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Vol. 7
March Issue
Year 2006
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Articles


in Vol. 7 - March Issue - Year 2006
Blasting Pipes In Second Pulses



Transport of the pipe via Diabolo-rolls


The one disc wheel of AGTOS-high performance turbine


Sight of the pipe separation before the blasting process

For fire protection installation of medium sized projects up to major orders CALANBAU Ltd accompanies the fire protection installation from consultation to the assembly and far beyond. CALANBAU imposes high requirements on the surface of the used pipes. Two blasting installations permit the automatic treatment of pipes with different diameters.

In many companies, fire protection prevention is a neglected theme. Only after the first fire, is it asked why it was not better prepared against the fire. Fire protection installation secures against risks that can menace the existence. CALANBAU offers complete solutions from conventional sprinkler installation to special extinguisher installations: Sprinkler, sprayed water installations, foam extinguisher installations, Argon-, CO2-installation, installation of fire alarms and hydrants.
 
Operating procedure

The pipes arrive disordered that means with different diameters (33 - 219 mm) by bundle from the production unit to the blasting installation. In the division blasting technology, it was decided to choose AGTOS Ltd from 48282 Emsdetten. The company is known for its innovative solutions in the sector of surface technology. This includes economical manufacturing concepts for the involvement of surface technology in the production.

The pipes are automatically isolated and independently from their diameter put on the roller conveyor through a star scroller. The rollers are placed oblique to the direction of conveying. That is why the pipes are moved to the front with a continuously variable speed (5- 17 m/min.) as well as the Rotation around the own axle. This is important to achieve a homogeny surface in the blasting chamber. Before the entry sluice of the blasting chamber there is a switching threshold that activates an impulse when a pipe passes. Immediately, abrasive is put into the running turbine with high performance. With this starts the blasting process. The pipes are regularly cleaned from the exterior. Therewith it is assured that the turbines receive only the abrasive when a work piece is in the machine. This limits the abrasion in the interior of the machine to a minimal degree. Because of the effect of the abrasive, the blasting chamber produced with wear resistant steel is additionally protected with exchangeable abrasion plaques.

The task for the customer is the complete elimination of the abrasive inside of the pipes. This was achieved through an innovative technology.
After the blasting process, the treated pipe is transported into the exit sluice and automatically raised, until it is in the ideal position in front of the blow out sluice. At this time, the next pipe is already on the blasting process. The end walls of the exit sluice flip up and leave the blasted and blown pipe. It then goes to other blasted pipes on the float.
After the blasting and the blow out process, the pipes are automatically conducted in double lines into the two weld robots.

Blasting technology on high level

The corpus of the blasting machine is manufactured with wear resistant manganese steel and in the dropping area of the turbine it is additionally protected against abrasion with exchangeable plaques of manganese.
Each one of the high performance turbines 3.6, the heart of the machine, have a one disc wheel in front of the double disc wheel which is a big advantage over the existing ones on the market. The distance bolts between the two discs slip in this case. These disturb the abrasive circuit and cause velocity. The performance of these turbines is approximately 20% above the comparable double disc aggregates – with the same energy consumption.
A further reduction of the abrasion susceptible elements was achieved through the use of six throw buckets instead of eight. This saves costs and has a positive effect on the performance of the Aggregate. Örjan Jarehed, the head of production by CALANBAU: „We have from the start put a big importance on the errorless involvement of the surface technology in the operating procedure. We are very satisfied with the transport of the work pieces and the blasting technology.“

The abrasive is conducted into the circuit. It is transported with a screw to the bucket elevator after having been blasted on the work piece through the turbine and been collected in hopper. In this way, the abrasive arrives at the roof of the machine for the treatment. Here an air separation takes place that separates and deviates foreign substances from the abrasive undersized particles. The dust is conducted to the filter system belonging to the installation whereas the cleaned abrasive is moved into the high performance turbine.

Innovative Filter Technology

The filter cartridges are automatically and continuously cleaned. The falling dust from the cartridges is put in a collecting bag through a hopper. The filter installation is equipped with insertion cases so that the cartridge that must be changed can easily be replaced. Thanks to the conical form of the cartridges, better dedusting results and less consumption of compressed air are achieved. Costs of disposal are less since not the whole filter cartridge has to be disposed but only the filter paper (or -polyester).

With this concept, CALANBAU is able to offer high quality fire protection installations. However we are happiest when the products do not come into operation.




Author: Ulf Kapitza, AGTOS GmbH

Calanbau Fire protection installation Ltd
Wenderter Straße 12
31157 Sarstedt, Germany
Tel. +49.5066.808-0, Fax +49.5066.808-999
E-mail: info@calanbau.de, www.calanbau.de


AGTOS Gesellschaft für technische
Oberflächensysteme mbH
Gutenbergstr. 14, 48282 Emsdetten, Germany
Tel. +49.2572.96026-0, Fax –111
E-mail: info@agtos.de, www.agtos.de