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 ib txoj kev 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 tsis kawg voj form — the shape specified for pipe, tube and bundling work, because a loop wraps a cylinder instead of hooking it. Txheem ntau yam: 1 t rau 12 t, band dav 25 mm rau 300 mm, yam kev nyab xeeb 5:1, 6:1 los yog 7:1, loop length 0.5 m rau 100 m, marked to BS EN 1492-1.
On this page
What “one way” decides, thiab dab tsi nws tsis
The phrase describes the commercial life of the article, not its quality. A one way sling is manufactured, pov thawj loaded, 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. Nws yog issued with the load, so it becomes a line on the packing list rather than an item in a sling register. Nws yog inspected once, at the point of issue, while a fault can still be replaced from the same consignment. And its print is its whole record: ua hauj lwm load txwv, ntev, 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.
What it does not change is the engineering. A narrow band or a lower factor chosen because “it is only going one way” is not a saving; nws yog ib tug unrated margin tshem tawm ntawm lub nqa. 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 ib leeg ply endless flat sling 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.
| Thauj khoom | Why the loop suits it | What to state on the order |
|---|---|---|
| Hlau yeeb nkab thiab lub raj, single joints or bundles | A round section is wrapped, not hooked; the choke grips and the band cannot slide along the pipe. | Sab nraud txoj kab uas hla, phab ntsa, joint mass or bundle mass, spacing of the two pick positions. |
| PVC thiab PE yeeb nkab | Thin walls dent under point pressure; a wide soft face spreads the load and leaves no witness mark. | Txoj kab uas hla, 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 | Mos, kim thiab unforgiving ntawm ib tug burr; a polyester face is softer than the load. | Ua kom tiav (zeb, polished), cev diam, 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. | Tshooj, pawg qhov siab, ntug mob, band direction. |
| Cov log, 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. | Pawg, qhov chaw ntawm lub ntiajteb txawj nqus, 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. Loop length, ply, colour and print are made to the order.
| Khoom | One way webbing sling, tsis kawg voj (ncig) daim ntawv; also supplied with formed eyes as a disposable webbing sling one eye |
|---|---|
| Daim ntawv | Closed loop, tiaj woven, band joined to itself — no eye, no end, no metal fitting |
| Tsim | Single ply standard; double ply for a higher figure at the same width or a stiffer bearing face |
| Fiber ntau | High tenacity polyester webbing (PES); nylon (PA) for shock loads and polypropylene on request |
| Web thickness | 4 mm txheem (3–10 mm across the range) |
| Ua hauj lwm load txwv | 1 t- 12 t single ply; 2 t- 24 t ob ply |
| Band dav | 25 mm - 300 mm, set by the working load limit and the safety factor |
| Kev nyab xeeb yam | 5:1 / 6:1 / 7:1, selected at order |
| Loop length | 0.5 m - 100 m in one continuous loop; minimum length rises with width |
| Elongation | ≤ 7 % ntawm qhov ua haujlwm load txwv (polyester) |
| Ua haujlwm kub | -40 ° C rau +100 °C tsis tu ncua; polyester melts at about 258 °C, so sparks and hot work need a sleeve |
| Xim | BS EN 1492-1 capacity colour — 1 t violet, 2 t ntsuab, 3 t daj, 4 t siv, 5 t liab, 6 t xim av, 8 t xiav, 10 t txiv kab ntxwv; special colours and printed logos on OEM orders |
| Daim ntawv lo | Ua hauj lwm load txwv, loop length, yam kev nyab xeeb, batch naj npawb, customer reference; blue or white label |
| Cov qauv | BS EN 1492-1; ASME B30.9 for the 5:1 build; other market standards to order |
| Ntim | Bundled, cartoned or palletised, labelled per pack and listed on the packing list against the printed reference |
| HS code | 630790 |
Choosing the size: the figure from the pick, the width from the surface
Two decisions are made separately and in this order. Cov ua hauj lwm load txwv 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. Cov dav 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 | Ua hauj lwm load txwv | Dav (5:1 / 7:1) | Hom kev siv |
|---|---|---|---|
| Mus txog 0.8 t | 1 t | 25 / 30 mm | Lub cev me me, 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, ntoo pob |
| 2.4 - 3.2 t | 4 t | 100 / 120 mm | Coated pipe 12–16″, daim ntawv pob |
| 3.2 - 4.0 t | 5 t | 125 / 150 mm | Heavy wall pipe, tshuab, pob zeb |
| 4.0 - 4.8 t | 6 t | 150 / 180 mm | Pipe bundles, structural sections |
| 4.8 - 6.4 t | 8 t | 200 / 240 mm | Large bundles, coils, 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 |
Ntev: the two conventions, and why the mistake is expensive here
Lub voj tsis muaj qhov xaus los ntsuas nruab nrab, 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 |
|---|---|---|
| Loop ncig 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.
