Tag Archives: intrinsic safety

Selecting the Best Vacuums for Powder Coating

Powder coating is the preferred finishing technique for consumer and industrial goods, thanks to its durability, economy and quality.

However, the powder itself may present serious health and safety risks when stored, conveyed and applied to products. Under the right conditions, one such risk is the high possibility of combustible dust explosions. An additional risk associated with improper handling of powder dust includes inhalation of particles by workers. It is crucial to ensure that proper housekeeping procedures are put in place and followed on a regular basis to mitigate these risks.

Due to recent NFPA and OSHA guidelines requiring facilities to perform a comprehensive dust hazard analysis and develop a plan to deal with these risks, manufacturers and factory owners now need specialized tools to meet regulations and minimize these hazards.

HafcoVac’s certified, explosion-proof industrial vacuums present an intrinsically safe solution for powder coating clean up. They offer excellent suction regardless of the dust’s location — whether the paint particles are on overhead beams, machinery, walls or floors.

In this article, we will learn more about powder coating, the potential risks that come with it and how we can help prevent them with Certified HafcoVac vacuums.

What Is Powder Coating?

Powder coating is one of the most in-demand paint application techniques for manufacturers of industrial and consumer appliances. In fact, the appliance industry acquires the largest share of the powder coating market, amounting to two-fifths of all industrial powder coated parts.

The powder coating process involves spraying paint in the form of powder on top of binders and pigments that are sprayed directly onto the surface. In contrast, liquid paint has binders and pigments present in solvent. The inclusion of binders and pigments in liquid paint results in longer drying times, which can also vary depending on atmospheric conditions. 

Once the powder coating spraying is completed, the item must be baked to a certain temperature for a set amount of time. Called curing, the duration of this process is different for different types of powder. Next, the powder is heated to a high temperature in order for the powder to melt. Once melted, the object is cooled for a hard and durable finish. 

Several types of materials including plastics, metals, medium-density fiberboard (MDF) and glass can be powder coated. Similarly, many types of textures and finishes that are not possible with liquid coating methods can be achieved with powder paint.

Here are some advantages of powder coating:

  • More durable compared to liquid coating
  • Better and thicker finish
  • Low environmental impact
  • Less waste
  • Efficient curing and drying process

Risks Associated With Powder Coating

As mentioned, the biggest risks related to powder coating are fire and dust explosions, followed by dust particle inhalation. 

A dust explosion occurs when there is powder accumulation in different parts of a factory or site. If introduced to a source of ignition, it can result in its rapid combustion.

One possible source of ignition is static electricity. This can build up when a vacuum has no grounding to dissipate the static charge generated by the unidirectional flow of the powder debris through the cleaning hose. 

If this ungrounded hose comes in contact with a grounded object, the consequence can be a deadly explosion. That’s why OSHA and the NFPA 654 standard recommend your vacuum: “control static electricity, including bonding of equipment to ground.” 

The rapid combustion of powder coating dust is known to have caused several fires that have resulted in serious damage to the factory and led to pricey shutdowns. As a matter of fact, in 2016 alone, a total of 22 workers were injured and three casualties were recorded due to fire and dust explosions in the U.S. and Canada, combined.

Considering the extent of damage that combustible dust can cause, it is important to use vacuums specially designed to eliminate the risk.

Why Vacuums Are Necessary

With powder coating, the inclusion of an explosion-proof vacuum that can safeguard both workers and the workplace by reducing the possibility of a dust explosion is an essential part of any housekeeping procedure.

As such, it’s important to select a vacuum that is durable and reliable and can efficiently draw up powder from different surfaces. One key element of a vacuum is its filtration system; a good model can clean up powder efficiently without exhausting fine dust into the air. Look for one that has a HEPA filter. 

HEPA filters are 99.8% effective at keeping fine dust particles from entering the air. That results in cleaner air and a cleaner workplace, reducing the explosion risk. HEPA filters are the ideal choice for vacuuming fine dust. 

Many people opt for standard vacuums or Shop-Vacs to pick up powder without realizing that they have limited filtration capacity and motor quality. As such, they do more harm than good and need to be replaced multiple times a year. Some even produce a static charge that could result in the combustion of the dust. Instead, look for one that is fully grounded and bonded to ensure static charges can’t become an ignition source. 

