Blast Room 101: Things You Should Know About Blast Booth

  • Key components of blast room systems
  • Key considerations and Information required for blast room projects
  • Common blast chamber designs and layout
  • Blast chamber ventilation
  • Abrasive reclamation, cleaning & recycling options
  • Waffle floor pneumatic recovery layout & sizing
  • Blast Equipment Options

By Mathew Lee| Updated: March 7, 2024

Key Components of Blast Room Systems

Like blast cabinets, blast rooms are large enclosures for operators to perform abrasive blasting without any dust emission into the atmosphere. We can think of them as a vast blast cabinet, but the operators are working inside the enclosure instead of outside it.
Let’s go over a typical blast room layout of the blast chamber.

blast room layout

Item number one: Blasting chamber

It consists of the entire physical structure and closing of the whole abrasive blast operations. And it’s typically made of structural steel, cladding, or sandwich panel steel. The blast room usually uses rubber or polyurethane abrasion-resistant liner to protect the steel walls and ceiling and assist with sound dampening.

The blast booth includes other critical elements, such as doors, lighting, ventilation, work handling, et cetera.

To drive the ventilation of a blast chamber, we require a dust collector. It consists of the entire physical structure and closing of the whole abrasive blast operations.

Item number two: Dust collector

To provide such an air flow, besides providing ventilation air flow, the dust collector will also have filtration capabilities to remove dust, find abrasive media and contaminants from the reclaimed air prior defending to the atmosphere. 

Item number three: Abrasive reclaim system

Which transports spend abrasive media after blasting to the abrasive of recycling and cleaning unit.

Item number four: Abrasive recycling and cleaning unit

 So the good reusable abrasive media can be delivered to the blast equipment.

Item number five: blasting Equipment

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Blast Room Size

The blast chamber and enclosure used to house abrasive blasting operations can vary extensively inside based upon application requirements. Most blast rooms are customized and sized according to application requirements for more minor blast room requirements.
There are many ways to modify a shipping container for the blast chamber.

blast rooms

A small blast chamber which size is 3m*3m for a single blast operator

sandblast rooms

An ultra large chamber which size is 40m*40m for multiple operators

airblast rooms

modified standard 20′ or 40′ shipping containers for blast chambers

We have a partial blast chamber layout for the modified shipping container. The blasting chamber only uses. A partial section of the shipping container and the dust collector uses the rest of the shipping container. The whole shipping container provides ventilation to the blast chamber, and the abrasive recycling and cleaning system is housed outside the shipping container. However, its feed hopper is located within the blast chamber. It allows the blast operator to manually shovel the spent abrasive after blasting it into the feed hopper for further recycling and reuse.
We also have a modified shipping container whose entire container is a blast chamber with an abrasive reclamation and ventilation system sitting outside at the rear of the shipping container.

sandblasting room

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Customized Blast Rooms

Because we are building a customized product to suit a particular application, all aspects of the project must be considered to come up with the best design that meets the customers’ requirements and budget constraints and within the physical limitations of the installation site(if any).

Key considerations and Information required for the project would include:

  • Maximum dimensions of the weight of the workpiece
  • Production, the volume needed for the various workpieces
  • Number of blast operators and production shifts
  • An abrasive media type that will use
  • Physical size and limitations of the installation site, if any
  • Availability of existing work handling equipment
  • Availability and scope of compressed air supply
  • Availability and type of electrical supply
  • Integration of blast room system with other new or existing factory equipment (for example, paint room)
  • Customers project budget

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Construction

There are many ways to the blast chamber structure. So long as liners protect the internal surfaces of the blast booth from the abrasive blast stream and the structural integrity is adequate to meet customer expectations. It does not matter what construction method is used.

blast rooms blastking group

We have sandblast rooms modified by standard 20′ or 40′ shipping containers

blast room blastking group

we have blast chambers made by made by profiles frame and sandwich panel with rock wool interlayer.

sand blast room blastking group

we have a chamber structure made by the assembly of standard galvanized steel sheets.

Door options for blast room

There are multiple door options for blast chambers. Some common ones include sliding swings and roller shutter doors. Image one shows a sliding door-style blast chamber where the doors open sideways, similar to a building elevator. Image two shows a dual swing door-style blast chamber where the doors open outwards. Finally, image number three offers a roller-shutter-door type design. On the left side of the image, we can see the blast chamber outside with the door in the rolled-up position.

blast room with roll up door

We have small blast chambers with rolled-up doors from the outside in the rolled-up position.

sand blast room drawings blastking group

We have customized blast chambers with rolled-up doors at both ends of the blasting room.

blast room

We have dual swing door styles sand blast chambers where the doors open outwards.

The roller shutter door layout has the added advantage of being space-saving since there is no need to allocate additional floor area for door movement. Regardless of the type of door used, it usually installs a safety door interlocking mechanism to ensure that it can not start blasting operations unless the blast chamber doors are fully closed.

Key features

This image shows some of the other key features of typical blast chambers.

