The American Conference of Governmental Industrial Hygienists (ACGIH) is a 501(C) scientific organization that is dedicated to advancing and improving industrial hygiene. They encourage the interchange of experience from industrial hygienists to collect and disseminate information to organization members.
They publish numerous publications including an annual publication on Threshold Limit values (TLV’s) and Biological Exposure Indices (BEI’s). These are recommendations for exposures to various contaminates. They are not standards or regulations, but safe guideline levels established by a knowledgeable body on what safe levels of exposure are without health concern. Because these values are based solely on health factors no consideration is given to economic or technical feasibility.
The ACGIH had also publish The Guide for Recommended Industrial Ventilation practice which assists industrial ventilation designers on applying applications and calculations. Industrial ventilation design is the most important aspect of implementing a dust collection system. Pressure loss calculations are required to determine a suitable fan for the dust collection system.
Important considerations when designing a dust collection system that have an impact in the pressure loss calculations include;
1. Establishing the capture velocity to capture and contain the contaminate.
2. Establish the hood pressure loss – how much energy is required to maintain CFM.
3. Establish pressure losses through elbows, duct, flex hose, branch entries and more.
4. Knowing the pressure loss through the dust collector and filters, abort gates or exhaust outlets.
5. Density correction for heat, moisture and elevation
Dust collection systems that are not designed properly can have underpowered fans that may cause issues such as:
A.) Not allowing enough air into the system to capture and contain the contaminate.
B.) Not having enough air to move the contaminate through the duct to the collector.
Poorly designed systems can lead to the accumulation of dust in the duct system. If you’re working with explosive dust this becomes an even bigger concern. Industrial ventilation design experts at Clean Air Company have undergone intensive industrial ventilation design courses to ensure your dust collection system is designed property for efficiency. We recommend third party air balancing tests to verify our designs compliance with our proposed recommendations. Designing your dust collection system to work effectively and efficiently is our primary concern.