Benefits of Selecting the Right Vacuum

Here are some benefits of selecting a certified, intrinsically safe vacuum:

  • Filtration system with HEPA filters that is 99.8% effective at keeping fine dust particles from entering the air.
  • Properly grounded and bonded to eliminate the possibility of static shock.
  • Virtually eliminates the chance of explosion by trapping combustible dust.

HafcoVac’s Compressed Air Powered Vacuums

Our vacuums perform proficiently in environments where compressed air is available and use of electric equipment is less desirable due to the combustible dust hazard.

HafcoVac vacuums are multipurpose and can meet the cleaning needs of multiple types of industries. They are certified explosion-proof and intrinsically safe in order to clean and extract combustible dust, and other dry and wet materials, from industrial facilities without letting particles escape into the air.

When fitted with our optional S’Hush exhaust silencer, HafcoVac vacuums are silent enough to be used without ear protection, as required by OSHA noise regulations. And with our optional Jack tool holder, hoses are kept neat and off the ground, removing a potential tripping hazard and helping comply with OSHA walking-working surface regulations.

They can be used at the ground level, or they can be used from above in order to clean spraying booths easier.

Plus, our high-quality HEPA filters are long-lasting, large capacity, replaceable filters that come with a washable filter bag to further prolong the filter life, so you don’t have to replace them as often while still keeping your facility safe. Instead of using 4–5 Shop-Vacs a year, use just one HEPA filter. 

HafcoVac Certified Vacuumsc

This vacuum uses compressed air that is already available in your powder coating facility and does not require any external power source. Our vacuums provide five times more suction than a typical Shop-Vac, delivering up to 250 inches of water lift, no matter if you are cleaning from above or on the ground level. 

Our vacuums are electrically bonded and grounded, ensuring full static dissipation, and have no moving parts to wear out over time, backed by our lifetime warranty. 

Anti-Static - Explosion-Proof

Overall, HafcoVac’s compressed air powered vacuums are made for maximum efficiency, using a minimum amount of air to produce the maximum amount of suction power. They are designed to be durable and come with a lifetime warranty from the manufacturer. You can click here to configure our vacuum to your specifications and have it shipped to your door the same day. There’s no need to go through a middle man to get the vacuum your facility needs to be OSHA Housekeeping compliant.

  • These heavy-duty vacuums are portable and can be used in various industrial spaces. They come with two drum sizes: the 30-gallon model is better for smaller jobs while the larger 55-gallon is for bigger cleanups.
  • Our vacuums are NRTL tested and ATEX certified and comply with OSHA and NFPA guidelines.

Want to learn more about our air-powered vacuums? Let’s talk! Click here to contact us or give us a call at 1–877–820–0050.

Combustible Dust: Understanding How To Prevent Industrial Fire Hazards

Many manufacturing and mining industries create large amounts of Combustible Dust that have the potential of becoming highly explosive and causing fatalities and millions of dollars in damage.

More than 450 accidents involving combustible dust have killed nearly 130 workers and injured another 800-plus since 1980, according to a Center for Public Integrity analysis of data compiled by the federal Occupational Safety and Health Administration and the U.S. Chemical Safety Board. These fires and explosions have been caused by a variety of dust sources including sugar, nylon fiber, coal, iron, plastic and wood. Most in the manufacturing industry are aware of some of the dangers and have read or seen reports of these explosions in the news.

An explosion ripped through the New Cumberland A.L. Solutions titanium plant in West Virginia on December 9, 2010, fatally injuring three workers. The plant workers were processing titanium powder at the time of the explosion. The AL Solutions incident is one of nine serious combustible dust incidents investigated by the CSB since 2003, including the Imperial Sugar disaster near Savannah, Georgia, in 2008 as well as three combustible dust incidents over a six month period in 2011 at the Hoeganaes facility located in Gallatin, TN. These nine explosions and fires caused a total of 36 deaths and 128 injuries.

Dust and other debris will always be present in the manufacturing process. Since dust is inevitable in the process, manufacturing facilities must take the proper measures to understand the risks, learn as much as possible about the threat and take solid measures to prevent potential hazards and be prepared should an incident take place.

What is Combustible Dust?

The technical definitions for combustible dust will differ depending on the source that you reference. The Occupational Safety and Health Administration (OSHA) in the United States defines combustible dust as “a solid material composed of distinct particles or pieces, regardless of size, shape, or chemical composition, which presents a fire or deflagration hazard when suspended in air or some other oxidizing medium over a range of concentrations”. In Canada, one example is Alberta’s Occupational Health and Safety Code which defines combustible dust as “a dust that can create an explosive atmosphere when it is suspended in the air in ignitable concentrations”.

