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30 Tonne Round Sling
A 30 tonne round sling is an endless polyester sling with a working load limit of 30,000 kg on one leg, hanging vertically. The core is a parallel bundle of high-tenacity polyester filament enclosed in a woven sleeve, closed into a loop with no ends, no stitching in the load path and no metal anywhere in it. Capacity comes from filament count rather than sleeve width, so a 30 t body stays slim enough to thread through a lifting eye that a 30 t shackle would never pass.
Two things decide whether this sling is the right one. The first is the arrangement – a 30 t rating is a single-leg vertical figure, and almost no 30 t lift is made that way. The second is the length, which on an endless sling can be quoted two ways that differ by a factor of two. Both are settled on this page before the price is.
1. What the 30 tonne figure means on site
The figure printed on the sleeve is the working load limit of one leg, hanging vertically. It is the number the sling is proof loaded and certified against, and it is the number a lifting plan starts from. It is not the number of tonnes the sling will pick up in the arrangement you are actually using.
Two adjustments turn the single-leg figure into a set figure, and both of them reduce it. The mode – vertical, choked, basket – changes how the body carries the load: a choke costs 20 %, a basket at a shallow angle nearly doubles the capacity. The leg angle changes how much of the load each leg sees: the wider the legs spread from the hook, the greater the tension in each one for the same load. And a multi-leg set is rated on fewer legs than it has, because a real load never sits perfectly symmetrically – four legs are calculated as three.
That is why two 30 t slings do not make a 60 t set. At 45 degrees apart they carry 42 t. Four of them carry 63 t, not 120 t. At this tonnage the arithmetic is where lifts are lost, and it costs nothing to get right before the order rather than after.
2. Set capacity at 30 t, configuration by configuration
The table applies the EN 1492-2 mode factors to the 30 t single-leg rating. Use the row that matches how the sling will actually be rigged, not the row that matches the load.
| Configuration | Factor | Capacity of the set |
|---|---|---|
| One sling, vertical | x 1.0 | 30 t |
| One sling, choked | x 0.8 | 24 t |
| One sling, basket at 0-7 degrees | x 2.0 | 60 t |
| One sling, basket at 7-45 degrees | x 1.4 | 42 t |
| One sling, basket at 45-60 degrees | x 1.0 | 30 t |
| Two slings, 0-45 degrees from vertical | x 1.4 | 42 t |
| Two slings, 45-60 degrees from vertical | x 1.0 | 30 t |
| Four slings, 0-45 degrees from vertical | x 2.1 | 63 t |
| Four slings, 45-60 degrees from vertical | x 1.5 | 45 t |
Read the table from the load backwards. A 55 t load on two legs needs 40 t slings at 0-45 degrees (1.4 x 40 = 56 t) and 60 t slings beyond it; a 60 t load on four legs is inside the 63 t a 30 t set carries at 0-45 degrees, and out of scope once the legs pass 45 degrees. If the load needs 30 t slings in the first place, it usually needs the next size up once the legs open – the 40 tonne round sling is the next step, and a spreader beam is often cheaper than a bigger set.
3. Construction: the core carries, the sleeve decides how long
The load path is a parallel bundle of high-tenacity polyester filament, waxed and laid without twist. Every filament shares the load, which is why the body can be long and thin and still rate at 30 t. Nothing in that bundle is designed to be seen, so the sleeve is what you inspect, what you read and what protects the core from grit, daylight and abrasion.
A single woven polyester sleeve is standard. A double sleeve round sling adds a second wear layer between the load and the core at the same 30 t rating – worth the money in precast yards, on rebar and in rental fleets, and pointless on a clean indoor lift where the sleeve is never touched by anything harder than paint.
Handling matters more at 30 t than at 3 t. A 30 t sling is a heavy, bulky object: coil it on a stillage, move it with the forklift, and never drag it across the yard. Most of the wear these slings see happens before they are ever rigged, and a dragged sleeve is a worn sleeve.
4. Technical parameters
The figures below are the standard specification. Sleeve, length, colour, marking and packing are made to order, so treat the table as the basis of a quotation rather than a fixed catalogue entry. Body diameter and unit mass follow the length and the sleeve option, and are shown on the drawing issued with the quotation.
| Parameter | Specification |
|---|---|
| Product | WLL 30T polyester round sling – endless round sling, 30,000 kg round lifting sling |
| Construction | Continuous parallel filament core in a woven tubular sleeve, closed into an endless loop; no metal in the load path |
| Core | High-tenacity polyester (PES) multifilament, parallel lay, waxed |
| Sleeve | Woven high-tenacity polyester, single layer standard; double sleeve to order |
| Working load limit | 30,000 kg (30 t), single leg, vertical |
| Breaking load | 210,000 kg at a 7:1 factor |
| Safety factor | 7:1 as standard; other factors to order where the market requires |
| Elongation at WLL | Approximately 2 – 3 % |
| Service temperature | -40 C to +100 C |
| Effective length | 1 – 30 m made to order; longer bodies quoted individually |
| Colour | Orange as standard; other sleeve colours to order |
| Marking | WLL and length printed on the sleeve; sewn label with WLL, length, serial, standard and date |
| Standard | EN 1492-2 and ASME B30.9 construction practice |
| Testing | Proof loaded before dispatch; test record matched to the serial number |
| Packing | Coil in a poly bag, labelled carton; pallet or crate on request |
| MOQ and OEM | Low MOQ for a trial order; OEM on length, sleeve colour, core fibre, label layout and packing |
5. Length: effective length or circumference
An endless sling has no ends, so its length can be quoted two ways, and the two are a factor of two apart. This is the most common ordering error on a round sling, and at 30 t it is an expensive one to correct after the event.
