Rigging storage destroys more slings than lifting does. Most rigging is destroyed between lifts, not during them. A sling doing the job it was designed for, correctly rigged and within capacity, lasts a long time. The same sling thrown in the back of a truck, dragged through mud, left in the sun, or stored on a concrete floor next to the welding bay is being consumed by conditions that have nothing to do with lifting.
When we inventory a rigging locker for the first time, the damage pattern almost always points at storage rather than at use. That is encouraging, because storage is the cheapest thing in the entire program to fix.
Sunlight is a chemical attack in slow motion
Ultraviolet degradation is the most underrated failure mode in synthetic rigging, and the storage that causes it looks like reasonable housekeeping. Slings hung on a fence, draped over a job box, or left in an open truck bed are being degraded every hour of daylight.
The visible indicators come late: fading, a chalky or powdery surface, and stiffness. Meaningful strength loss occurs before those appear clearly, which means a sling can be substantially weakened while still looking serviceable to anyone who has not handled a new one recently.
Nylon and polyester both degrade under UV, and the degradation is cumulative and irreversible. There is no restoration — only removal. The relevant removal criteria are in the sling standards, and discoloration with stiffness is explicitly listed.
Moisture, and what it does to each material
Water alone does not destroy most rigging, but it enables everything that does.
- Wire rope corrodes internally where lubricant has washed out and moisture remains. The crown looks fine. The core deteriorates. This is the single most common finding on equipment stored outdoors, and it condemns rope that has never been overloaded.
- Chain corrodes at the link bearing points — exactly where wear is measured — and pitting creates stress concentrations that no amount of surface cleaning removes.
- Hardware corrodes at the threads, which is where it matters. A shackle pin that will not seat fully has lost its rating, and the crew’s response is usually to force it with a bar, adding mechanical damage to the corrosion.
- Synthetics are less affected by water directly, but wet slings stored wet grow mildew, and wet webbing picks up and holds contaminants it would otherwise shed.
Freezing adds a mechanical dimension. Wet synthetic slings that freeze become stiff and can suffer fiber damage from ice crystals within the weave, and a frozen sling flexed sharply is being damaged rather than warmed up.
The welding bay is the worst neighbor
Weld spatter destroys rigging in a way that is instantaneous, permanent, and easy to miss. A single spark on a nylon sling melts fibers. Spatter on chain is both mechanical damage and evidence of thermal exposure, and alloy chain loses strength permanently above roughly 400°F.
Storing rigging anywhere near hot work is the most common avoidable damage source in a shop. It is also the one most likely to produce a sling that fails inspection for a reason nobody can explain, because the exposure was brief and unobserved.
Physical separation is the entire fix: rigging storage out of the line of sight of any welding or cutting operation, or screened from it. In production environments where hot work is continuous, dedicated enclosed storage is not a luxury.
The concrete floor problem
Rigging stored on the floor gets stepped on, driven over, dragged, and soaked by whatever runs across the slab. Forklift traffic crushes and abrades. Floor washing introduces detergents and chemicals. And concrete itself is abrasive and alkaline, which matters for polyester.
Hanging is the correct storage for nearly everything. Slings on racks, chain on hooks, hardware in bins off the ground. The rack costs very little, and it converts a category of damage into a category that does not occur.
Chemical exposure without a chemical operation
Chemical damage does not require a chemical plant. Battery acid in a maintenance area, concrete and mortar residue, cleaning solvents, fuel and hydraulic fluid, and de-icing salt all attack rigging.
The material matters: nylon is degraded by acids, polyester by alkalis and caustics. That opposition is why substituting one for the other without checking the environment is genuinely hazardous. And chemical degradation frequently produces no visible change until the sling is loaded — which means the correct response to a known exposure is removal rather than inspection.
Where slings work around process chemicals, exposure history should be treated as a removal criterion in its own right, recorded against the sling identifier.
Handling damage between the rack and the load
Some of the most consistent damage happens in the few minutes rigging spends being moved:
- Dragging. Pulling a sling across concrete, steel decking, or gravel abrades it faster than any lift.
- Throwing hardware. Shackles tossed into a bucket or dropped from height take nicks and gouges at the bearing surfaces.
- Knotting to shorten. A knot is a removal condition, and it happens because the correct shortening hardware was not on the truck.
- Pinching. Slings left under a set-down load get crushed, and crushing damage to webbing is permanent.
- Mixed-material piles. Chain stored on top of webbing damages the webbing every time someone reaches into the pile.
None of these require training to prevent. They require somewhere to put things.
What good rigging storage looks like
The specification is unremarkable and cheap:
- Indoors, or in a closed container — out of direct sunlight and weather.
- Dry, with air movement. Slings put away wet should be dried first.
- Hung, not piled — racks for synthetics, hooks for chain, bins for hardware.
- Away from hot work, chemicals, and traffic lanes.
- Sorted by type and capacity, so the right sling is easier to grab than the wrong one.
- Segregated quarantine area for anything pending inspection or awaiting disposal.
- Moderate temperature, away from heaters and outside walls that freeze.
