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Explosion-Proof Dust Removal Equipment

explosionproof dustremoval equipment

Explosion-Proof Dust Removal Equipment

Dust explosions are a real threat at many plants and must be controlled to keep employees safe and minimize plant damage. Explosion-proof vacuums are used in a variety of applications to remove combustible dust from heavy equipment and facility floors.

The first step in mitigating this risk is determining whether your dust is combustible through an actual sample test by a lab. After that, you can select mitigation equipment.

Venturi Scrubbers

Venturi scrubbers remove contaminants and dusts from process gas streams. They also reclaim the pollutants as fuels or process raw materials, saving industry money. They are a preferred design for applications where high collection efficiency of between 70 and 99% is required for particles smaller than 1 m aerodynamic diameter.

The polluted gas stream and wash liquid collide tangentially at the venturi throat. The resulting jets of washer fluid, typically water, are atomized by the high gas velocity and create an enormous number of tiny droplets for the dust particles to impact on and collect in. explosion-proof dustremoval equipment The entrained liquid droplets must be separated from the scrubber outlet stream by mist eliminators, mesh pads or cyclones to prevent excessive liquid carryover into the gas stream, which can reduce absorption efficiency.

Venturi scrubbing systems require very high levels of wash fluid injection rates and nozzle pressures to ensure adequate gas-liquid contact. They are also subject to severe abrasion problems in the high-velocity areas of the nozzle and throat sections. The scrubbing system should therefore be designed of wear-resistant materials, and the recirculation pump that injects the wash fluid must be constructed of an easily maintainable, leak-proof design to minimize maintenance costs.

The dusty exhaust gas enters the flanged scrubber inlet connection via ductwork from the source of emissions. Tangential feed pipes introduce the scrubbing solution supplied by a recycle pump. These feed pipes are straight open pipes that do not contain spray nozzles. The dust/solution mixture discharges out the separator bottom drain and clean gas exits through the top of the separator.

Air Classifiers

Air Classifiers are a kind of industrial machine that separates materials by size, shape and density. This process involves forces, including air drag, gravity and centrifugal force, which sort heavier particles from lighter ones and coarse material from finer particles.

They can be used for many different kinds of applications, including dedusting a powder coating; separating minerals like limestone, ores, marble, granite, talc, dolomite or barite; and even classifying toners and other industrial fillers. Using an air classifier helps reduce the need for water in settling ponds, which can save money and improve efficiency in many ways.

These devices can be incorporated into other systems, such as a grinding mill and pneumatic conveying system. In a closed circuit with a mill, they can maximize the mill’s capacity and energy output by serving as its primary sizing device instead of a separator. They are also ideal for de-dusting stone sand that has higher surface moisture (3.5 to four percent) because the moistened particles stick together and can clog up other equipment.

They are built with a hinged housing that allows easy access and cleaning, which makes them a cost-effective option for companies looking to remove dust at the source, rather than in a downstream system that can be prone to blockages. They can also be integrated with a high-efficiency particle collector to help eliminate the need for water or a settling pond and achieve the highest possible throughput rates.

Immersion Separators

For a collision repair shop dealing with aluminum parts, the combustible metal dust that accumulates can pose serious explosion hazards. That’s why NRTL-certified equipment like Ruwac’s “Wet Mix” immersion separator is necessary to help safely collect and neutralize this danger.

The aluminum dust particles entering the vacuum are instantly mixed in a turbulent liquid bath, neutralizing them and making them inert before they leave the filtration system of the separator. The separator is made from stainless steel and can be used to handle combustible dust in Group E hazardous locations.

It’s possible to integrate the immersion separator into one of Tiger-Vac’s explosion-proof vacuum cleaners or dust ignition proof industrial vacs for NFPA 484 compliance. However, it’s also available as standalone equipment that can be installed on a variety of different vacuums and industrial vacs for combustible dust and explosion/dust ignition protection.

The combustible dust is captured by the low-sparking, stainless steel filter and is rendered inert in an oil or water bath within the unit. The resulting clean air is then released into the workspace, keeping the workers safe and avoiding any potential explosions caused by combustible dust. These units are perfect for a range of industries where combustible dust is common. They’re easy to operate and are great for ensuring good housekeeping standards as required by OSHA.

HEPA Filters

In addition to dust, a HEPA filter can also trap other particle pollutants such as mold spores and pollen. It can also capture microorganisms such as bacteria and some viruses that are 0.3 mm in size. These microscopic particles are very dangerous, especially for people with asthma or other respiratory conditions.

A HEPA filter is usually made from a PTFE or glass fiber material that’s arranged as a mat of randomly positioned strands. When air flows through the filter, the explosion-proof dustremoval equipment strands separate the smaller particulates from the larger ones. When the small particles reach the strands, they’re trapped by one of three mechanisms:

As the dust settles on the filter surface, it becomes compressed until it reaches a specific pressure drop. Depending on the efficiency of the filter, the pressure drop will increase with the amount of deposited dust. Unlike some other filters, the effectiveness of HEPA filters increases as the amount of deposited dust increases.

The Tiger-Vac CD Stainless portable dust collector is an explosion-proof ductless dust collector that’s ideal for food production, pharmaceuticals, clean rooms and other applications that require pristine working environments. The air-operated industrial vacuum meets NFPA 654 standards and comes standard with 2 or 3 stage filtration that includes a pre-filter, second stage MERV 14 95% efficient ASHRAE fiberglass box filter and a true HEPA filter.

