Changing out dust bags in reverse pulse dust collectors. The dust bags in pulse jet dust collectors require replacement if damaged and leaking or if blinded by the product. This work procedure indicates the process and methods to use to change-out and replace dust bags and cages in a dust collector. Keywords: tube plate, bag collar, air manifold, air plenum.
- Clean out product in the plenum.
- Mark-up a tube plate map showing the location of all blocked-off bags or leaking bags and hand-in with the work order on completion.
- Lift cages out square to tube plate without damaging the cage collar. Use tee-handle hook tool that fits down the bag and hooks onto the cage wire ring two down from the top.
- Remove the bags if they don’t come out with the cage.
- Clean top AND underside of tube plate back to clean metal.
- Starting at the edge of the bag house, and doing one complete row at a time, slip bags into each hole and insure the cuff seals fully around 360 degrees of tube sheet. Line up the bag seams in the same direction.
- Inspect the cages for weld dags, galvanising dags or paint dags and for welding wire poking out. Any sharp or rough edges on the cage will rip the bag. Do not use broken or damaged cages.
- Lower the cages into the bags feeding them in gently and being careful not to drop them into place.
- Install venturis if they are separate to the cages. Replace gaskets with new ones if they are required. If separate venturis are to be installed insure the bag seam is opposite the slot in the cage collar.
- Do not step on newly fitted bags as it may ruin the seal with the tube plate. Instead plank-out across the top of the installed bags, cages and venturi and share the load across all tops.
- Insure blow tube holes are clean and pointing directly into the centre of the bag.
- Check manometer or magnehelic tapping points are clear and hoses seal and do not leak.
- Remove any planks and tools from the plenum and close up the covers.
- Check the air solenoid manifold is free of water. If water is present an automatic drain should be installed.
- Test-run the dust collector and check pressure differential across bags is below operating pressure.
- Check outlet of dust collector for sign of discharge. If discharge is present stop and isolate the dust collector and open up plenum for inspection. Look for product deposits in and around the bags indicating location of leaks.
- Sign-off the work order when job is complete and hand back the equipment to the operators.
- Mike Sondalini – Maintenance Engineer
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