| Kev npaj | Qhov xwm txheej | A 5 t loop gives | Qhov twg yog siv |
|---|---|---|---|
| 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 | Yeeb, cev, poles, nruas, pob |
| Pob tawb, ob txhais ceg 0-45 ° | 2.0 | 10.0 t | Under a bundle with both legs carrying |
| Pob tawb, ob txhais ceg 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
| Nto | Risk in the lift | Sling measure |
|---|---|---|
| Hot dip galvanised pipe | Zinc layer rubbed through by sliding hardware; white rust at a scored line | Tsis kawg voj, tsis muaj fittings, 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 thiab PE yeeb nkab | 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, tsis muaj kev sib cuag hlau, huv si cia ua ntej qhov teeb meem |
| 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 | Lub voj voog mos, edge sleeves, protector where the band crosses an arris |
Kos npe, 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: ua hauj lwm load txwv, the loop length with its convention, yam kev nyab xeeb, and the reference the despatch actually uses — a batch, ib pob tooj, tus lej xaj lossis koj tus lej lej. That reference is what ties the band on a quay to the line on a packing list in an office.
- Pom zoo tom qab taug kev, tsis tom qab ntau lawm. Small, low contrast print on a face that enters the choke will not be read at the far end.
- Xim raws li qhov thib ob channel. Ib xim rau ib hom pob, 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, thiab cov hlua tuaj yeem ntim rau hauv ib lub thawv, strapped mus rau ib tug stillage los yog taped rau hauv ib nras, sau npe rau ib pob.
The single inspection, and what it looks at
A one trip band is checked once, at issue, while a fault can still be replaced from the same consignment. Look at four things, nyob rau hauv qhov kev txiav txim: the weave where it meets the load (txiav, puas, 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, swarf, roj thiab dej sawv mus rau hauv kev sib cuag, 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, vuam los yog cua sov
- 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. Saum toj no 100 °C, or where sparks are present, polyester is the wrong fibre and an endless round sling 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, not from the tonnage: two picks per pack is two bands, a four point lift is four, ninety packs at two picks is 180 bands. 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, ib cargo nqa nqa is the article to price against it. The form with eyes at both ends, for loads that are hooked rather than wrapped, yog on pov tseg ib txoj kev sling nplooj; the wider family is on the ib leeg siv slings thiab single use lifting slings endless loop nplooj ntawv.
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, choked los yog pob tawb, 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
Xa lub nra, xaiv txoj haujlwm, the girth and the factor. Peb rov qab los nrog qhov dav, 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
Lifute Industrial Park, Taizhou nroog, Jiangsu xeev, China · HS code 630790
Cov lus nug uas nquag nug
What is a one way webbing sling?
A rated polyester webbing sling supplied for a single journey. Nws mus nrog lub load, 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?
Tsis muaj. Cov fiber, weav, dav, yam kev nyab xeeb, working load limit and marking are specified exactly as for a returnable sling. The word describes the journey, not the grade, 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. Dav yog qhov ntsuas kev tiv thaiv: qhov dav ntawm lub band, 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. Sau lub rooj sib tham nrog daim duab, or give the girth of the pipe or bundle the loop must go round.
Can the same loop be used in a choker hitch?
Yog lawm, and a closed loop is the natural form for a choke on pipe, tube and bundles. Daim duab choked yog 0.8 of the vertical working load limit, yog li 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 los yog 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, thiab 6:1 zaum nruab nrab ntawm lawv. Tib tonnage ntawm qhov sib txawv yog ib tsab xov xwm sib txawv nrog qhov dav sib txawv, yog li qhov tseem ceeb belongs rau qhov kev nug.
Cov qhab tuaj yeem luam tawm nrog peb tus kheej siv?
Yog lawm. Ua hauj lwm load txwv, loop length, yam kev nyab xeeb, 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.