b'Reference Information / Filter Bag Change Out TipsInstalling filter bags is not the most sought after task at aCage/Bag Removalplant. It is a dirty job by nature. It can also be dangerous ifBefore pulling all the bags out of the collector take out a you dont know what you are doing. If you are the least bithandful first and test the intended replacements, both bag hesitant Standard Filter has professionals in your area thatand cage. Pay attention to fit of the bag onto the cage and can perform this task for you at a reasonable rate. If youthe snapband fit of the bag into the collector. If all is well feel you can manage the change-out on your own, herecontinue on. At times, crews have ripped out and discarded are a few tips for executing a bag change out with minimalan entire set of bags only to find the replacements are headaches. This should not be considered a complete list.incorrect, mislabeled or not in stock. Work methodically There are many precautions unique to certain industriesone row at a time. If the cages are to be re-inserted, handle for the dust collected such as lead, coal, etc., that requirethem with care. extensive training and safety precautions. If in doubt use a professional service. (These tips are based on changing outBag Insertiona pulse-jet unit but in some cases may be applicable forPulse-jet baghouses are classified typically as bottom or shaker and reverse-air collectors as well). top removal. This means bags are removed and installed from the dirty side (bottom), or clean side (top) of the tube Planning sheet. Baghouse designs have moved away from bottom Set aside plenty of time for the bag change-out. If theload in favor of the cleaner and easier installation available baghouse is run at elevated temperatures add in extrathrough the top load process. For snapband/snapring time for cool down especially if the design of the baghousebags, be sure to clean (wire brush) the cell plate hole to requires entry inside. Check stock for both bags and cages.insure a proper seal. The bag should snap in using hands Also have on hand diaphragm valve repair kits in case anyonly (see page 26). Take extreme care when inserting of the pulse valves are found not to be firing. membrane bags. Use a protective sleeve to prevent damage to the membrane. Shut DownRun a clean gas stream through the baghouse prior toCagesshutting down the fan. Clean down bags after fan has shutCages in general should last 3-5 change outs before being down for maximum cleaning. Be certain all dust has beenreplaced. In a highly corrosive atmosphere they may need conveyed from the hoppers to prevent cementing to be changed at every re-bagging. Check the cage for or compaction. broken stringers, bad weld or excessive corrosion before re-inserting into the bag. A loose stringer or bad weld may Access create only a pin hole but that will grow over time to a First and foremost is safety for the workers involved.significant hole as dust takes the path of least resistance.Baghouse interiors are often elevated areas with confined entry ways. Proper training and certifications are necessaryClose Upbefore entering to begin bag installation. Full respiratoryBe sure to account for all tools brought into the collector. gear and eye protection are required. If you have doubtsCheck the hopper section especially for dropped tools Standard Filter can send a professional installation crew toand bags. Items like those will not do well with your rotary your site to perform the work. airlock or screw conveyor system. Verify all door seals are seated properly to prevent outside air/moisture from being Interior Clean-up drawn into the baghouse.After you have opened the access doors look around the tube sheet floor for accumulations of dust. IdentifyLeak Check these locations and pay extra attention to the bags youAfter you have installed all the bags it is time to check will remove from those areas. Also note accumulationsyour work. This is done through the use of LDP tracing along the sides or any seams of the baghouse. These maycompound. This specially formulated fluorescent pigmented indicate a leak in the baghouse structure itself. If possiblepowder is added to the inlet based onrecord digital photographs before beginning work. a specific formula (see page 24).www.standardfilter.com1.800.634.58371.760.929.8559 27'