Leak Detection Powder – Great Time Saver

Time Saving Leak Detection Powder

You can waste a lot of time looking for a leak. With Leak Detection Powder, you will be able to save a lot of time by quickly finding the problem.

Purple Detection Powder
Getting Started
Green Detection Powder
    1. Locate an inlet port in the dirty air stream to the baghouse, (on the negative side of fan) just before the baghouse inlet. The port should be at least 3” in diameter. “If a Leak Detection test is being done on a new collector or one that has just been rebagged, go to step No 3.”
    2. When doing a Leak Detection test on a unit that has been in use, turn off the bag cleaning mechanism leaving a dust cake on the bag to give a high pressure differential between the clean and dirty side of the bag. This will encourage the Leak Detection Powder to flow through any holes. Visually check the clean air plenum for heavy dust buildup and remove if possible so it won’t hide the powder that will mark the leakage points.
    3. Start the fan and introduce 1 lb. of Leak Detection Powder per 1,000 sq. ft. of filter media. (On positive pressure systems, inject before the fan.) The quantity of the powder required may vary depending on the length of the ductwork from the fan to the baghouse.
    4. After injection of the powder, the fan should be left on for approximately 45 seconds, but no longer than 1 minute. After shutting the fan off, inspect, using a UV light. For pulse type units, inspection requires opening the top door and shining the light over the clean air plenum. (Note: test must be performed in darkness for outside inspections.) For shaker or reverse air units, inspection takes place from the inside, starting with the lower level and concentrating the light around the tube sheet.
    5. Areas where leaks or holes exist, allow the Leak Detection Powder to pass through to clean side of the bag where it fluoresces brilliantly when exposed to the UV Light. These areas of fluorescence mark the location of leaks. Bleed-through of the powder sometimes occurs in woven material or bags that have been in service a long time may give the appearance of a ruptured bag. You will quickly learn to differentiate between the two effects.
    6. After all repairs have been completed, rerun the test using a different contrasting color to ensure that no leaks remain. The second color will clearly show any areas that may have been missed.

To determine the quantity of Leak Detection Powder needed to run the test, simply follow the formula below:


Diameter in inches (A) x 3.14 x length in feet (B) divide by 12 x # of filter bags/cartridges (C) = Sq. Ft. Media area (D) Since 1 lb of Leak Detection Powder per 1,000 sq. ft. of media is required, then (D) divide by 1,000 = # of lbs required for test.

Red Detection Powder
Note On Leak Detection Powder Usage
Yellow Detection Powder

If the square footage of filter media per compartment of baghouse is already known, simply divide by 1,000 to obtain the number of pounds of Leak Detection Powder to use.

Contact FabCo Industrial Services for recommended usage.


Kit Includes:

Molded plastic case, UV flashlight, UV enhancing glasses, 120V wall charger and portable 12V DC car charger.

  • Up to 4.5 hours of battery life
  • Cordless and rechargeable
  • Operates without excessive heat
  • Great for all size baghouses
Blue UV Light