What are examples of materials that can be a combustible dust hazard?

Believe it or not the Occupational Safety and Health Administration (OSHA) lists over 120 materials as combustible dust makers. See the chart below for a full list:

What Industries Are at Risk for Combustible Dust?

OSHA notes some of the industries at risk include:

  • Agriculture
  • Food
  • Pharmaceutical
  • Pesticide
  • Rubber
  • Plastic
  • Woodworking
  • Textiles
  • Chemical
  • Recycling
  • Coal fired Power Plants

Causes of a Combustible Dust Explosion

There are three elements needed for a dust fire to
occur and is referred to as the “Fire Triangle”. They are:

  • Combustible dust (i.e. the fuel)
  • Oxygen
  • Heat source


There are also two additional elements needed to cause a combustible dust explosion, often called the “Dust Explosion Pentagon”

  • Dispersion of dust particle in sufficient quantity
  • Confinement of the dust cloud


Secondary Explosions

After the initial combustible dust explosion, there is often a secondary explosion caused. The second explosion is caused by dust that is shaken loose from the primary explosion which also ignites. The secondary explosion may be actually larger and more severe than the initial explosion.

Conditions Needed for a Dust Explosion to Occur

The simple recipe for a dust explosion to happen is for combustible dust particles to be suspended in air and include an ignition source. In reality, several other conditions generally need to be present

  • The combustible dust must release enough heat to sustain the fire.
  • The dust must be suspended in air.
  • The dust must have a particle size large enough to spread the flame.
  • The concentration of the dust suspension must be within the explosive range.
  • An ignition source must be in contact with the suspended dust.
  • Adequate oxygen must be present to support and sustain combustion

Dust Hazard Assessment for Your Facility

Plants should carefully look at the following areas to determine the potential for dust explosions:

  • Materials
  • Processes
  • Open Areas of dust
  • Hidden Areas of dust
  • Dust dispersion sources
  • Ignition sources

Preventative Measures

  • Develop a housekeeping plan
  • Use only approved vacuum cleaners for dust collection
  • Find and eliminate hidden areas where dust accumulates
  • If possible, avoid or minimize horizontal surface where dust may accumulate
  • Use cleaning methods that do not generate dust clouds
  • Use proper electrical and ventilation systems


  • Develop and implement a combustible dust inspection and control program including when inspections will take place and specific actions to control dust.
  • Develop a hot work permit system for activities such as welding and cutting.
  • Develop an ignition control program to eliminate or reduce sources of ignition. Keep ignition sources away from dusty areas or use suitable controls.
  • Educate and train employees regarding the hazards of combustible dusts and their role in eliminating the threat of explosions
  • Inspect for dust at regular intervals.
  • Regularly inspect machines, ducts, and ventilation systems for dust.

How to Select an Anti Static Explosion Proof Vacuum Cleaner

HafcoVac explosion proof vacuum cleaners are safe for use as part of a combustible dust control program and are suitable for many flammable and combustible materials. With no motors to arc and no moving parts to create friction or spark, our non-electric explosion proof vacuums are a safe, reliable and cost-effective solution for your business.

HafcoVac explosion proof vacuum cleaners bond all components of the vacuum together, ensuring no part is left isolated from its path to ground. When used in conjunction How to Select an Anti Static Explosion Proof Vacuum Cleaner with our MSHA approved static conductive hose, a HafcoVac explosion proof vacuum is an economical alternative to other products which often sell for many times the cost.

With performance uncompromised by explosion-proof vacuum safeguards, an upgrade to an explosion-proof vacuum cleaner will perform with the same power HafcoVac is known for. Best of all, you don’t have to sacrifice your budget to protect your business and employees.

If you are unsure if dust ignition proof vacuum equipment is necessary for your application or facility, a HafcoVac representative will gladly provide a thorough application analysis to ensure appropriate product selection.

Intrinsic Safety

HafcoVac explosion-proof industrial vacuums are suitable for use in Class I, Class II, and Class III environments, Division 1 and 2. Our explosion-proof pneumatic vacuums:

  • contains no moving parts, eliminating the possibility of ignition from mechanical friction or contact.
  • uses no electricity, eliminating sparks from motor arcing, shorts, switches, etc.
  • are fully grounded when an explosion-proof vacuum unit configuration is ordered, ensuring dangerous static electricity will not accumulate.

