Ask the Filter Doctor

A. Dust Collector Information
Dust collector: (Make)
No. of bags
No. of compartments
Pre-filter Yes  No    Make or Type
Cage construction or design
Bag dimensions
Bag features (cuffs, rings, reinfs.)

B. Cleaning
Cleaning method On line Off line
Delta p controlled or time controlled
Cleaning frequency per row
Duration
Pressure (if pulse type)
Low Medium High air volume pulse design

C. Process Conditions
Inlet temperature
Insulation Yes No
Are there temperature excursions? Yes No
If so, frequency
Length
Maximum temperature recorded
Air flow rate:
Design
Actual
Continuous operation: Yes No
Shutdowns per year
Water dew point
Acid dew point
How often does the temperature drop below?
Water
Acid
Inlet dust load (gr/ft3)
Max. designed delta P
Normal operating delta P
EPA allowable emissions
Actual emissions
Static electricity

D. Gas Stream Composition (Vol.%, Weight %, PPM, or mg/Nm3)
H2O (Vol.% only)	SOx
O2 (Vol.% only)	SO3
NOx	HCI
NO2	HF
Others

E. Dust Characteristics
Dust type
Manufacturing process
Specific gravity
Particle size distribution
Note: BWF can provide a PSA if provided with a representative inlet dust sample (1/2 lb.)
Smooth or Abrasive
Agglomerating or Free flowing
Hygroscopic or Hydrophobic
pH of product (in water)
Any fat(s) or Oils Yes No

F. Fabric Information
Present filter media in use
Fabric construction Felt or Woven
Fiber Weight Permeability
If felt: Finish (if any)
If woven:
Weave Count Finish
Supplier and supplier style

G. Operating Conditions
Current bag life
Service life of sample
Noticeable operation difficulties (poor cake release, nodules, high pressure drop, stack emissions, premature mechanical wear or other) Please explain:

H. Desired Conditions

Emission rate < (grains/dscf or mg/Nm3)

Bag life > Months

If possible we may ask you to submit a sample, media sample and used bag for analysis.