| Quoted as | You receive | Used for |
|---|---|---|
| Effective working length | Half the circumference – hook down to the load and back up | Vertical and choked lifts, where the hanging height is known |
| Circumference | The full loop length | Basket lifts, where the girth of the load drives the length |
A 4 m effective length is an 8 m loop. On the slings we supply, the figure printed on the sleeve is the effective length – so the print and the quotation always agree. For a basket lift, take the girth of the load, add the headroom to the hook, and quote that figure: the body takes the long way round the load, not the short one, and a sling that only just reaches forces the legs wide, which is the same as buying a smaller sling.
6. Marking, serial number and proof-load traceability
Above 10 t the colour code no longer identifies the sling, so at 30 t the print and the label are the only things the person making the lift can read. Both are part of the specification rather than decoration.
- The working load limit and the effective length are printed directly on the sleeve in characters sized to be read at arm’s length in a yard.
- A sewn label carries the WLL, length, serial number, standard and date of manufacture – the serial is what links the physical sling to its paperwork.
- Each sling is proof loaded before dispatch and the test record is matched to that serial number, so the certificate in the folder belongs to the sling in the crate.
- A fibre certificate and batch figures are available on request; if your market requires a specific standard marking on the label, tell us before the order rather than after.
- Sleeve colour remains useful for fleet identification even where it no longer encodes capacity – OEM colours are quoted per order.
7. Where a 30 tonne round sling earns its place
At this capacity the sling is usually chosen for what it does not do to the load, not for what it can carry – a wire rope grommet carries the same figure. The difference is contact.
| Application | What the sling does |
|---|---|
| Precast beams and bridge segments | A segment picked at each end in a basket: the sleeve protects the formed face and the chamfer, and the body wraps the lifting loop instead of cutting into it |
| Steel coils at 25 – 30 t | The coil sits in a basket, where the doubled body gives 60 t of basket capacity and the sling follows the curve of the coil rather than bearing on a single line |
| Transformers, generators and machine beds | Trunnions and lifting holes are small and the surfaces are painted or machined – nothing metal touches the load and nothing has to be matched to a hook |
| Moulds and dies | Lifting holes are drilled, not designed for a fitting, so a soft loop threaded through the hole is the entire method |
| Skids, frames and offshore baskets | Six to twelve metre bodies choked at each corner; the sleeve takes the corner abrasion so the core does not |
| Contractor and rental fleets | 30 t covers the gap between a 20 t set and a 50 t lift, which is why it is the size most often held in stock |
8. 30 t round sling against wire rope and chain
| Criterion | Polyester round sling | Wire rope grommet | Four-leg chain set |
|---|---|---|---|
| Weight for the rating | Lightest of the three; carried to the machine by hand | Heavier, and stiff to handle | Heaviest, and awkward in a confined lift |
| Contact with the load | Soft and conforming; will not mark paint or machined faces | Steel on steel; marks finished surfaces | Hard contact; dents and edge marks |
| Sharp edges | A limit – needs a protector | Tolerates edges better | Tolerates edges |
| Heat | To +100 C; hotter loads need a high temperature round sling | Higher | Highest |
| Inspection | Sleeve first, then label; wear is visible from outside | Internal wire breaks are hard to see in a grommet | Link by link |
| Where it wins | Precast, coils, machine beds, moulds, tight access | Rough, abrasive and hot work | Foundry and repeated heavy abuse |
All three carry 30 t. The choice is made on the surface of the load, the temperature and how the sling will be inspected – not on capacity. Where the load is abrasive rather than delicate, wire rope slings are the more economical answer over a service life.
9. Different cores for different duties
The 30 t body is a platform. The core and the sleeve change with the duty, and the rating can stay the same while the weight, the temperature limit and the price move.
- Polyester (standard). The general-purpose core: low stretch, good abrasion life, -40 C to +100 C, and the lowest cost of the three at this rating.
- UHMWPE round sling core. Where the sling’s own weight is the problem – long bodies, high picks, or a sling that has to be carried up a ladder.
- Aramid round sling core. Where the load is hot or the sling works close to a heat source and a polyester core would be degraded.
- Adjacent designs. The round sling with eyes fixes a defined length and two pick-up points; the heavy duty round sling range covers 50 t and above; and a flat webbing sling gives the same rating in a thinner profile where there is no room for a round body.
10. Inspection, care and retirement
The core cannot be inspected directly, so the sleeve is the window: what the sleeve shows is what the core has been through. Inspect before every use, and formally at the interval your regime requires.
