Abrasive blast rooms are a productive method to prepare large components while providing a safe environment for the operators and co-workers. Blast rooms will be designed to fit the application, part size, production rates, type of abrasives to be used, and work flow of the finished parts.
Typical applications for blast rooms are removing coating or preparing surfaces for painting and powder coating. Most secondary applications require a specific profile or etch to obtain proper adhesion for the coating.
The blast room has five basic components: the blast enclosure, the dust collector, the pressure air media blast delivery, media recovery system, and operator safety equipment.
The blast room enclosure will be designed to contain the dust from the abrasive blast process. It also provides proper ventilation and lighting for the operators to perform efficiently. There are a number of choices on the actual room depending on the blast process.
The first option is a pre-engineered blast room. Like a blast cabinet, the pre-engineered rooms are offered in sizes that will fit most small component blasting operations.
The pre-assembled rooms are not much larger, but offer a unique option of full floor media recovery. This is a great choice for high production rates on smaller parts, because the operators do not have to stop blasting to sweep up spent media.
Engineered rooms are specifically designed for larger components like tanks, equipment, or vehicles. There are some options available to tailor the room for specific applications, with items such as: crane slots, cart tracks, pipe/tube slots, and drive-through with doors on each end of the room
The size of the abrasive blast room will determine the capacity of the dust collector to adequately clear the room of airborne dust and debris. Proper ventilation is an important factor in providing a safe, productive, and efficient work environment.
The profile specification will help determine the proper media. The type of media used to blast will determine the recovery system for the blast room. Lightweight media can use a pneumatic recovery system to recover the media. The spent media and debris is pulled in the cyclone reclaimer which will separate dust and debris into the dust collector while reusable media is returned to the media hopper. Heavier metallic media will require mechanical recovery, including screw conveyors, bucket elevators, and air wash systems. The recovery systems can range from simple sweep in models to partial floor recovery or full floor recovery.
Abrasive blast delivery uses air pressure blast systems. The pressure blast pots will be positioned under the media hoppers on either the pneumatic or mechanical recovery system so they can easily be reloaded with blast media. Smaller rooms will be equipped with one pot for one operator. As the room, and the process, expands, there are options for larger pots and multiple operators to achieve greater output and reduce down time.
For operator safety equipment, please see blasting safety.