Refractory is the layer standing between a two-thousand-degree flame and a bare steel shell, so once it starts failing, the shell itself is next in line. Most refractory failures don't happen overnight, they show up first as a small hot spot or a hairline crack that gets noticed only if someone is actually looking. This checklist covers the points worth checking on every refractory inspection round. Sign up to track refractory condition against the kiln asset instead of a paper file.
6 Checks
Core refractory checks worth running on every inspection cycle
200°C
Rough shell temperature rise that usually signals lining loss underneath
Weekly Scan
Recommended frequency for a full infrared shell scan during operation
Every Stop
How often the internal lining should be visually walked, not just scanned from outside
Why Refractory Gets Its Own Inspection Routine
A worn lining doesn't just risk a shell burn-through, it changes heat distribution inside the kiln and can quietly hurt clinker quality long before anyone sees a visible problem. Catching wear early is almost always cheaper than an unplanned relining.
Visual & Thermal Checks
Infrared Shell Scan
Scan the full shell length and compare against the previous scan to catch new hot spots early
Brick Joint Condition
Look for widening joints or gaps between bricks whenever the kiln is down and accessible
Coating Buildup Pattern
Check whether protective coating is forming evenly, since patchy coating often points to an underlying hot area
Catch Refractory Wear Before It Becomes A Shutdown
Oxmaint logs every shell scan and lining check against the kiln asset, so a rising trend is visible long before it becomes an emergency. Sign up for a free trial to build your refractory inspection route, or book a demo to see it in action.
Wear & Damage Patterns To Watch
Localized Erosion
Note any area wearing faster than the surrounding lining, often near the burning zone or feed end
Cracking & Spalling
Check for cracked or flaking brick faces, which often follow a thermal cycling event or rapid cool-down
Remaining Lining Thickness
Measure residual thickness at known wear zones and track it against the last few inspection cycles
What A Reading Might Be Telling You
| What You Notice |
Possible Cause |
| New hot spot on the shell |
Localized lining loss or a coating that has fallen away at that point |
| Patchy coating buildup |
Uneven kiln temperature profile or an early sign of thinning brick underneath |
| Widening brick joints |
Shell ovality or thermal cycling stress working the lining loose |
| Rapid thickness loss |
Aggressive process conditions or a refractory grade mismatched to that zone |
Logged Readings vs A Digital Refractory Record
Logged On Paper
Thickness readings scattered across old shutdown reports
No easy way to see which zone is wearing fastest over time
Relining decisions made on memory rather than data
Tracked In A CMMS
Every reading tied to a specific zone on the kiln asset
Wear trends visible instantly across every inspection cycle
Relining planned around actual remaining life, not guesswork
Where A CMMS Fits Into Refractory Inspections
Oxmaint turns this refractory checklist into a recurring inspection tied to the kiln asset, mapping thickness and hot spot readings by zone so relining decisions are based on trend data instead of the last person's notes.
Frequently Asked Questions
Q
How often should refractory be inspected?
An infrared shell scan is worth running weekly during operation, while a full internal visual walk should happen at every planned stop when the lining is accessible.
Q
What does a rising shell temperature usually mean?
A localized rise, often around 200°C above the surrounding shell, typically points to refractory thinning or coating loss at that specific spot rather than a broader process issue.
Q
Can a CMMS help plan relining schedules?
Yes, by tracking thickness readings by zone over time, a CMMS can show which sections are approaching their wear limit well ahead of the next major shutdown.
Turn Refractory Inspections Into A Trend You Can Trust
Oxmaint captures every hot spot, joint condition, and thickness reading against the kiln asset, so wear patterns are visible long before a lining fails. Sign up for a free trial to build your refractory inspection route, or book a demo to see it in action.