  • Not all blast chambers will have some ceiling lighting and for larger wide blast chambers, additional side lighting will improve room lumination greatly.
  • For larger blast rooms having more than one access door for operator access out of the blasting rooms are also common. with smaller blast rooms, operators can simply use the main blast chamber doors for access.
  • With full floor abrasive media recovery blast rooms, industrial floor grids are also commonly placed on top of the abrasive media recovery system, so the operator is able to walk and move around the blast room.
  • With a manual sweet recovery blast chamber, no floor grid is used as a smooth blast chamber floor is needed to facilitate abrasive sweeping and recovery for recycling and reuse. 
blast room key features

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  • Most blast rooms’ ventilation systems use a down-draft or cross-draft layout across the length of the blast room. So inlet air ventilation plenum louvers are commonly located on the top or towards the front or entry area of the blast room. A typical placement location for these inlet air louvers is the blast chamber roof, as shown in this photo, or on the doors of the blast chamber.
  • The ventilation dust collector will then be ducted into the opposite end of the room to create the down-draft/cross-draft laminar airflow necessary to give good visibility to the blast operator.
  • In the case of BlastKing’s blast booths, the waffle pneumatic recovery system uses the two and one full to concentrate a strategy for blast chamber ventilation and media recovery. In this situation. The inlet air louvers are spread out evenly across the top of a blast chamber ceiling instead of being located at the front or entry of the blast chamber.

 

Work handling

Work handling systems can range from sophisticated mechanized trolleys and turntables with articulated work platforms to basic manual fixed platform track and trolley handling, depending on the client’s requirements and project budget.

blast room with articulated work platforms
sandblast rooms with trolley
sand blast room with hoist systems
  • Image number one is a typical full-blown work handling solution with articulated work platforms for the operators to traverse the blast chamber’s length, height, and width. Tracks are located in the center of the blasting chamber for the workpieces to get in or out.
  • Image two shows an alternate blast room layout to suit inline production operations by having two sets of doors on each end of the blast chamber. The multiple trolleys can minimize abrasive blasting downtime. The extra trolley containing the unblasted workpiece can immediately be moved into the blasting chamber for immediate blasting after the blasted workpiece on the other trolley is moved out from the opposite end of the blast chamber.
  • Finally, image number three is also a hoist-crane workpiece handling solution, in which workpieces can be up & down during blast processing to blast processing the bottom.

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sandblast cabinet

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Blast Chamber Ventilation

  • The blast chamber must have an excellent ventilation system for an operator to have adequate visibility during blasting. The blast chamber should be equipped with a dust collector at the opposite end of the inlet air plenum to provide the required air crossflow to remove airborne dust and fine abrasive media.
  • To get the best performance of the dust collecting system, we need to calculate the cross-sectional area of the blast chamber in square feet and then multiply the flow factor by 30 for metallic abrasive or 45 for nonmetallic abrasive. Then we will get the required dust collector flow rate in CFM. And add 10% to the required flow rate if more than one blast operator uses the blast room system.
  • Due to dust overloading from the high abrasive breakdown rates, The blast room system can never use the single-use expendable abrasive media, such as copper slag, crushed glass, or silica sand,
  • BlastKing standard dust collector sizes include 3000 CFM, 4500 CFM, 5000 CFM, 5500 CFM, 7500 CFM, 9000 CFM, 10000 CFM, 12000 CFM, 15000 CFM, 20000 CFM, and 30000 CFM. If an application is between standard sizes, it’s better to upsize to the next available size for improved operator visibility.
blast room ventilation 3
blast room ventilation 2
blast room ventilation 1

Like blast chambers, ventilation can also customize dust collectors to suit applications that cannot use standard dust collector designs. For example, let’s take the size of a 5m×5m×10m blast room, a sample that will operate with glass beads (nonmetallic abrasives). The cross-sectional area will be 5m×5m equaling 25 square meters or 269 square feet. Multiplying this by 45 gives us 12109 CFM so that we can select the standard 12000 CFM unit as the ventilation dust collector for this chamber size.

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wheelblast machine

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Abrasive Recovery

Broadly speaking, there are three ways for abrasive media to be recovered for recycling and reuse:

  • Manual recovery
  • Mechanical recovery
  • Pneumatic recovery

Manual recovery

The manual recovery system is the most economical method for low-production volume blast room applications. The feed hopper of the abrasive media recycling system is placed inside the blast chamber while the rest of the unit is placed outside.
To make manual abrasive recovery more ergonomically friendly for the blast operator. The abrasive media recycling system can be mounted in a pit such that the top of the feed hopper sits flush or slightly below the level of the blast room floor. By so doing, no shoveling is required of the operator, and the stent abrasive media and dust can be swept or compressed air blown directly into the feed hopper.

pit abrasive recovery system

With a pit-mounted recovery system. Must take extra care to ensure that the pit stays dry with no possibility of water entry or adequate drainage provisions to drainage provisions to keep the hole dry. Any water ingress into the abrasive reclamation system will cause equipment failure and loss of production time.

Mechanically abrasive reclamation systems

Most mechanical recovery systems are extensions of the manual abrasive reclamation system, provide a means to reduce the effort of operators sweeping required, and mechanically convey the spent abrasive media into the feed hopper or directly into the boot of the bucket elevator.

abrasive recovery system
partical abrasive recovery floor
full scraper floor abrasive recovery system

We have a multiple screw conveyor layout with individual screw conveyors laid along the length of the blast chamber feeding into a central screw conveyor, which feeds directly into the boot of the bucket elevator.

We have multiple rows of individual scraper conveyors laid along the length of the blast chamber floor, feeding into a central scraper conveyor, which then feeds directly into the boot of the bucket elevator.

While both illustrations show full-floor mechanical recovery with multiple feeds into the central screw conveyor or scraper conveyor, the individual screw conveyor or scraper conveyors can be eliminated or reduced for a partial floor recovery system. For a partial floor recovery system, the blast operator needs to sweep the spent abrasive from the floor of the blast chamber to the nearest conveyor.

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