Building a repeatable ceramic lining inspection map

Use features that survive cleaning, repair and partial replacement: a flange orientation, centreline, manway, structural seam or permanently marked reference. Avoid buildup edges, temporary scaffolding and the boundary of a repair as the sole origin. On cylindrical equipment, define viewing direction, clock orientation and axial start point; on chutes, define upstream and downstream plus left and right as seen in one stated direction. Put the convention on every sheet. A coordinate such as ‘upper left’ is useless when the next inspector enters from the opposite opening. Photograph the datum itself so a later team can reconstruct the map.

Zone boundaries should follow fixed geometry or a regular coordinate grid, not the current edge of the worn area. Name transfer inlet, first-impact wall, lower transition or spool segment where those features are permanent, then subdivide large surfaces into manageable cells. Keep identifiers short and unique across the equipment. If the lining layout has numbered rows or pieces, relate those identifiers to the equipment coordinate rather than replacing it; tiles may be renewed while the steel reference remains. Include openings and hidden or inaccessible areas on the map so absence of data is recorded instead of being mistaken for an inspected, sound surface.

A pin marks a small chip; a line can represent an open joint or crack; a polygon can show an area of polished, missing or suspect lining. Choose a simple symbol set and keep condition description separate from severity or action status. Record the start and end coordinates of linear features and the boundary of larger areas, not only their approximate centre. Where exact measurement is impossible, identify the location as estimated and state the reference used. This spatial discipline lets reviewers see whether several symptoms share one boundary, align with a process path or cluster around an opening without forcing a causal conclusion into the map.

Assign each image an identifier tied to the map cell and show its viewing direction. Begin with an orientation image that includes the datum, then take closer views with a scale where safe and useful. Mark camera positions or use fixed features to reproduce them at the next shutdown. Keep the original file and link its identifier rather than pasting an untraceable compressed screenshot. If a cleaned view and an as-found view exist, label both; they answer different questions. A photograph without location, direction and date may illustrate damage, but it cannot reliably demonstrate whether the footprint expanded or moved.

Preserve each dated map as an inspection snapshot and create a comparison layer that shows new, unchanged, expanded, repaired and not-observed areas. Do not erase a former defect after repair; link it to the repair boundary and new baseline. Align maps on the permanent datums before interpreting movement. If a zone definition must change after an equipment modification, retain a cross-reference between old and new coordinates. Overlaying throughput, feed direction or cleaning changes can support review, but keep those operational layers distinct from observed condition. The result is a spatial record that can guide targeted follow-up without pretending the map alone proves cause.