 tube/pipe blaster allows Terex to de-scale and de-rust tubes with a length of up to 18,000mm and a diameter of up to 500mm, prior to flame cutting. A major factor in choosing the RDR was that Rösler had already supplied a number of nearly identical tube blast systems to OEMs and steel trading companies. Another important point was that Rösler was able to adapt the machine design to the Terex requirements by conducting processing trials in the Rösler test lab. The trials showed that the required degree of cleanliness, according to the Swedish Standard of SA 2.5 (‘near white’) surface conditions are achieved in the machine with travel speeds from 2 to 6.5m/ min due to the two high performance Hurricane ® H42 blast wheels, which are driven by 22kW motors. These easy- to-maintain single disk blast wheels are mounted sequentially on the blast chamber.

The precisely defined blast angle ensures that the required blast results are consistently achieved in the specified time, even with tubes of a relatively large diameter. Since the Terex specifications only call for the blast cleaning of the outer tube surface, the open tube ends are masked. However, Rösler also offers solutions for applications where blast cleaning of the inside and outside of the tubes is required. Transport of the tubes through the blast machine, which is equipped with an entrance and exit vestibule, takes place with two 18m-long roller conveyors with a rated load of 500kg perrunningmetre.Theblast- cleaned tubes are directly transported from the exit

Steel tubes are transferred into the shot blast machine with a roller conveyor

Universal bronze

vestibule into the flame cutting system. Since the supplier of the flame cutting system, HGG Profiling Equipment BV from the Netherlands, and Rösler have a long-term and friendly cooperation, the interface issues between the controls of the two systems were easily resolved. Besides blast performance and a robust machine construction, the maintenance- friendly design of the tube blaster was another factor that convinced Terex to buy the Rösler equipment. Very large inspection/maintenance doors in the entrance and exit vestibules, as well as in the blast chamber, allow easy

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The blast chamber itself is fabricated from wear resistant manganese steel.

and ergonomic access to all areas requiring maintenance. The maintenance door in the blast chamber is protected against wear from the blast by slide-in manganese plates that cover the inspection door without showing any gap. Rösler Oberflächentechnik GmbH – Germany

The two Hurricane H42 blast wheels are driven by 22kW motors

Ampco Metal SA – Switzerland info@ampcometal.com www.ampcometal.com

info@rosler.com www.rosler.com

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October 2010 Tube Products International