In the external blasting process the pipe surface is blasted inside a blast cabin. This with the goal to remove rust, mill-scale and contaminations in order to create a correct cleanness and surface roughness profile for further treatment.
Advantages:
Flat/shallow floor erection reducing investment in deep pits
Rigid manganese steel blast cabin
No pipe support wheels inside blast cabin
High power density/capacity available starting at small diameters
Double pipe seal system
Several options for process optimization possible
How it Works
The blasting process is executed inside a blast cabin with abrasives. These abrasives can be grit, shot or a mixture in varying sizes and hardness. The abrasives are led from an abrasive bunker to the blast wheels thru abrasive valves, controlling the amount of abrasive. The surface cleaning is than accomplished by high power mechanical blast wheels accelerating abrasives with high impact against the pipe surface.
The blasting system comes with abrasive recycling and cleaning system. Used abrasives are collected in a closed loop system by means of a screw and bucket elevator. During cleaning, dust and debris are separated by airflow from the re-usable abrasives. The dust filter which retracts dust-loaded air from the blasting cabin is also generating the airflow for cleaning of the abrasives. The dust filter is in self-cleaning design by means of air pulsations.
The Full Scope:
Blast cabinet
Abrasive reclaim system
Electrical control system
Dust collecting system
High power blast wheels