- Check the sleeve along its full length for cuts, snags, glazing, melts and chemical staining, and open the sleeve where it is stitched to look at the core if anything looks wrong.
- Read the label and the print: if the WLL or the length can no longer be read, the sling cannot be verified for a lift and should be withdrawn.
- Feel for grit inside the sleeve – it abrades the core from within long after the yard has been swept.
- Check the stitching at the join and the condition of any protector sleeve; a failed stitch is a retirement item, not a repair.
- Retire on any of: a cut or hole in the sleeve that exposes the core, glazing from heat, a core that has gone stiff or lumpy, chemical attack, or a missing label.
- Store coiled and off the floor, out of daylight and away from heat, solvents and weld spatter; never store a sling wet in a closed bag.
- Never exceed the rating, never lift on a damaged sleeve, and never use a sling whose history is unknown.
11. How to specify a 30 tonne round sling
Six pieces of information settle capacity, length and sleeve. The two most often missing are the arrangement and the length convention, and both of them change the number we quote.
| Information | Why it matters |
|---|---|
| Load per lift, and per leg if known | Sets the rating; the single-leg figure is only the starting point |
| Arrangement | Vertical, choked or basket, and the angle from vertical – this applies the mode factor |
| Distance between pick-up points | With the headroom, this fixes the leg angle and therefore the length |
| Length convention | Effective length or circumference – a factor of two apart on an endless sling |
| Sleeve and environment | Single or double sleeve; temperature, chemicals, abrasion and edges |
| Marking and documentation | Standard marking, own-brand label, proof-load record and packing requirements |
12. Frequently asked questions
How much can a 30 tonne round sling lift in a basket or a choke?
The sleeve gives 30 t vertical. Choked it is 24 t. In a basket it is 60 t at 0-7 degrees, 42 t at 7-45 degrees and 30 t at 45-60 degrees. The arrangement is part of the rating, not a detail of how it is rigged.
Can I lift 60 tonnes with two 30 tonne round slings?
Not safely. Two legs at 0-45 degrees from vertical carry 42 t, and 30 t at 45-60 degrees. For a 60 t load on two legs, step up to 50 t slings at 0-45 degrees and 60 t slings beyond 45 degrees, or go to the next size in the 40 tonne round sling range.
What length do I order – 4 m or 8 m?
Say which convention you mean. A 4 m effective length is an 8 m loop. For a vertical or choked lift the effective length is the distance from the hook to the load; for a basket, add the girth of the load to the headroom and quote that.
Is a 30 t round sling available in UHMWPE or aramid?
Yes. The same body is built with a UHMWPE core where the sling’s own weight matters, and with an aramid core or a heat-resistant sleeve for hot loads. Capacity, length and marking conventions stay the same.
How much does a 30 tonne round sling weigh?
Body diameter and unit mass follow the length and the sleeve option, so they are shown on the drawing issued with the quotation rather than fixed in a table. As a rule, a 30 t body is heavy enough that it is carried by two people or moved on a stillage.
What documentation comes with the sling?
A sewn label carrying the working load limit, length and serial; a proof-load record matched to that serial; a fibre certificate and batch figures on request. Tell us before the order if your market needs a specific standard marking.
What is the working temperature range?
Minus 40 to plus 100 degrees C for a standard polyester sling. Above that the polyester core degrades, and the answer is an aramid core or a high-temperature sleeve rather than a thicker standard sling.
How is the sling tested?
Every sling is proof loaded before dispatch and the record is matched to its serial number. The 7:1 factor is the ratio of the 210,000 kg breaking load to the 30,000 kg working load limit, and it can be varied to order where a market requires a different factor.
13. Why buy 30 tonne round slings from Lift
We have been making lifting equipment in Taizhou, Jiangsu since 1985, with rope, webbing and sling production on one site. The core, the sleeve, the stitching and the proof load are all under our control, which is why a 30 t sling to a specific length is a production order rather than a special project.
- Rated and marked for the arrangement. The single-leg figure is printed on the sleeve, the serial on the label, and the arrangement is confirmed in writing with the quotation.
- Proof loaded per sling. A test record matched to the serial travels with the order, with CE, GS, JIS, CNAS and DNV certification behind the range – see certification.
- One supplier for the whole lift. All round slings from 1 t to 1000 t, lifting beams for multi-leg sets, and the wider lifting devices range.
- OEM and ODM. Sleeve colour, printed marking, label layout and packing to your brand, with a sample for trial before volume production.
14. Request a 30 t round sling quotation
Send the load per leg, the arrangement and angle, the distance between pick-up points and the headroom to the hook. We will confirm capacity, length and sleeve, and quote factory-direct with a drawing, a proof-load certificate and a sample sling. Contact our engineers with your lift details.
Lift Sling Rigging Co., Ltd – Lifute Industrial Park, Taizhou, Jiangsu, China
Tel: +86 523 8693 5818 | WhatsApp: +86 180 6600 2268 | E-mail: 702461526@qq.com
HS code 630790 – lifting slings of textile materials.