Off-line Shotblasting Machines for Hot Water Boilers
- For medium sized boiler manufacturers
- Production capacity of 35 boilers per hour
- No overhead conveyor required
- Fully PLC controlled
- Robust construction
- Manual handling for boilers
- Media recovery system included
Hot Water Boiler Shot Blasting Machines
In the last years Straaltechniek International, in combination with some project partners who are all world leaders in their specific field, delivered the surface preparation machines for several powder enamelling lines in Europe. The principle of powder enamelling is similar to powder coating, although the temperature of the firing process for enamelling is significantly different from powder enamelling (up to 850°C instead of 180°C to 220°C).
The lines work in 3 stages:
- Surface preparation of internal surfaces
- Powder enamelling of internal surfaces
- Firing of the powder enamel in a furnace
The 3 machines, suitable for the above described processes, are connected with each other by a hanger conveying system, which transports the boilers through the machines.
Using a powder enamelling process with mechanical surface preparation gives the following benefits:
- No use of chemical pickling as surface preparation, which is environmentally unfriendly
- No use of wet enamelling process, which is also environmentally unfriendly
- Perfect resistance against the aggressive hot water (100°C) to be stored inside the boilers
The boilers are entered through a socket in the bottom (Ø30- Ø100 mm) with a rotating lance, which will perform the surface preparation on the inside of the boilers. Angular steel grit is used to achieve the required cleanness and roughness of the internal surfaces, to assure a proper adhesion of the powder enamel to the shot blasted surface. After surface preparation the boilers are transported to the powder enamelling machine, where the powder will be applied with the same principle as for the shot blasting process and there after, the boilers will be fired in a furnace and after this firing the boilers are ready to be assembled.
Machines have been supplied in online execution (for high production capacities) and off-line execution (for regular production capacity). Machines with a maximum production capacity of 240 boilers per hour have been installed and are producing 350 days a year, 24 hours per day.