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Neundorfer News - January, 2010


Fabric Filter (Baghouse) Technical Tip

Use Differential Pressure Set Points to Prevent Baghouse Over-cleaning


The typical filter media in a baghouse, with the exception of PTFE, relies on a controlled dust layer to capture fine particulate and protect bags from premature blinding restriction. (Blinding occurs when particulate becomes trapped within the fabric's indices.) If this dust layer is constantly being removed due to over-cleaning, the result is excessive emissions and greatly reduced bag life.


Preventing over-cleaning is best done by controlling the baghouse cleaning/dust layer based on differential pressure set point--High and Low. The High set point should initiate cleaning, and the Low set point should stop it.     


Both settings are critical, but the Low set point is most important because it optimizes collection efficiency and bag life by ensuring the control dust layer is not being removed. This Low set point should be the minimum differential pressure you would ever want the collector to operate at under normal operating conditions.


Set points vary somewhat depending on the collector's design and the bag media being used. However, a typical range is 3.0 inches of water for Low and 6.5 inches for High. Check with your bag supplier for operating range recommendations.


Remember: over-cleaning your baghouse is worse than under-cleaning. Always clean based on differential set points to maximize collection efficiency and bag life.


Visit our website to learn more baghouse best practices. Or, call us anytime for advice: (440) 942-8990.



   A protective dust cake lengthens bag life.




Electrostatic Precipitator (ESP) Technical Tip

Monitor V-I Curves to Proactively Discover and Resolve ESP Issues


Regular monitoring of key performance indicators is a smart way to keep your ESP running efficiently. Small problems are likely to eventually become big ones, or even de-rate crises, so it makes sense to head off issues at the pass by making best use of the operational data available.


One key indicator that's often overlooked is the V-I curve (voltage current relationship between T/R sets). Regular monitoring of V-I curves can provide useful insight into why changes in system performance occur over time. From these readings, it's possible to uncover a variety of problems, such as fluctuations in resistivity, that can be fixed more easily if caught early. 


While it’s true taking a V-I curve reading requires ramping the T/R set down and back up, which can cause a short opacity spike (especially with outlet fields), the useful data rendered from this short blip is well worth it. Checking V-I curves should be part of your maintenance and troubleshooting routine along with voltage control calibration and resistivity testing.


Despite the potential utility of V-I curve data, almost no-one monitors this key indicator on a regular basis. So, if you haven't made a New Year's resolution yet, try this: I will regularly perform V-I curve monitoring and use this information to proactively address ESP problems.


Example of "normal" V-I curve values.

 New Year, Neu U: Precipitator and Baghouse Seminars

What: Precipitator and Fabric Filter (Baghouse) Workshops

When: February 1-2, 2010 (precipitator) and February 3-4, 2010 (baghouse)

Where: Neundorfer training facility in Willoughby, Ohio

How much: $1,100 each (includes meals and learning materials)

Why: Learn practical skills, earn professional development credits


Neundorfer is excited to announce our annual Precipitator and Baghouse seminars! These highly interactive, practical learning events learning events are designed for anyone who needs to understand the impact of system or process changes in order to make the best decisions using available resources and options.


Each of the seminars runs 1 1/2 days, and can earn you up to 12 hours of professional development credit, depending on your state's guidelines. Attend both and knock off as many as 24 hours of credit!


Need justification to attend one or both of the seminars? Here are some points to consider.


·         Get your year off to a great start by earning up to 24 professional development credits. Each seminar is worth 9-12 credits, depending on the requirements in your state.

·         Reduce travel hassles and costs by attending both seminars, back-to-back in the same week.

·         Get the maximum value for your training and travel dollar by attending both seminars. Now's the time of year to put training dollars to the best use, before they get allocated elsewhere.

·         Make a practical investment in your knowledgebase by attending these seminars, designed specifically for decision-makers.

·         Learn about baghouses and precipitators from experts with decades of troubleshooting, design and maintenance experience.


For a full schedule of seminar activities, visit




Winter in Northeast Ohio


During the first week of 2010, several feet of snow accumulated in Willoughby, Ohio and surrounding areas, the effect of Lake Erie weather patterns. After a week spent digging out from daily snowfalls, Mae Kowalke, Manager of Stories, took this photo in LeRoy (about 30 minutes East of Neundorfer's headquarters). Winter. We love to hate it.