A common occurrence in industrial factories and machining shops is the presence of mist; particularly oil mist.
Oftentimes, there are several large CNC and waterjet machines cutting a variety of material simultaneously for several hours a day.
This creates a steady stream of mist entering the ambient air and accumulating on surfaces. Depending on the materials being cut and the lubricant used in the machines, this mist can contain oils, minerals, and trace amounts of metals and plastics.
Exposure to oil mist in the workplace has been associated with a variety of health ailments including skin irritation, decreased pulmonary function, and irritation of the upper respiratory tract and lungs.
In order to protect workers from overexposure, OSHA and other health and safety agencies have placed limits on the allowable amount of mineral oil mist workers are exposed to. The following chart outlines these limits.
|OSHA – Permissible Exposure Limit||5 mg/m3 TWA (8-hour time weighted average)|
|NIOSH – Recommended Exposure Limit||5 mg/m3 TWA (8-hour time weighted average)
10 mg/m3 STEL (15-minute short-term exposure limit)
|ACGIH – Threshold Limit Value||5 mg/m3 TWA (8-hour time weighted average)|
|CAL/OSHA – Permissible Exposure Limit||5 mg/m3 TWA (8-hour time weighted average)|
In an effort to reduce the amount of mist entering the airstream, many facilities house their equipment within curtained walls or in a separate area entirely.
While this is a good practice, it does not completely eliminate mist exposure. For example, many CNC machines are open lathe which means the cutting area is exposed. This makes containing the mist nearly impossible.
Even if your facility uses several closed lathe machines, where the cutting area is enclosed, there is still the possibility of renegade mist escaping the machine each time the cutting area is opened.
A comprehensive approach to mist collection in the workplace should include the combined use of source-capture and general ambient air scrubbers specifically designed for mist collection.
Industrial Ambient Mist Collector
Sentry Air Systems’ new Model 2000 Industrial Ambient Mist Collector [SS-2000-MIST] acts as a secondary engineering safety control in environments were oil-laden mist is present.
Through a series of multiple pre-filters and a main filter housing specifically designed for mist applications, the Model 2000 Mist Collector scrubs the ambient air of excess mist then drains any remaining fluid through a tube at the base of the unit.
|Specifications||Features & Benefits|
For optimal use, it is recommended that the Model 2000 Mist be hung or mounted near the ceiling and positioned appropriately in relation to the source of mist emission.
For small-scale factories that use one or two CNC machines, a single Model 2000 Mist may be sufficient in helping reduce ambient mist. However, medium to larger scale factories would benefit from multiple units.
When installing multiple Model 2000 Mist units, it is important to consider their position within a room so that an optimal airflow pattern can be achieved.
Sentry Air Systems conducted stringent in-house testing to see how the unit withstands against extended use. A unit was run for a continuous 136 hours while a fine mist was dispersed at the filter inlet. Daily readings were taken and upon completion, the interior of the unit showed no signs of moisture buildup. In total, 5.6 gallons of synthetic coolant was used, mixed 10:1.
In addition, Sentry Air Systems utilized the services of a third party engineering company to review and verify that all of the electrical components used are safe for a wet environment.
Sentry Air Mist Collectors
As stated previously, the Model 2000 Mist Collector is the newest addition to Sentry Air Systems line of mist collectors. The uniqueness of the Model 2000 Mist is that it is the first unit designed specifically for ambient mist collection applications.In contrast, the other mist collectors in the line are designed primarily for source-capture applications; meaning they either mount directly to a CNC machine or are connected to an exhaust port on the CNC using a flex hose.
When source-capture units are installed, an ambient unit works as a secondary control to scrub and polish the air. When source-capture units are not a viable solution, ambient units are the next best thing in reducing mist exposure.
It is strongly recommended that you speak with a Sentry Air Systems Application Specialist to determine the most appropriate mist collection system for your unique work environment.
Contact Sentry Air
For more information about industrial ambient mist collection or to receive a free quote, contact Sentry Air Systems at 800-799-4609, email firstname.lastname@example.org, or fill out the feedback form below.