Abrasive Blasting Ventilation Design and Dust Control

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Dust Control. Saves Lives

Abrasive Blasting generates large volumes of dust that can be toxic and small enough to be inhaled into lungs and thus can be hazardous to workers. Sandblasting operations are therefore undertaken in custom designed blast rooms. These blast rooms can be placed under negative pressure by a dust collection system to remove unsafe contaminants from the air, keeping the workplace safe for all operators.

Airborne dust particles also contaminate our sensitive ecosystems, in particular our rivers, dams and waterways negatively impacting on water quality. Hazardous dust and fumes that escape into the atmosphere can reduce crops in agriculture by burying seeds, cause loss of plant tissue and reduce photosynthetic activity and increase soil erosion. In addition airborne dust and fumes can also play a role in the transmission of diseases.

Health & Safety Regulations

Dust control regulations for the Abrasive Blasting Industry are becoming increasingly stringent due to the rising number of silicosis cases being reported across the globe. Silicosis is an incurable lung disease caused by exposure to harmful silica dust which is found in almost every type of natural rock, sand, clay and gravel.

The Work Health and Safety (WHS) Regulation includes more specific requirements to manage the risks of hazardous chemicals, airborne contaminants and plant, as well as other hazards associated with abrasive blasting activities like noise and manual tasks.

Why Grydale? Experts in Dust Control.

Our team has over 20 years experience designing dust control solutions and are able to advise on which units would be most suitable for your application and site conditions. Our onsite team can also determine the optimum set up of equipment to ensure dust and fumes are managed effectively.

Grydale has a range of fixed and mobile dust collectors which can eliminate dust at the source and protect your workers from potential deadly diseases and accidents in the workplace due to poor visibility.

Custom Design for Abrasive Blasting

In some instances blast rooms and pneumatic recovery systems are required to contain the dust and fumes and prevent them becoming airborne. Our engineering team will design a ventilation and dust control solution specific to your requirements and site conditions and in accordance with current workplace health and safety regulations.

Air Intake

JMS M-Series dust collectors offer flexible intake options which means they can be used for general ventilation and dust extraction at the source. Single air intakes are best suited for large dust loads whilst dual and multiple air intakes can be used to extract dust from multiple sources simultaneously. Flexible couplings allow the dust collector inlet to connect effectively to ducting on uneven surfaces.

Reverse Pulse Cleaning System

JMS M-Series dust collectors have either a plant air connection or an on-board air compressor and receiver tank which feed the pneumatic system to provide reverse pulse filter cleaning. The pneumatic system’s primary function is to clean out the filters during operation to prevent dust build up on the filters.
Pressure and frequency of pulse cleaning is adjustable and helps reduce the number of filter changes required.

Drop-Out Box

Our patented drop out box takes heavy dust particles and shotcrete fibres out of the air stream and discharges them through the augers and rotary valves before they hit the filters. This exclusive patented design extends filter life and allows the units to handle extreme dust loading.

AB 30000 dust collector for abrasive blasting

AB 30000 Mobile Dust Collector

Sandblasting

Abrasive Blasting generates large quantities of inhalable dust

Pneumatic Recovery System

Pneumatic Recovery System attached to Blast Room

Sizing a Dust Collector for Abrasive Blasting Application

A combination of airflow, air velocity, pressure, resistance and air-to-cloth ratios determines the appropriate size and ducting configuration. Incorrect sizing can result in high emissions, lowered productivity, reduced filter life and an unsafe working environment.

Airflow diagram

Airflow.

Generally the larger the space where extraction is required or the greater the number of pic-up points the great the airflow required. Variable Speed Drives (VSD) or Variable Frequency Drives (VFD) can be used to adjust the airflow when there are fluctuating site conditions. This can help to reduce power consumption.

Air Velocity Diagram

Air Velocity.

For dust to travel suspended in air it must travel at or above the minimum conveying velocity for that product. There are also risks such as explosion, toxicity and abrasion associated with certain dust types to be considered.

Air-to-cloth ration diagram

Air-to-Cloth Ratio.

For dust collectors to capture dust from the airstream, they must have a sufficient number of filters. Maintaining an adequate air-to-cloth ration enables the dust collector to operate at peak efficiency. Dust types and the amount of dust per cubic meter are all determining factors.

Pressure and Resistance.

The fan used in the dust collector must supply enough suction to overcome duct and fixed pressure losses from the collection points through the dust collector and filters before exhausting clean air out of the system.

Coastal PowderCoating Case Study

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We try to respond to requests on the same business day, however if your enquiry is urgent please call our team on +61 1300 929 349. Our office hours are between 07:00 and 17:00 (AEST) Monday to Friday.