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 cabestrillo de cinta unidireccional 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 bucle interminable form — the shape specified for pipe, tube and bundling work, because a loop wraps a cylinder instead of hooking it. Rango estándar: 1 t a 12 t, band width 25 mm a 300 mm, factor de seguridade 5:1, 6:1 ou 7:1, lonxitude do bucle 0.5 m a 100 m, marked to BS EN 1492-1.
On this page
What “one way” decides, e o que non
The phrase describes the commercial life of the article, not its quality. A one way sling is manufactured, proof 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. É emitido coa carga, so it becomes a line on the packing list rather than an item in a sling register. É inspected once, no punto da cuestión, while a fault can still be replaced from the same consignment. And its print is its whole record: límite de carga de traballo, lonxitude, 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.
O que non cambia é a enxeñería. A narrow band or a lower factor chosen because “it is only going one way” is not a saving; é unha marxe sen clasificar sacada do ascensor. 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 eslinga plana sen fin dunha soa capa 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.
| Carga | Why the loop suits it | What to state on the order |
|---|---|---|
| Tubo e tubo de aceiro, single joints or bundles | A round section is wrapped, not hooked; the choke grips and the band cannot slide along the pipe. | Diámetro exterior, wall, joint mass or bundle mass, spacing of the two pick positions. |
| Tubo de PVC e PE | Thin walls dent under point pressure; a wide soft face spreads the load and leaves no witness mark. | Diámetro, 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 | Suave, expensive and unforgiving of a burr; a polyester face is softer than the load. | Remate (muíño, polished), diámetro do tubo, 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. | Sección, altura de pila, condición de borde, band direction. |
| Rexistros, 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 | Nada metálico toca a carga en cada extremo, que sobre unha superficie pintada ou chan é o motivo para mercalo. | Misa, centro de gravidade, lifting points, surface finish. |
Specifications of the one way webbing sling
The figures below describe the standard build. O ancho non é unha elección libre: it follows from the working load limit and from the safety factor, so the same tonnage appears at three widths. Lonxitude do bucle, capa, colour and print are made to the order.
| Produto | One way webbing sling, bucle interminable (circular) forma; also supplied with formed eyes as a disposable webbing sling one eye |
|---|---|
| Formulario | Bucle pechado, tecido plano, band joined to itself — no eye, no end, no metal fitting |
| Construír | Single ply standard; double ply for a higher figure at the same width or a stiffer bearing face |
| Fibra | High tenacity cinta de poliéster (PES); nailon (PA) for shock loads and polypropylene on request |
| Grosor da web | 4 mm estándar (3–10 mm across the range) |
| Límite de carga de traballo | 1 t – 12 t single ply; 2 t – 24 t dobre capa |
| Ancho de banda | 25 mm - 300 mm, set by the working load limit and the safety factor |
| Factor de seguridade | 5:1 / 6:1 / 7:1, seleccionado por encargo |
| Lonxitude do bucle | 0.5 m – 100 m nun bucle continuo; minimum length rises with width |
| Alongamento | ≤ 7 % no límite de carga de traballo (poliéster) |
| Temperatura de traballo | -40 °C a +100 °C continuo; polyester melts at about 258 °C, so sparks and hot work need a sleeve |
| Cor | BS EN 1492-1 capacity colour — 1 t violeta, 2 t verde, 3 t amarelo, 4 t gris, 5 t vermello, 6 t marrón, 8 t azul, 10 t laranxa; cores especiais e logotipos impresos en pedidos de OEM |
| Etiqueta | Límite de carga de traballo, lonxitude do bucle, factor de seguridade, número de lote, customer reference; blue or white label |
| Estándares | BS EN 1492-1; ASME B30.9 for the 5:1 construír; other market standards to order |
| Embalaxe | Bundled, cartoned or palletised, labelled per pack and listed on the packing list against the printed reference |
| Código HS | 630790 |
Choosing the size: the figure from the pick, the width from the surface
Two decisions are made separately and in this order. O límite de carga de traballo 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. O ancho 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 | Límite de carga de traballo | Anchura (5:1 / 7:1) | Uso típico |
|---|---|---|---|
| Ata 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, paquetes de madeira |
| 2.4 – 3.2 t | 4 t | 100 / 120 mm | Coated pipe 12–16″, paquetes de follas |
| 3.2 – 4.0 t | 5 t | 125 / 150 mm | Heavy wall pipe, maquinaria, pedra |
| 4.0 – 4.8 t | 6 t | 150 / 180 mm | Pipe bundles, seccións estruturais |
| 4.8 – 6.4 t | 8 t | 200 / 240 mm | Large bundles, bobinas, 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 |
Lonxitude: the two conventions, and why the mistake is expensive here
Un bucle non ten extremos para medir, 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, sen unha segunda banda para intercambiar.
