AEC Self Cleaning Continuous Filters - Manual (Page 27)

Self Cleaning Continuous Filter Chapter 3: Installation 26
Adjusting Mounted Latches
Adjustment should be made by turning the adjustment screw to its tightest position and
backing off to the desired setting (See Column 2 above).
It should be possible to feel the adjusting screw slipping into the relaxed position at each half
turn.
Installing the Compressed Air Cleaning System
Air Consumption
The average amount of air that is consumed is listed on the drawing for each collector. This
is based on a six second pulse interval, “OFF-TIME”, and a pulse duration of 0.05 seconds,
“ON TIME”, which are average settings for most applications and can be varied up or down
depending on the type of dust and dust loading. For example with a very light dust loading,
the “OFF TIME” could be set at 12 to 18 seconds thus reducing the air requirements to ½ or
1/3 of the stated volume. A corresponding reduction in the size of the air supply piping may
be made.
Air Supply Piping
A 1” to 2-1/2” O.D. compressed air supply pipe furnishing 85 to 100 psig air (whether all or
no other equipment on the same line is used) should be connected to the air header. Refer to
Figure 15 below for recommended pipe sizes. Higher pressures shorten bag life, lower
pressures do not adequately clean the filter bags. It is a good practice to blow down the air
supply piping before connecting it to the air header. This removes any debris in the supply
pipe before it is connected to your collector.
Figure 15: Recommended Pipe Sizes
Total Free Air
Consumption
Up to 100 Ft. Up to 500 Ft. Up to 1,000 Ft.
Up to 50 SCFM 1” O.D. 1-1/4” O.D. 1-1/4” O.D.
51 to 100 SCFM 1-1/4” O.D. 1-1/2” O.D. 2” O.D.
101 to 200 SCFM 1-1/2” O.D. 2” O.D. 2-1/2” O.D.
Air Quality
Dirt, scale or foreign matter in the piping can cause problems of the air pulsing system. Oil
in the air supply can eventually cause plugging of the bags. Water in the system can cause
valve problems, plus the chance of freeze-up in a cold atmosphere. It is therefore, necessary
that the air be clean, dry and oil-free. The air receiver should have an automatic moisture
drain. In-line air filters with automatic drains may suffice if moisture content is not too great
and if kept from freezing. However, if a large amount of moisture or oil is present, a
desiccant-type filter is recommended.