Explosion-Proof DustRemoval Equipment

explosionproof dustremoval equipment

Explosion-Proof DustRemoval Equipment

Explosion-proof dustremoval equipment protects facilities that handle chemicals or combustible materials. This equipment includes explosion-proof vacuum systems used in industrial settings such as pharmaceutical or chemical plants, manufacturing, and oil refineries.

A specialized dust collector is typically installed in inlet or outlet ducting. This system reacts within milliseconds of detecting an explosion to close valves and spray a chemical agent into the ducting to suppress the explosion.


Venting is one of the most common methods of protecting process equipment from combustible dust explosions. This allows the fireball and associated pressure to be safely ejected to a safe area (Holbrow, 2000). It explosion-proof dustremoval equipment is important that the impact of the ejected fireball is considered when selecting a suitable vent type and size. The explosion vent design should also be compatible with the ducting system to which it is connected.

Explosion vents are available in both rectangular and round designs to suit a wide range of applications. They are designed to be mounted within a safety frame and can be rated for both atmospheric and vacuum service conditions. The round vents have a one or four petal relief opening with a domed construction that is designed to resist vacuum conditions.

In addition to venting, explosion isolation must be a consideration in any explosion protection strategy. This reduces the risk of flame propagation along ducting to connected process equipment.


Latches are often the first point of failure in your explosion-proof dust collection equipment. They require alignment of multiple components and screw installation under spring pressure. This can result in tired hands, lost components and multiple attempts to get the latch assembled. Our patented slotted hook latch allows for latch assembly WITHOUT the need for spring tension. This greatly reduces the amount of time needed for assembly, provides easier use and aids in OSHA compliance.

The latch bolt is seated in a notch bearing 24 in the forward end of the member 23 and in the rearward face of a keeper seated at the shoulder 19 when the door is closed. The latch bolt is also seated in a notch bearing 28 in the forward end of the handle for operation by the handle.

The latch actuator has end portions 21 and 28 of channel section each including integral webs 29 and 30, the mid-portion of the webs being cut away to provide a cross channel 32 for facilitating movement of the actuator relative to the base plate. When the latch is in the operating position, the pins 11 engage slots 10 in the first drive gear wheel. As the manually operated lever handle is grasped and moved to the disengaging position, its forward arm 29 engages the outer arm 30 of the latch bolt and the latter swivels outwardly from engagement with the keeper.

Immersion Separators

Some explosion-proof vacuums feature an immersion separator, which is used to render combustible metal explosion-proof dustremoval equipment dusts inert inside the machine. This helps keep work environments safe while providing a powerful tool for cleaning hazardous materials and maintaining good housekeeping standards. This technology is typically found on specialized combustible metal dust vacuums, such as the Ruwac USA NA35 Series.

These combustible dust vacuums are CSA-certified for use in Class I, Division 1, Group D and Class II, Groups E*, F & G locations. They also have PullClean filter cleaning technology and downstream HEPA filtration. Variants are available to handle both wet and dry materials, too. These vacuums are perfect for applications such as welding, cutting, grinding and sanding, metal polishing, thermal spraying and powder coating.

The metal drums on these units serve as containment containers that ensure explosive or combustible dust is confined while it’s being recovered by the vacuum. The explosion-proof vacuums are usually made of materials that can withstand an internal pressure explosion, such as stainless steel or reinforced fiberglass. They also have anti-sparking components to minimize the risk of fire due to static electricity.

Explosion-proof vacuums are powered by compressed air and do not use electrical motors that can generate static electricity or sparks. They are equipped with multiple sets of filters to reduce the amount of dust that reaches the motor, and their components and accessories have been joined together and grounded to safely discharge any built-up static and prevent sparks and explosion threats.


Almost all manufacturing and processing operations generate dust, and many of these particles are combustible or explosive. Using the right kind of explosion-proof dust removal equipment eliminates these hazards and keeps workers safe, while also improving production quality and reducing maintenance needs.

Combustible dust fires are a major cause of industrial accidents that can severely injure workers and damage equipment. These fires are usually caused by ignition sources like sparks from cutting and grinding equipment or embers from welding activities. It is essential to find the best explosion protection systems and locate them around critical operations like these.

For example, the Monroe Dual Throat Venturi Scrubber uses water to reduce a combustible dust’s explosion potential and transfer it into the water stream. The water contact, baffling, and mist elimination stages in the scrubber process help remove the particle from the air. The water-scrubber system then pumps the clean, breathable air back into the workplace. This type of explosion-proof dust extraction system is an excellent option for a wide range of industrial applications, such as metal fabrication, welding and cutting, woodworking, chemical pharmaceuticals, and more.

In addition to the aforementioned methods, industrial explosion-proof vacuums can be used for other types of hazard mitigation, such as flammable liquids and spills, or removing sanding and grinding debris. They are also ideal for a wide range of cleaning tasks in food production, labs, and pharmaceuticals, or other clean areas. The Tiger-Vac CD-600EX Stainless portable explosion-proof vacuum meets OSHA and 3rd party NFPA standards for Division 1 Hazardous Locations, and can handle large volumes of combustible dust with an effective capture velocity of over 1200 cfm. It features a spark-trap, manual filter pulse cleaning, articulating arm, and locking casters for easy movement.