Author：yilida Time：2026-10-30 15:55:01 Number of views：72Second-rate
Most dust collection failures are not dramatic — they are a slowly rising pressure drop, one leaking diaphragm, a bridged hopper, a worn airlock rotor. Plants that treat spare parts as a planned inventory rather than an emergency purchase keep capture efficiency stable and avoid unplanned shutdowns. This guide lists the parts worth stocking, the inspection intervals that catch problems early, and the symptoms that tell you which part has failed.
Filter bags / cartridges: at least one compartment set or one full change for critical systems.
Cages (bag supports): the same quantity as spare bags; bent cages ruin new bags fast.
Electromagnetic pulse valves and diaphragm kits: the most common single failure point.
Valve coils, gaskets and O-rings: cheap, and the reason many systems leak.
Star discharger (rotary airlock) rotor, seals and drive: hopper discharge is mission-critical.
Screw conveyor and scraper conveyor wear parts: liners, flighting, chain and sprockets.
Bucket elevator belts and buckets: for recovery and silo-feed systems.
Level indicators, ΔP gauges and transmitters: instrumentation you cannot diagnose without.
Replace on differential pressure trend, not on a fixed calendar. When cleaning can no longer bring ΔP back to the normal band, or when outlet readings show break-through, plan the change. Always replace cages that are bent, corroded or have sharp welds — installing new bags on damaged cages is the fastest way to repeat the failure.
Check tube-sheet holes, snap rings and gasket seats before fitting new bags.
Match media to actual temperature and chemistry; re-evaluate after any process change.
Replace a full compartment rather than mixing old and new bags, which causes uneven loading.
Record installation date and ΔP baseline for every compartment.
A single failed diaphragm can stop cleaning for an entire row, and a weak pulse is easy to miss. Listen for each valve during a cycle, and use ΔP per compartment to spot rows that are not cleaning.
Dust that is not discharged re-enters the gas stream and overloads the filter. Keep rotary airlocks running, check rotor clearance and seals, and service the drive. For larger systems, maintain the screw conveyor, scraper conveyor and bucket elevator on a defined schedule; a failed conveyor backs dust into the hopper within hours.
| Frequency | Tasks |
|---|---|
| Per shift | Read ΔP, check discharger operation, confirm bin/silo level, listen for pulse valves |
| Weekly | Drain air receiver, check dryer, inspect duct and hopper for build-up, verify gauge readings |
| Monthly | Inspect bags/cartridges, check grounding, verify compressed-air pressure at the manifold, test level indicators |
| Quarterly | Calibrate ΔP instruments, inspect conveyor wear parts, check fan belt and vibration, review emission trend |
| Annually | Plan compartment bag replacement, inspect housing corrosion and insulation, review spare-parts stock against consumption |
| Symptom | Likely cause | First action |
|---|---|---|
| ΔP rises steadily | Weak pulse, wet air, blocked airlock | Check valves and discharge device |
| ΔP very low, outlet dusty | Bag break-through or poor sealing | Inspect bags and tube sheet |
| Hopper bridging | Moist dust, Airlock stopped | Add vibration/heating, repair drive |
| Uneven compartment ΔP | Distribution or pulse header fault | Balance dampers, check header pressure |
| Bags fail at bottom | Abrasion, cage burrs, high velocity | Replace cages, lower filtration velocity |
| Condensation in housing | Below dew point | Insulate, pre-heat, review start-up procedure |
Send the equipment model or a nameplate photo plus these details: bag diameter, length and fixing type; cage wire count and coating; pulse valve size, voltage and coil type; airlock model, rotor type and drive specification. A dimensional drawing or sample of the old part removes nearly all risk of a wrong shipment.
Typically 12–24 months for polyester and 18–36 months for high-temperature media, but always decide from the differential-pressure trend rather than a fixed date.
Pulse valve diaphragms and coils, followed by rotary airlock seals and drives. Keep both in stock for critical systems.
Only if they are straight, smooth and corrosion-free. Damaged cages are a leading cause of premature bag failure.
Usually a cleaning-side fault — weak pulse pressure, wet compressed air, a blocked header or a discharge problem — rather than a media problem.
Before requesting a proposal, collect these five items: airflow (m³/h), dust type and particle size, gas temperature, available installation space and the local emission limit. With these five figures, a sized selection, filter-media recommendation and spare-part list can be produced quickly and accurately.
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