Intrinsic Safety is a protection technique for equipment operating in explosive environments. The principle states that electrical and thermal energy must not build up sufficiently to discharge. With heat or friction risks such as those present when using an electrically operated industrial vacuum safely eliminated, static electricity remains.

The complete grounding of all components, including air supply line, vacuum generating head, collection drum, dolly and vacuum hose ensure that static electricity is continuously dissipated, protecting against dangerous static buildup, which could lead to electrostatic discharge (ESD), posing potentially serious consequences when in the presence of combustible substances. HafcoVac explosion-proof vacuum models factory equipped as an explosion-proof configuration ensures static electricity will not accumulate.

It is critically important that the operator understands the functions of the grounding system. Inspections are suggested prior to each use to ensure the integrity of all grounding wires and points. Care must be taken to not circumvent any grounding safeguards, and should also be exercised to ensure parts such as hoses aren’t used interchangeably with those from non-explosion proof systems.

Are HafcoVac’s Vacuums Certified Explosion Proof?

Stainless Vac

To this date, there are no published certification procedures for air-powered (pneumatic) equipment.

HafcoVac anti-static grounded units (“x” model designation) machines meet the criteria for intrinsically safe operation – no moving parts, non-electric & fully grounded means the unit will not spark and will not generate dangerous amounts of heat.

Additionally, we have designed these machines specifically for use in hazardous locations – building in a double safeguard of conductive static dissipative materials & connections, coupled with complete grounding of all components of the unit.

An independent testing lab has stated that our “X” line can be used in hazardous locations, specifically in Class I, Class II, & Class III environments, divisions 1&2.

HafcoVac explosion proof vacuum cleaners are suitable for a wide range of applications. Safeguard your business from worker injury, OSHA fines or catastrophic incident by protecting your facility with HafcoVac’s safe non-electric anti-static vacuum cleaners.

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OSHA and NFPA Standards HafcoVac Vacuums Help You Comply With

OSHA Standards
NFPA Standards
1910.22: General Requirements: Housekeeping NFPA 61: Standard for the Prevention of Fires and Dust Explosions in Agricultural and Food Processing Facilities NFPA 485: Standard for the Storage, Handling, Processing, and Use of Lithium Metal
1910.38: Emergency Action Plans NFPA 68: Guide for Venting of Deflagrations NFPA 495: Explosive Materials Code
1910.94: Ventilation NFPA 69: Standard on Explosion Prevention Systems NFPA 499: Recommended Practice for the Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas
1910.107: Spray Finishing Using Flammable and Combustible Materials NFPA 70: National Electrical Code® NFPA 505: Fire Safety Standard for Powered Industrial Trucks Including Type Designations, Areas of Use, Conversions, Maintenance, and Operation
1910.146: Permit-Required Confined Spaces (references combustible dust) NFPA 91: Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and Noncombustible Particulate Solids NFPA 560: Standard for the Storage, Handling, and Use of Ethylene Oxide for Sterilization and Fumigat
1910.178: Powered Industrial Trucks NFPA 120: Standard for Fire Prevention and Control in Metal/Nonmetal Mining and Metal Mineral Processing Facilities NFPA 654: Standard for the Prevention of Fire and Dust Explosions from the Manufacturing, Processing, and Handling of Combustible Particulate Solids
1910.269: Electric Power Generation, Transmission and Distribution (coal handling) NFPA 432: Code for the Storage of Organic Peroxide Formulations NFPA 655: Standard for Prevention of Sulfur Fires and Explosions
1910.272: Grain Handling Facilities NFPA 480: Standard for the Storage, Handling, and Processing of Magnesium Solids and Powders NFPA 664: Standard for the Prevention of Fires and Explosions in Wood Processing and Woodworking Facilities
1910.307: Hazardous (classified) Locations (for electric equipment) NFPA 481: Standard for the Production, Processing, Handling, and Storage of Titanium NFPA 1124: Code for the Manufacture, Transportation, Storage, and Retail Sales of Fireworks and Pyrotechnic Articles
1910.1200: Hazard Communication NFPA 482: Standard for the Production, Processing, Handling, and Storage of Zirconium NFPA 1125: Code for the Manufacture of Model Rocket and High Power Rocket Motors
NFPA 484: Standard for Combustible Metals, Metal Powders, and Metal Dusts

HafcoVac is providing information on pertinent OSHA and NFPA standards as a convenience to our customers. Our reference to OSHA, NFPA, MSHA or other governing bodies is not intended to be construed as an endorsement of this, or any specific product, by the respective agency.