Lift sling rigging company produce One-Way Webbing Sling,One Way Endless Webbing Slings,Polyester Single Trip One Way endless webbing slings.
One Way Webbing Sling
A one way webbing sling is a rated polyester sling bought for one journey: it is fitted to the load, travels with it and is written off against that job instead of being returned to a sling store. This page covers the closed begalinė kilpa form — the shape specified for pipe, tube and bundling work, because a loop wraps a cylinder instead of hooking it. Standartinis diapazonas: 1 t į 12 t, juostos plotis 25 mm iki 300 mm, saugos faktorius 5:1, 6:1 arba 7:1, kilpos ilgis 0.5 m iki 100 m, marked to BS EN 1492-1.
On this page
What “one way” decides, ir ko nedaro
The phrase describes the commercial life of the article, not its quality. A one way sling is manufactured, įkeltas įrodymas, colour coded and labelled to the same standard as a sling that will be inspected for years; the difference is that it leaves the store once and does not come back.
Three practical consequences follow. It is issued with the load, so it becomes a line on the packing list rather than an item in a sling register. It is inspected once, išdavimo vietoje, while a fault can still be replaced from the same consignment. And its print is its whole record: darbinės apkrovos riba, ilgio, factor and batch are the only traceability the band will ever carry, so the marking has to survive a lorry, a container and a loading bay — not just the production line.
Tai, ko tai nesikeičia, yra inžinerija. A narrow band or a lower factor chosen because “it is only going one way” is not a saving; it is an unrated margin taken out of the lift. The figure that applies is the figure printed on the band, for the arrangement actually used. Buyers who need the returnable version of the same loop should read the vieno sluoksnio begalinis plokščias diržas page instead.
Why a closed loop is the right form for pipe, tube and bundles
An endless webbing sling is a band joined to itself. There is no eye to line up against a machined pipe end, no stitching stack at the bearing point and no shackle, hook or thimble anywhere on the article. On round loads that single property does most of the work.
- It cannot mark a coating. Galvanising, fusion bonded epoxy, three layer PE and paint are all damaged by the same things: a steel edge, a sliding hook and point pressure. A woven polyester face addresses all three. Nothing metallic contacts the pipe, and the load never slides against a fitting.
- The choke holds itself. Passed round the pipe and back through the loop, the band tightens as the load rises. On a cylinder the contact line is a full wrap rather than two point contacts, which is why a loop resists slipping along the axis and does not walk towards the pipe end during a pick.
- The load stays centred. Because the band wraps symmetrically, the pick point sits over the centre of gravity of a joint or bundle rather than off one side — the usual cause of a tilted, eccentric lift and of one sling taking more than its share.
- Pressure is spread by width. Thin wall PVC, PE and stainless tube dent under a narrow band. A 100–200 mm face turns a point load into a low pressure band, which is the single most effective protection on a soft or thin walled pipe.
- Nothing to lose and nothing to thread. A band with end fittings can arrive with the fittings gone. A loop is one piece of webbing: it is either there or it is not, and the person re-slinging at the far end needs no rigging plan to use it.
Where a one way webbing sling is used
The loop is chosen where the load is wrapped rather than hooked, and where the surface matters as much as the tonnage. On a joint lifted on its own, one loop goes round the pipe near each end and the two legs meet at the hook; on a bundle, one loop per pick position is choked round the pack. The applications below are the ones this range is most often bought for, and each one puts a different line on the enquiry.
