How Much Leak Test Powder Do You Need?

To determine the quantity of leak testing powder needed to run one leak test, use the following guidelines:

1. Determine total filter cloth area per filter bag: 

Filter bag total filter cloth area = filter diameter x 3.14 x length ÷ 144 = total filter cloth area per baghouse filter. 

Example: 6″ diameter x 120″ long bag = 6 x 3.14 = 18.84 x 120 = 2,260.80 ÷ 144 (number of inches per square foot) = 15.7 sq ft per bag

2. Multiply by total number of bags in baghouse (or compartment) to get a total filter cloth area

Total filter cloth area per bag x number of bags in baghouse (or compartment) = total filter area of baghouse. (e.g. 15.7 sq ft x 320 bags = 5,024 sq ft)

3. Divide total filter area of baghouse by 1,000 to obtain the number of pounds of powder to use.

e.g. 5,024 ÷ 1000 = 5.024 lbs of powder for one leak test.

The powder quantity may vary depending on the length of ductwork between the fan and Baghouse.

A Few Things to Keep In Mind

1. Try alternating between different colors each test which makes for easier identification of leaks

2. Many local, state and federal air permit require regular leak testing for baghouses. Avoid fines by keeping enough powder on hand to perform a leak test at all times.