Automotive, manufacturing & aerospace
The racking movesas often as the product
A plant re-cuts its storage every time a programme changes. Each of those changes makes a different structure, and a different structure needs a new calculation before it holds anything.
The load
Heavier, and rarely uniform
A rack is rated for a uniformly distributed load. Very little of what a plant puts on one is uniformly distributed, and the gap between those two sentences is where the capacity question actually lives.
- Returnable containers and stillages
- Stacked, welded and heavy before anything goes in them. They land hard, they sit on a footprint smaller than the pallet the bay was designed around, and they come back from a supplier bent more often than anybody records.
- Castings, dies and tooling
- Concentrated weight over a short span. A load that puts its mass in the middle of a beam is not the load the beam was sized for, even when the total for the bay is inside its figure.
- Coil, blank and long stock
- Long, round or awkward, and frequently not on a pallet at all. Where it does not fit a bay it belongs on cantilever arms rather than on a pallet rack with a support improvised under it.
- Line-side work in progress
- Moves with the schedule. It is the stock most likely to end up somewhere it was never planned for, on a level somebody added on a Friday.
- Finished units waiting to ship
- The one part of a plant that behaves like a distribution centre — and the one place plant racking takes distribution-centre traffic, from drivers who spend the rest of their shift somewhere quieter.
CSA A344 sets the minimum capacity of every component as the sum of the maximum weight of everything it supports — no reduction for average weights, none for a fill factor. In a run that holds five different things over a year, that arithmetic is the difference between a rated rack and a hopeful one.
The racking is the cheapest thing in the aisle.
A bay out of service in a distribution centre costs a lane. In a plant it can stop a feed to the line, and what that costs is not measured in steel. It is also why repair work here is planned into a window rather than dropped into one.
When the layout changes
Every reconfiguration is a re-certification
Moving a beam down a notch to fit a taller container is a ten-minute job for two people and a structural change to the rack. What CSA A344 says about that is not ambiguous.
Nothing moves without approval
Reconfiguring a rack or changing beam heights is not permitted without an engineer's approval or certified documents, because the change can create an overload condition. That is the standard's own position, not a service policy of ours.
The structure is recalculated
A component change or a system reconfiguration requires re-certification of the structure by an engineer, and a run that has been relocated is treated the same way as a new installation.
New plaques, new drawings
The load plaque has to state both the capacity of the bay and the maximum unit load the beams may carry, and reference the drawings that establish the limit. A plaque describing the previous configuration is worse than no plaque at all.
The as-built matches the floor
Any deviation from the installation drawings is approved and recorded on as-built drawings — which is what gives next year's inspection something true to measure the racking against.
This is why capacity certification, not inspection, is the service a plant buys most often. The annual inspection still happens and still matters — but in a distribution centre the document goes stale on a calendar, and here it goes stale on a programme change, which nobody schedules around the racking.
The system
Heavier, more irregular, and moved more often
Storage in a plant answers to the process rather than to a density target. Five things come up on nearly every floor, and the first is the one most often skipped.
- Roll-formed or structural — a decision, not a default
- Frames are made from cold-formed thin-wall sections or from structural steel, and the two differ in shape, width, gauge, steel properties, forming process and how the beams attach. Which one a run should be is a design decision made against your loads and your trucks. It is worth asking who made it on your last installation.
- Cantilever for anything long
- Bar, tube, extrusion, and any load with no pallet under it. Arms fixed to vertical columns, with end stops so nothing rolls off. It is a different family from a pallet rack, with its own engineering and its own inspection.
- Drive-in or push-back for buffer, not for pick
- Density where one part number sits in volume. In a drive-in the truck enters the structure, so column guards on those legs, anchored to the floor, are part of the design — and the tunnels have to be partly emptied before anybody can assess them.
- A mezzanine when the floor runs out before the roof does
- Plants run out of square metres long before they run out of height. A mezzanine buys the area back without moving the building — and it is a building project with a code behind it, not a rack order with legs.
- Protection where the traffic actually is
- Column guards at a height that matches where the damage lands, row-end protectors on the through routes, heavier bottom bracing where it earns its place. Repeated damage at the base of a column is the standard's own signal to add guarding or change the layout.
FAQ
Questions we get
It is the most common thing we find. CSA A344 does not permit a rack to be reconfigured or its beams moved without an engineer's approval or certified documents, because the change can create an overload condition — and the level that was added to fit a taller container is exactly the level nobody recalculated. The answer is not to stop moving beams. It is to make the recalculation and the new plaque part of the change, the same way a drawing revision is.
For repair, reconfiguration and installation, a shutdown is the ideal window, and the work is planned against your calendar rather than ours. Inspection is the opposite case: damage is classified considering the rack loaded to the maximum stated on its plaques. Booking both into the same two weeks means the inspection measures an empty building, which is the one condition it is not meant to be judged in.
An engineer, and the guide says so in one of the few places it uses the word must: rack capacity must be determined by an engineer familiar with CSA A344. The inputs are your heaviest unit load rather than your average, how that load actually sits across the beams, the trucks that place it, and the seismic conditions of the site. A supplier's capacity chart is a starting point for a conversation, not an answer.
It matters, and it is completely normal. Used racking should have every component examined by a competent person, damaged or doubtfully compatible parts discarded, and its capacities determined so the permissible configurations can be set before it goes into service. Mixing new and used components from different manufacturers may also have consequences for their warranties. None of that is a reason not to buy used — it is a reason to know what you bought, which is a report rather than an invoice.
Related
Next step
Before the next changeover
A call with an advisor covers what you store, how often the layout moves, and what a recalculation cycle would look like against your shutdown calendar. If you would rather start with a number, the quote takes about ten minutes.