Differential Pressure is a Critical Baghouse Performance Metric
Successfully operating your dust collector means carefully monitoring the differential pressure on each unit. Differential pressure is the principal operating metric used to monitor performance of a dust collector.
Most modern collectors operate at peak collection efficiency between 2” - 6” of differential pressure. For this reason, many air permits (as well as operating documentation) specify a DP range for the collector "not to exceed" in order to achieve emissions compliance. This is combined with other performance considerations, such as rising or falling airflow throughout the system, to provide an operating view that is monitored in parallel with the emissions output readings.
What to Do When DP is too High or too Low?
Below we have a list of the first things technicians should check when they see differential pressure abnormally high or low.
- Double check DP reading (disconnect DP airlines and connect them to confirmed working magnehelic gauge in hand. Make sure to connect airlines to correct sides of the gauge.)
- Blinded bags (dirty bags have more resistance to airflow)
- Leaking bags (holes make bags more permeable thus lower resistance to flow)
- Incorrectly installed bags (loose bags allow air to pass by thus offering no resistance)
- Leaks within structure (holes or corrosion at welds and joints)
- Leaks within airlock (worn out flaps, rotors, and at flanges)
- Conveying system connection leaks
- Doors and hatches (leaks around frame, gaskets and misaligned locking mechanisms)
- Check for changes to plant process (increased flowrates, temperature spikes, batch contamination, operator error, etc.)
After checking these initial areas of concern you will likely find the source of the anomalous reading. If not, the problem may lie with a design flaw or malfunctioning of the cleaning system. In such cases, consult a troubleshooting guide from a reputable OEM or service provider for more information. Our Baghouse Maintenance Guide is a great place to start and our Dust Collector Maintenance Checklist is a handy tool too.
Many plants have benefited by adding realtime emissions monitoring to their dust collection systems with triboelectric dust detection systems from Auburn. Along with emissions monitoring, these systems also provide bag leak detection capabilities to help prevent leaks before they become reportable events. Contact Auburn today find out more!