When a plant handles many coil diameters, the support decision is no longer one support per size. The real question is how to group coils into layers, how to define the 100 mm support pitch, and when a master frame with auxiliary bays can increase usable density without turning the aisle into a bottleneck.
Plants dealing with mixed coil families often lose time in the same place: diameter changes force a new storage rule, a new picking path, or a new support. A better approach is to treat the support as an adjustable system. In the Carack layout, the retaining support sits on a perforated upright, and the roller seat can be repositioned in 100 mm steps. This allows one frame family to hold coils from approximately Ø737 to Ø2007 mm without building a separate support line for each diameter.
Group coils by diameter range, then assign the layer
Start with two ranges instead of a long list. Larger coils belong on the lower layer because they are harder to lift, create a lower center of gravity, and need a clearer approach for the forklift. Smaller coils can go on the upper layer if the shaft line still meets the support rollers cleanly. In practice, a pair of supports should be treated as one coil seat unless the project agreement states otherwise. This keeps the load path simple and prevents the support from becoming a custom puzzle at every picking point.
Set the support pitch on the coil centerline, not on the catalog size
The useful number is not a support size. It is the height of the support line relative to the coil centerline. The 100 mm pitch matters because it allows fine adjustments without changing the entire frame. For a mixed coil plant, this means the same upright can be adjusted for different core heights while the roller support keeps the contact surface aligned. The close-up support photo shows the bolted roller assembly: double metal rollers, heavy-duty mounting bolts, and a blue upright. That is the mechanical reason the support can be adjusted without relying on a fixed cradle.
Use the lower layer for heavy coils and the upper layer for lighter ones
For a mixed inventory of Ø737–2007 mm, the lower layer should carry the larger, heavier coils, as it is safer for handling and easier to access with a truck or forklift. The upper layer should not be treated as extra storage at any cost. It is the layer for coils that can be lifted, rotated, and returned without pushing the operator into uncomfortable reach zones. This is where the structure shown in the aisle photo matters: the braced frame keeps the bay rigid while multiple coil sizes sit in a single continuous line.
What does the auxiliary bay really add?
An auxiliary bay adds density when it eliminates duplication. If each coil diameter has its own isolated support line, the plant pays twice: once in steel and once in aisle space. A master frame with auxiliary bays combines sizes into a single organized aisle, so the density gain comes from reducing dead gaps and redundant aisles. The exact increase is not a catalog number. It depends on the coil mix, aisle width, and how many diameters can share the same support logic. That is why the final layer count and load limit must still be defined in the technical agreement, not copied from a general brochure.
Where this layout fits and where it does not
This layout is a good option when the plant has mixed coil sizes, frequent movement, and a need to keep storage within a single aisle. It is not the right choice when each coil family must be stored in a separate certified cell, when core width is highly irregular, or when outdoor exposure requires a corrosion protection package that has not been approved. In those cases, the frame concept remains the same, but the coating, anchoring, and layer count must be rechecked before release.
Planning checklist for a mixed coil support
- Confirm the coil diameter range and group sizes before setting layer heights.
- Use 100 mm support adjustments to align with the coil centerline instead of forcing a fixed cradle.
- Place heavier coils on the lower layer and keep forklift access clear.
- Let auxiliary bays increase density by removing duplicate support lines, not by overcrowding a single bay.
Perguntas Frequentes
How many coils should I place on one layer?
There is no universally safe answer. A conservative layout treats one pair of supports as a coil seat and then checks whether smaller coils can share the same bay after the centerline and clearance are verified. The final count must follow the project agreement.
Is the 100 mm support pitch a fixed catalog promise?
No. It is a practical adjustment method. The pitch gives the installer room to align rollers to different coil geometries, but the final configuration still depends on the coil diameter, core width, and handling method defined for the project.
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