Pulse Jet Pointers
Vol. 2, No. 3

If you have a heating system failure, there is a slight chance we are the wrong people to call, but only a slight chance. If the problem is in the heat exchanger, heating coil, or the fan unit, we can help. If the filters are plugged, we have replacements. We also have energy-saving ceiling fans.

Two of our suppliers have recently introduced polyester felt media elements to replace the old paper cartridges in pulse jet collectors. A 37 sq. ft. element by Industrial Filter Industries uses 20-ounce singed polyester felt with reported efficiencies of 99.9% on 1.0 micron particles and above. A 28-sq. ft. element by Gore-Tex uses teflon membrane on 12-oz. felt with reported efficiencies of 99.99% on .33 micron particles. 

New high-ratio elements compared
after test run in cement plant.

1. Directly Interchangeable
   New elements are built to the same dimensions as existing paper cartridges (12-3/4" O.D. x 26" long).
2. Wide Pleat Construction
   Pleats are nearly 1" apart. This, in addition to excellent release capability, gives good product release even in high grain loading applications.
3. Lower Pressure Drops
   Ready release of particles collected on the smooth non-stick PTFE membrane surface (Gore-Tex), or singed polyester (Industrial Filter), rather than in-depth cake filtration on or in the media, allows low pressure drop operation with the possibilities of reduced fan energy and compressed air costs.
4. Increased Life
   Continuous lower pressure drop operation, restriction of the particles from penetration into the felt, and less frequent cleaning — reduce wear, significantly extend life, and cut maintenance cost.
5. Increased Product Throughput
   LBS/HR Excellent release from the surface of moist, sticky or fine particles results in higher air flow and product throughput.
6. Less Downtime
   Continuous maximum air flow, lower pressure drop, and increased ability to survive process upsets and moisture result in less downtime and increased production.

We still see many customers "booting up" new operations without considering atmospheric contamination. Call us during the planning stages. We can make valuable suggestions that will keep your project free of dust and fumes — probably at less cost than a "retrofit" later. You can be sure your future plans and developments — be they successes or failures — will be held in confidence.

The riddle posed in the last issue was:

We've counted the cats in Kildare.
They number the third of a square.
If a quarter were slain
Just a cube would remain
How many, at least, must be there?

Let n be the number of cats, which must be an integer. Let s² be the square, hence n = 1/3s² Let c³ be the cube, and we have 3/4n = c³ or n = 4/3c³: hence c³ must be an integer divisible by 3. By equation 1/3s² =4/3c³ or s = 2c^3/2 Now for what least c, an integer, is c^3/2 an integer, and c³ divisible by 3? Trying c = 9, we have s = 54 and n = 972; and 3/4 x 972 = 729 = 9³.

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