| Ti escribes | Significa | Cando usalo |
|---|---|---|
| Circunferencia do bucle 4.0 m | Unha volta completa á carga, medido ao redor do lazo pechado | A banda recibe a orde de envolver unha circunferencia coñecida |
| Lonxitude da banda 2.0 m, deitado plano | The webbing cut length before joining — half the circumference | A banda ten un prezo e córtase por metro |
| Circunferencia na picota 1.6 m, dúas seleccións | A dimensión da propia carga, plus the number of bands | Safest form on a first order: non necesita ningún tipo de convención |
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.
| Arranxo | Factor | A 5 t bucle dá | Onde se usa |
|---|---|---|---|
| Vertical — loop hangs, carga por un lado | 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 | Tubo, tubo, poles, tambores, fardos |
| Cesta, pernas 0-45° | 2.0 | 10.0 t | Under a bundle with both legs carrying |
| Cesta, patas 45-60° | 1.4 | 7.0 t | Wide bundles, short sling legs |
O estrangulamento é o arranxo para o que se compra un bucle, e tamén é o que custa 20 % of the printed figure. A 4.5 t feixe de tubos atragantado nun 5 o bucle t é unha sobrecarga, not a margin — the answer is the next width up, not a longer band.
Coating and surface compatibility
| Superficie | Risk in the lift | Sling measure |
|---|---|---|
| Hot dip galvanised pipe | Zinc layer rubbed through by sliding hardware; white rust at a scored line | Bucle sen fin, sen accesorios, 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 |
| Tubo de PVC e PE | Denting and ovality under a narrow band, especially in warm weather | 150–200 mm band, dúas seleccións, basket rather than a single choke on long joints |
| Stainless tube | Iron contamination and scratching from contact with steel fittings | Dedicated synthetic sling, sen contacto metálico, almacenamento limpo antes da emisión |
| 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 |
Marcado, 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: límite de carga de traballo, the loop length with its convention, o factor de seguridade, and the reference the despatch actually uses — a batch, un número de paquete, un número de pedido ou o seu propio número de peza. That reference is what ties the band on a quay to the line on a packing list in an office.
- Lexible despois da viaxe, non despois da produción. Small, low contrast print on a face that enters the choke will not be read at the far end.
- Cor como segunda canle. Unha cor por tipo de paquete, 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, e as bandas pódense embalar dentro dunha caixa, atado a un alabeo ou pegado a un fardo, etiquetado por paquete.
The single inspection, and what it looks at
A one trip band is checked once, en cuestión, while a fault can still be replaced from the same consignment. Look at four things, nesta orde: o tecido onde se atopa coa carga (cortes, abrasión, unha cara esmaltada ou pinchada), a unión onde se pecha o bucle, the label — an unreadable figure cannot be matched to the pack it was cut for — and what the band has been lying in. Grana, viruxa, o aceite e a auga estancada viaxan ao contacto, 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, soldadura ou calefacción
- 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, superficies quentes e salpicaduras de soldadura cunha manga ou un protector acolchado. Arriba 100 °C, or where sparks are present, polyester is the wrong fibre and an cabestrillo redondo interminable 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, ningún rexistro de inspección, no repair and no loss write-off — but it has to be counted correctly, because nothing comes back to cover a shortfall. Conta dende o paquete, non da tonelaxe: dúas seleccións por paquete son dúas bandas, a four point lift is four, ninety packs at two picks is 180 bandas. Add two to five per cent for the band cut while the pack is made up, polo que un déficit convértese nunha liña na orde en lugar dun atraso no muelle.
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 rede de elevación de carga is the article to price against it. The form with eyes at both ends, for loads that are hooked rather than wrapped, está no cabestrillo unidireccional desbotable páxina; the wider family is on the eslingas dun só uso e single use lifting slings endless loop páxinas.
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, asfixiado ou cesto, 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
Envía a carga, the pick positions, the girth and the factor. Volvemos co ancho, lonxitude do bucle, the finished weight and the marking — on a drawing, antes de cortar a banda.
Send your sling specification · Telephone / WeChat +86 180 6600 2268 · 702461526@qq.com
Parque Industrial Lifute, Cidade de Taizhou, Provincia de Jiangsu, China · HS code 630790
Preguntas frecuentes
What is a one way webbing sling?
A rated polyester webbing sling supplied for a single journey. It travels with the 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?
Non. A fibra, tecer, ancho, factor de seguridade, working load limit and marking are specified exactly as for a returnable sling. A palabra describe a viaxe, 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. O ancho é a medida de protección: canto máis ampla é a banda, 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: a circunferencia do lazo pechado, e a lonxitude da banda colocada plana antes de unirse. 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?
Si, and a closed loop is the natural form for a choke on pipe, tube and bundles. A figura atragantada é 0.8 of the vertical working load limit, así a 5 t loop chokes 4 t. Select the width for the arrangement actually used.
Que factor de seguridade debo pedir, 5:1, 6:1 ou 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, e 6:1 senta entre eles. A mesma tonelaxe nun factor diferente é un artigo diferente cun ancho diferente, polo que o factor pertence á investigación.
Pódese imprimir a banda coa nosa propia referencia?
Si. Límite de carga de traballo, lonxitude do bucle, factor de seguridade, 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.