| Įkelti | Why the loop suits it | What to state on the order |
|---|---|---|
| Plieninis vamzdis ir vamzdis, single joints or bundles | A round section is wrapped, not hooked; the choke grips and the band cannot slide along the pipe. | Outside diameter, wall, joint mass or bundle mass, spacing of the two pick positions. |
| PVC ir PE vamzdis | Thin walls dent under point pressure; a wide soft face spreads the load and leaves no witness mark. | Skersmuo, wall thickness, mass per joint, whether a surface mark is a rejection. |
| Anti-corrosion pipe (3PE, FBE, tape wrap) | No metal and no sliding contact, so the coating survives the lift and the inspection at destination. | Coating type, whether coated ends are handled, and any requirement for a sleeve. |
| Stainless and copper tube | Minkštas, expensive and unforgiving of a burr; a polyester face is softer than the load. | Baigti (malūnas, polished), vamzdžio skersmuo, girth at each pick. |
| Rebar bundles and steel mesh | Cut wire and mesh edges attack a narrow band; a wide loop carries the bundle and resists abrasion. | Bundle mass, number of ties per bundle, whether edge sleeves are needed. |
| Profiles, sections and sheet packs | A sharp arris is a blade against webbing; width and edge protection decide the life of the band. | Skyrius, stack height, edge condition, band direction. |
| Rąstai, timber and timber packs | The arris prints into dressed stock and cuts the weave on a narrow band; a loop spreads the pressure. | Pack mass as it travels, girth at the picks, whether a compression mark matters. |
| Machinery and painted assemblies | Nothing metallic touches the load at either end, which on a painted or ground surface is the reason to buy it. | Mišios, svorio centras, lifting points, surface finish. |
Specifications of the one way webbing sling
The figures below describe the standard build. Width is not a free choice: it follows from the working load limit and from the safety factor, so the same tonnage appears at three widths. Kilpos ilgis, sluoksniuoti, colour and print are made to the order.
| Produktas | One way webbing sling, begalinė kilpa (apskritas) forma; also supplied with formed eyes as a disposable webbing sling one eye |
|---|---|
| Forma | Uždara kilpa, plokščias austas, band joined to itself — no eye, no end, no metal fitting |
| Sukurti | Single ply standard; double ply for a higher figure at the same width or a stiffer bearing face |
| Pluoštas | High tenacity polyester webbing (PES); nailono (PA) for shock loads and polypropylene on request |
| Web thickness | 4 mm standartas (3–10 mm across the range) |
| Darbinės apkrovos riba | 1 t – 12 t single ply; 2 t – 24 t dvigubo sluoksnio |
| Juostos plotis | 25 mm – 300 mm, set by the working load limit and the safety factor |
| Saugumo faktorius | 5:1 / 6:1 / 7:1, selected at order |
| Kilpos ilgis | 0.5 m – 100 m in one continuous loop; minimum length rises with width |
| Pailgėjimas | ≤ 7 % esant darbo apkrovos ribai (poliesteris) |
| Darbinė temperatūra | -40 °C iki +100 °C nuolatinis; polyester melts at about 258 °C, so sparks and hot work need a sleeve |
| Spalva | BS EN 1492-1 capacity colour — 1 t violetinė, 2 t žalia, 3 t geltona, 4 t pilka, 5 t raudona, 6 t ruda, 8 t mėlyna, 10 t oranžinė; special colours and printed logos on OEM orders |
| Etiketė | Darbinės apkrovos riba, kilpos ilgis, saugos faktorius, partijos numeris, customer reference; blue or white label |
| Standartai | BS EN 1492-1; ASME B30.9 for the 5:1 statyti; other market standards to order |
| Pakavimas | Bundled, cartoned or palletised, labelled per pack and listed on the packing list against the printed reference |
| HS kodas | 630790 |
Choosing the size: the figure from the pick, the width from the surface
Two decisions are made separately and in this order. The darbinės apkrovos riba comes from what one pick has to carry, divided by the mode factor of the hitch — not from the mass of the load as weighed. The plotis then comes from the surface being wrapped: a coated pipe and a painted machine at the same tonnage do not want the same band.
| Load at one pick | Darbinės apkrovos riba | Plotis (5:1 / 7:1) | Tipiškas naudojimas |
|---|---|---|---|
| Iki 0.8 t | 1 t | 25 / 30 mm | Small bore tube, single light sections, tooling |
| 0.8 – 1.6 t | 2 t | 50 / 60 mm | Pipe to 6″ in single joints, small bundles |
| 1.6 – 2.4 t | 3 t | 75 / 90 mm | Pipe to 10″, rebar bundles, medienos paketai |
| 2.4 – 3.2 t | 4 t | 100 / 120 mm | Coated pipe 12–16″, sheet packs |
| 3.2 – 4.0 t | 5 t | 125 / 150 mm | Heavy wall pipe, mašinos, akmuo |
| 4.0 – 4.8 t | 6 t | 150 / 180 mm | Vamzdžių ryšuliai, structural sections |
| 4.8 – 6.4 t | 8 t | 200 / 240 mm | Large bundles, ritės, log packs |
| 6.4 – 8.0 t | 10 t | 250 / 300 mm | Export pipe bundles, heavy fabricated items |
| 8.0 – 9.6 t | 12 t | 300 / 300 mm | Maximum single ply; go to double ply above this |
Ilgis: the two conventions, and why the mistake is expensive here
A loop has no ends to measure between, so the trade quotes the same article two ways. The two figures differ by about a factor of two, and on a one trip band the error surfaces at the far end — in front of a customer, with no second band to swap in.
