Simple Cloth Size Check

Baghouse sizing is done by the manufacturer. This example will show you how to verify the
manufacture’s measurements by doing a simple cloth size check. Given the process gas
exhaust rate and the filtration velocity, you can estimate the amount of cloth required by the
baghouse. Once you know the total amount of cloth required and the dimensions of a bag, you
can calculate the number of bags in the baghouse.

Problem
Calculate the number of bags required for an 8-compartment pulse-jet baghouse with the
following process information and bag dimensions.

Solution
1. Calculate the total gross cloth area.

2. Determine the amount of fabric required per bag. Use the formula:

3.Calculate the number of bags required in the baghouse.

So there will be an even number of bags in each of the 8 compartments, round the
value 1326.96 up to the next highest multiple of 8 (i.e. 1,328). Thus, there will be 166
bags (1,328/8) in each compartment.

4. Calculate the net air-to-cloth ratio. The net air-to-cloth ratio is the A/C ratio when one compartment is taken off-line for bag cleaning or maintenance. Use the formula:

5. Calculate the net, net air-to-cloth ratio (when two compartments are off-line).