Asbestos is a hazardous material commonly found in older buildings across cities such as Buffalo, Rochester, and Syracuse. It’s removal (or abatement) is a complex and potentially dangerous task; when disturbed, asbestos fibers become airborne and can be inhaled, leading to serious health conditions such as lung cancer, mesothelioma, and asbestosis.
To ensure the safety of workers and building occupants, it is essential to use engineering controls during asbestos abatement to minimize exposure to airborne fibers. These controls are critical in reducing the risk of asbestos contamination during the removal process.
Let’s discuss some of the most crucial engineering controls in asbestos abatement.
1. Negative Air Pressure Systems
A negative air pressure system is one of the most important engineering controls in asbestos abatement. It’s designed to prevent asbestos fibers from escaping into surrounding areas during abatement activities. The principle behind negative air pressure is simple: air is drawn into the work area through HEPA (High-Efficiency Particulate Air) filtered exhaust fans, creating a pressure differential that forces air to flow inward rather than outward. This ensures that contaminated air doesn’t leak into clean areas.
The negative pressure system includes several components:
• HEPA filters: These filters capture even the smallest asbestos fibers, preventing them from being released into the environment.
• Exhaust fans: These are strategically placed to draw air from the work area and push it through the HEPA filters.
• Airlocks and sealed entry points: These are used to ensure that any air entering or leaving the work zone is filtered and contained.
By maintaining negative pressure, the risk of asbestos contamination outside the work area is significantly reduced, helping to protect both workers and building occupants.
2. HEPA Vacuum Systems
HEPA vacuum systems are crucial for cleaning up asbestos debris and dust during the abatement process. Unlike regular vacuums, which can release particles back into the air, HEPA vacuums are equipped with filters that trap even the smallest particles. They are equipped to capture 99.97% of particles that are 0.3 microns in size. These units are used to clean surfaces, tools, and other equipment that may come into contact with asbestos fibers.
Using HEPA vacuums is critical for preventing asbestos from becoming airborne, especially during demolition or removal of materials. It is important to use them throughout the project, not just at the end, to ensure that debris and dust are continually controlled and safely removed.
3. Critical Barriers and Decontamination Systems
In asbestos abatement, containment is essential to prevent the spread of asbestos fibers beyond the work area. Critical barriers and containment systems are designed to isolate the work area and minimize the risk of contamination. These barriers are typically made of polyethylene plastic sheeting and are installed to seal off the work zone from surrounding areas. They are often combined with airlocks and decontamination units, where workers can remove contaminated protective gear before exiting the site.
Containment systems help to keep asbestos fibers confined to a specific area, reducing the chances of cross-contamination and limiting exposure to workers, occupants, and the environment. The integrity of these barriers is regularly monitored during the abatement process to ensure that they remain intact.
4. Wet Methods
Using wet methods is another key engineering control in asbestos abatement. Wetting materials containing asbestos helps to minimize the release of airborne fibers by binding them to the material, making them heavier and preventing them from becoming airborne. This is especially important when removing asbestos-containing materials (ACMs) such as insulation or ceiling tiles.
Spraying amended water or a wetting agent onto asbestos materials before removal reduces the chances of fibers becoming airborne. It’s important to ensure that the materials are adequately saturated to maintain control over fiber release. Wet methods are typically used in conjunction with other engineering controls, such as negative air pressure systems and HEPA vacuums, for maximum safety.
5. Third-Party Air Monitoring
Continuous air monitoring is valuable during asbestos abatement to ensure that fiber levels in the air remain below the permissible exposure limit (PEL). During “large” size projects in New York State (more than 160 square feet of material), air sampling is conducted at various points around the containment area to detect any release of asbestos fibers. This monitoring helps contractors assess the effectiveness of their controls and make adjustments if necessary.
How AEG Can Help
By implementing these engineering controls, workers and building occupants can be protected from the harmful effects of asbestos fibers. AEG’s NYSDOL-certified Asbestos Project Monitors are trained to ensure abatement contractors are using the proper engineering controls. Their oversight and air monitoring give building owners a safe, compliant environment, and peace of mind.
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