| You write | It means | When to use it |
|---|---|---|
| Kilpos perimetras 4.0 m | One full turn round the load, measured round the closed loop | The band is ordered to wrap a known girth |
| Band length 2.0 m, laid flat | The webbing cut length before joining — half the circumference | The band is priced and cut by the metre |
| Girth at the pick 1.6 m, two picks | The dimension of the load itself, plus the number of bands | Safest form on a first order: it needs no convention at all |
What the same loop carries in each hitch
The figure on the label describes the vertical arrangement only. All three hitches are rigged without any change to the article, which is why the arrangement has to be stated before the width is fixed.
| Sutvarkymas | veiksnys | A 5 t loop gives | Kur jis naudojamas |
|---|---|---|---|
| Vertical — loop hangs, load on one side | 1.0 | 5.0 t | Single point pick, hook through the loop |
| Choked — round the load and back through itself | 0.8 | 4.0 t | Vamzdis, vamzdis, stulpai, būgnai, ryšulių |
| Krepšelis, kojos 0-45° | 2.0 | 10.0 t | Under a bundle with both legs carrying |
| Krepšelis, kojos 45-60° | 1.4 | 7.0 t | Wide bundles, short sling legs |
The choke is the arrangement a loop is bought for, and it is also the one that costs 20 % of the printed figure. A 4.5 t pipe bundle choked on a 5 t loop is an overload, not a margin — the answer is the next width up, not a longer band.
Coating and surface compatibility
| Paviršius | Risk in the lift | Sling measure |
|---|---|---|
| Hot dip galvanised pipe | Zinc layer rubbed through by sliding hardware; white rust at a scored line | Begalinė kilpa, nėra armatūros, 100 mm band or wider, dry and grit free |
| 3PE / FBE anti-corrosion pipe | Point pressure and edge cuts at the coating; repairs are costly at destination | Wide soft face, padded protector at the contact, choke without a wire rope stinger |
| PVC ir PE vamzdis | Denting and ovality under a narrow band, especially in warm weather | 150–200 mm band, two picks, basket rather than a single choke on long joints |
| Stainless tube | Iron contamination and scratching from contact with steel fittings | Dedicated synthetic sling, nėra metalinio kontakto, clean storage before issue |
| Copper tube | Brinelling and burrs from hard contact | Loop only, band width matched to tube diameter |
| Painted or machined assemblies | Print-through and paint damage at the sling contact | Soft loop, edge sleeves, protector where the band crosses an arris |
Žymėjimas, label and what it has to survive
On a single trip article the print is the record, so the marking is a specification line rather than a detail. Four things belong on the label: darbo apkrovos riba, the loop length with its convention, saugos faktorius, and the reference the despatch actually uses — a batch, pakuotės numeris, užsakymo numerį arba savo dalies numerį. That reference is what ties the band on a quay to the line on a packing list in an office.
- Įskaitoma po kelionės, ne po gamybos. Small, low contrast print on a face that enters the choke will not be read at the far end.
- Spalva kaip antrasis kanalas. One colour per pack type, per customer or per tonnage lets a container of identical bands be sorted at a glance.
- Printed to your string. The label can carry your reference in the exact case and format you send, o juostas galima supakuoti į dėžę, strapped to a stillage or taped into a bundle, labelled per pack.
The single inspection, and what it looks at
A one trip band is checked once, klausimu, while a fault can still be replaced from the same consignment. Look at four things, tokia tvarka: the weave where it meets the load (pjūviai, dilimas, a glazed or pinched face), the join where the loop closes, the label — an unreadable figure cannot be matched to the pack it was cut for — and what the band has been lying in. Grit, skeveldra, oil and standing water travel into the contact, and a clean band is the cheapest protection available.
Do
- State the hitch, the girth and the mass per pick
- Add edge protection at a cut sheet, mesh or arris
- Keep the band dry, clean and off the ground before issue
- Retire the band at the destination, not back to a rack
Do not
- Shorten a sling with a knot or join two by knotting
- Repair webbing by stitching, suvirinimas ar šildymas
- Drag a loop over a cut edge or across the ground
- Re-issue a band that has done a journey
Protect the band from sharp edges, hot surfaces and welding spatter with a sleeve or a padded protector. Aukščiau 100 °C, or where sparks are present, polyester is the wrong fibre and an begalinis apvalus stropas with a heat resistant cover is the article to discuss.
