Issue link: https://www.e-digitaleditions.com/i/1344205
March 2021 / 21 Because of this, the ltration area is too low and the differential pres- sure rises, creating a positive back pressure on the receiver bin and vent lter. The silo pressure relief valve may pop open momentarily, the gasketed surfaces on silo ange connections and the vent lter door can leak, or a combination of both of these results can happen. The solution is to apply a surge factor to the conveying system volume and then size the vent lter for the correct lter area amount. In your case, the remedy is to ask the truck operator to limit the truck's conveying line pressure to a lower value, which the truck operator might not be very happy doing because the lower pressure extends the time taken to unload the trailer. An alternate approach is to try to get more lter area in the existing vent lter by replacing it with a discharges the material. Material receiver options can include a silo, bin, hopper, cyclone, lter-receiver, or feed hopper transition to a downstream process. Q: We have a bin vent dust collector on top of our sugar silos, and during the lling from a self-unloading truck, we see a constant leaking of sugar dust, especially at the end of the truck load. Why is that? A: What you're experiencing is a typical problem with this appli- cation that's caused by the vent lter being sized too marginally. The air delivery from a pressure differential truck is often delivered to the silo in surges rather than in an even, continuous stream. These surges can instantaneously result in an actual air volume that's in excess of what the bin vent was originally expected to handle. air volume in the existing convey- ing line can be implemented. Another option is to replace the existing elbows with a geometry change or special construction material, such as applying ttings cast from wear-resistant iron or applying wear-resistant liners inside the ttings or wear-resistant coatings on the ttings' exterior, to provide a longer life between change outs. While this isn't a com- plete solution, this option may be the most cost-effective approach. Q: Our business model requires we add another set of silos in the plant and extend our existing pneumatic conveying system. What all must we consider? We tried this before, to just add a new bin indoors, and the system plugged up, so we had to abandon that new bin. A: If the situation you tried before required the same convey- ing rate to be achieved to a farther destination, my guess is the pres- sure drop went up so your velocity pro le in the conveying line went down to a point below the mini- mum conveying velocity that was needed for the material to move. This then caused the conveying line to eventually create line plugs. The same thing will happen with the new silo location unless you do one of the following: • Reduce the system rate; • Increase the pipe diameter — not necessarily all the pip- ing but maybe just the new extended pipe section; or • Increase the gas mover volume, preferably with a variable- frequency drive so that when the original system length is in use, there won't be excessive gas volume to be handled. Material receiver The material receiver is the nal stop in the system, the place where the pneumatic conveying system Keep Your Product Flowing 1.800.233.7109 | 763.574.1820 solimar@solimarpne.com | www.solimarpneumatics.com We Move a World of Dry Bulk Materials. Silo Fluidizer Pneumatic Knocker Hi-temp, metal detectable and food compatible models available. Fast unloading with no material left behind. 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