The quarantine problem
The most important item on that list is the last one people implement. A sling pulled from service and left in the locker returns to service — reliably, within weeks — because somebody needs a sling and there is one right there.
Two controls solve it. A physically separate quarantine location, and cutting condemned gear before it leaves your hand. Cut the eyes as well as the body so the remains cannot be repurposed. It takes five seconds and is the only removal method that survives a crew in a hurry.
Without both, the inspection produces a list rather than a result, and the same sling appears as a finding again next year.
Field storage is where programs actually fail
Shop storage is usually fixable in an afternoon. The harder problem is rigging that lives on trucks and in gang boxes on job sites, where there is no rack, no roof, and no obvious owner.
What works: a dedicated covered box on each truck rather than loose in the bed, hardware in closed containers rather than buckets, and a rule that rigging does not travel loose with tools and materials. On longer projects, a covered rack in the laydown area costs almost nothing and eliminates most of the UV and moisture exposure.
Field inventories also drift — gear gets borrowed, subcontractor slings mix with yours, and unidentified hardware accumulates. Segregating your controlled inventory from everything else is what keeps rigging with no identity from becoming your problem.
Storage is an inspection finding
A competent rigging inspection reports on where the gear lives, not only on its condition. If several slings show UV degradation, the finding is the storage location. If hardware shows thread corrosion, the finding is that it is stored wet. Replacing the gear without changing the conditions simply resets the clock.
That is why our rigging inspections include the storage assessment, and why the write-up separates damage from use out of damage from environment. The two have entirely different corrective actions, and conflating them produces a recurring expense rather than a fix. A structured inspection sheet that captures storage location alongside condition makes the pattern visible after two cycles.
Hardware and chain need different provision
Synthetic slings get most of the storage attention because their damage is visible. Chain and hardware degrade just as reliably and are stored worse, usually in buckets.
Chain slings should hang rather than pile. Piled chain damages itself and whatever is under it, and a heap of chain cannot be inspected without being laid out first — which means it does not get inspected. Hooks along a wall, one assembly per hook, makes the link-by-link examination possible and makes an overdue assembly visible.
Shackles and hardware belong in closed bins, sorted by size and capacity, off the ground. Loose hardware in an open bucket collects moisture, corrodes at the threads, and gets damaged by being tossed. It also guarantees mismatched pins, because the pin and body separate the moment they go into the bucket together with everything else — and a mismatched shackle assembly has no rated capacity at all.
Below-the-hook devices are frequently stored outdoors because they are large. Spreader beams and lifting devices corrode at their lifting points and pad eyes, which are precisely the load-bearing surfaces, and their marking plates fade until the rated capacity is unreadable.
Storage and the inventory register
Good storage and a working register reinforce each other. Sorted, hung, labeled storage makes an inventory count take minutes. A pile makes it take a day, which is why the count does not happen and the register goes stale.
The practical arrangement is to organize storage the way the register is organized — by type and capacity, with locations that match the identifiers. Colour-coded periodic inspection tags then become visible across the room, and an overdue item is obvious without opening a file. Facilities that get this right stop having the annual conversation about what happened to the gear that was condemned last year.
Where equipment moves between a shop and job sites, the register needs a location field and somebody who updates it. That is the least glamorous element of a rigging program and the one that determines whether the periodic inspection can actually find everything it is supposed to inspect.
Common questions
How should synthetic slings be stored?
Indoors or in a closed container, hung on a rack, dry, out of sunlight, away from hot work and chemicals, at moderate temperature. Never on the floor and never in an open truck bed.
Do slings have a shelf life?
No expiration date exists in the standards — condition governs. But a sling stored outdoors can be unfit within a single season without ever lifting anything, which is effectively a shelf life imposed by the storage.
Can a wet sling be used?
Wet is not itself a removal condition for most synthetics, though capacity considerations apply for some materials and temperatures. Frozen is different — a frozen sling should be thawed rather than flexed. The larger issue is storing wet, not using wet.
Does storage damage really matter compared to overload?
It is the more common cause. Overloads are memorable and infrequent. Storage degradation is continuous and unobserved, and it accounts for the majority of removals on a first inventory.
What about wire rope slings stored outdoors?
They corrode internally where lubricant washes out. The crown can look acceptable while the core deteriorates, and the criteria are in the rope standards. Lubrication practice matters far more on stored rope than on rope in daily use.
How do we stop condemned slings coming back?
Cut them, including the eyes, before they leave your hand, and maintain a physically separate quarantine area. Policy alone does not work.
Fix the rack before the inventory
Rigging programs that keep producing the same findings usually have a storage problem rather than a discipline problem. The gear is being destroyed between jobs, and each inspection cycle discovers the consequence rather than the cause.
If your removals keep repeating — UV damage, thread corrosion, weld spatter — a baseline inspection that includes the storage assessment will tell you which of those is environmental and give you a fix that costs a rack rather than an annual replacement budget.
Reviewed by Patrick Salazar, NCCCO-Certified Crane Inspector — every article on this site is checked against current OSHA and ASME B30 requirements before it publishes.
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