One way or returnable: the arithmetic
The commercial case is simple and it is arithmetic, not preference. A one way band costs less per unit than a returnable sling and carries no return freight, no inspection register, no repair and no loss write-off — but it has to be counted correctly, because nothing comes back to cover a shortfall. Count from the pack, ne nuo tonažo: two picks per pack is two bands, a four point lift is four, ninety packs at two picks is 180 juostos. Add two to five per cent for the band cut while the pack is made up, so a shortfall becomes a line on the order instead of a delay at the dock.
Where the same slings are used week after week in one yard, a returnable article inspected between lifts is the cheaper order over a year. Where the sling leaves with the load — export packing, one off shipments, work that ends on a customer’s site, or a coated pipe consignment that is re-slung at the far end — the one way loop is the right purchase. Where the whole consignment travels as a netted unit instead of being slung joint by joint, a krovinio kėlimo tinklas is the article to price against it. The form with eyes at both ends, for loads that are hooked rather than wrapped, yra ant disposable one way sling puslapį; the wider family is on the vienkartiniai stropai ir single use lifting slings endless loop puslapių.
What to send with the enquiry
Six lines are enough to quote a made to order band, and they remove every ambiguity that shows up later at the load:
- The load — pipe diameter and wall, bundle mass, or the finished item.
- The pick positions — how many, and how far apart.
- The arrangement — vertical, užspringęs ar krepšelis, and the angle if basket.
- The girth at each pick, or the loop length with its convention named.
- The safety factor your market works to, and the standard to mark to.
- The reference to print, and the quantity per pack.
Request a quotation for one way webbing slings
Siųsti krovinį, rinkimo pozicijas, the girth and the factor. Grįžtame su pločiu, the loop length, the finished weight and the marking — on a drawing, before the band is cut.
Send your sling specification · Telephone / WeChat +86 180 6600 2268 · 702461526@qq.com
Lifutės pramonės parkas, Taidžou miestas, Dziangsu provincija, China · HS code 630790
Dažnai užduodami klausimai
What is a one way webbing sling?
A rated polyester webbing sling supplied for a single journey. Važiuoja su kroviniu, is inspected once at the point of issue and is not recovered or re-issued. The endless form is a closed loop of flat woven polyester with no eye and no metal fitting, which is why it is the form chosen for pipe, tube and bundles.
Is a one way sling weaker than a reusable one?
Nr. Pluoštas, pynimas, plotis, saugos faktorius, working load limit and marking are specified exactly as for a returnable sling. Žodis apibūdina kelionę, ne pažymys, so a lower factor or a narrower band is not a saving on a single trip article.
Will a webbing sling scratch galvanised or anti-corrosion pipe?
The band is synthetic fibre and no shackle, hook or thimble touches the load when an endless loop is used, so there is nothing to cut or gouge a zinc, epoxy or polyethylene coating. Plotis yra apsaugos priemonė: kuo platesnė juosta, the lower the pressure at the contact.
How is the length of an endless webbing sling measured?
Two conventions are used and they differ by about a factor of two: the circumference of the closed loop, and the length of the band laid flat before joining. Name the convention with the figure, or give the girth of the pipe or bundle the loop must go round.
Can the same loop be used in a choker hitch?
Taip, and a closed loop is the natural form for a choke on pipe, tube and bundles. Užspringusi figūra yra 0.8 of the vertical working load limit, taigi a 5 t loop chokes 4 t. Select the width for the arrangement actually used.
Which safety factor should I order, 5:1, 6:1 arba 7:1?
7:1 is the usual European figure for flat woven webbing slings to BS EN 1492-1, 5:1 is the customary North American figure under ASME B30.9, ir 6:1 sėdi tarp jų. The same tonnage at a different factor is a different article with a different width, taigi veiksnys priklauso užklausai.
Ar juosta gali būti atspausdinta su mūsų nuoroda?
Taip. Darbinės apkrovos riba, kilpos ilgis, saugos faktorius, batch and your own pack, order or part number can be printed as produced, in the exact string you send, so a band at the far end can be tied back to a line on the packing list.