A preheater cyclone separates hot gas from raw meal at temperatures that can exceed 900°C, and it does this continuously while raw meal buildup, refractory wear, and blocked dip tubes all work to choke its airflow. A cracked refractory lining lets the shell overheat, a blocked riser duct forces a costly unplanned shutdown, and a rising pressure drop across the string often means a buildup problem before anyone sees it. This checklist covers what to verify across refractory, buildup and blockage, and pressure drop monitoring. Sign up to turn this checklist into a guided digital procedure your preheater crew follows on every inspection round.
3 Zones Checked
Refractory, buildup and blockage, and pressure drop covered in this checklist
900°C Range
Typical gas temperature the refractory lining must withstand continuously
Every Shift
How often pressure drop readings across each cyclone stage should be logged
Zero Tolerance
Room for skipping a dip tube inspection or a hot spot scan
Why Cyclone Checks Can't Be Rushed
A blocked cyclone stage doesn't just slow production, it can force an emergency kiln stop to clear a choked riser duct. The same refractory, buildup, and pressure drop checks repeated correctly every shift catch a developing problem while it's still a quick fix.
Refractory & Shell Inspection
Refractory Lining Condition
Check the inner lining for cracking, spalling, or thinning, especially at the cone and dip tube entry
Shell Hot Spot Scan
Run a thermal scan across the outer shell to catch a hot spot that signals refractory has worn through
Expansion Joint & Support Check
Inspect expansion joints and support brackets for cracking caused by repeated thermal cycling
Make Cyclone Checks A Habit, Not A Memory
Oxmaint guides your crew through refractory, buildup, and pressure drop inspections step by step, with photo proof and sign-off logged against each cyclone stage. Sign up for a free trial to build your preheater routine, or book a demo to see it in action.
Buildup & Blockage Checks
Dip Tube & Riser Duct Buildup
Inspect dip tubes and riser ducts for raw meal buildup that narrows the gas path and raises resistance
Cone & Outlet Blockage
Check the cone outlet and rotary feeder for material bridging that can choke material flow entirely
Air Cannon & Cleaning System
Verify air cannons and cleaning systems fire on schedule and actually clear buildup at each nozzle point
Pressure Drop Monitoring
Stage-By-Stage Pressure Drop Log
Record pressure drop across each cyclone stage per shift and compare against the normal baseline range
Sudden Rise Investigation
Investigate any sudden pressure drop rise immediately, since it usually points to a fresh buildup or blockage
Gas Analyzer & Draft Fan Check
Cross-check draft fan load and gas analyzer readings against pressure drop trends to confirm the cause
What A Skipped Check Can Cost You
| Check Skipped |
Likely Consequence |
| Dip tube buildup check |
Narrowed gas path raises pressure drop and cuts preheater efficiency |
| Refractory lining check |
Worn lining lets a hot spot develop, risking shell damage |
| Cone outlet blockage check |
A bridged cone chokes material flow and forces an unplanned kiln stop |
| Pressure drop logging |
A slow buildup trend goes unnoticed until it becomes a full blockage |
Where A CMMS Fits Into Cyclone Checks
Oxmaint ties this checklist to each cyclone stage as a tracked asset, logging pressure drop readings and refractory condition over time so a rising trend gets flagged before it turns into an unplanned stop.
Frequently Asked Questions
Q
What does a rising pressure drop across a preheater cyclone usually mean?
A steady rise in pressure drop across a cyclone stage usually points to raw meal buildup narrowing the gas path, and it's worth checking the dip tube and riser duct before the trend worsens.
Q
How often should cyclone refractory be inspected?
Refractory should be visually inspected at every planned shutdown, with a thermal shell scan run more frequently, since a hot spot can develop between shutdowns as lining wears thin.
Q
Can a CMMS track pressure drop trends automatically?
Yes, a CMMS can log pressure drop readings per shift against each cyclone stage and flag a reading that drifts outside the normal baseline before it becomes a blockage.
Keep Your Preheater String Running Without An Unplanned Stop
Oxmaint guides your crew through refractory, buildup, and pressure drop inspections and logs every reading against each cyclone stage automatically. Sign up for a free trial to build your preheater checklist, or book a demo to see it in action.
