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
А 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 чексиз цикл form — the shape specified for pipe, tube and bundling work, because a loop wraps a cylinder instead of hooking it. Стандарттык диапазон: 1 t to 12 т, тилке туурасы 25 мм чейин 300 мм, коопсуздук фактору 5:1, 6:1 же 7:1, цикл узундугу 0.5 м чейин 100 м, marked to BS EN 1492-1.
On this page
What “one way” decides, жана ал эмне кылбайт
The phrase describes the commercial life of the article, not its quality. A one way sling is manufactured, далил жүктөлгөн, 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. Бул issued with the load, so it becomes a line on the packing list rather than an item in a sling register. Бул 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: иш жүктөө чеги, узундугу, 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; бул көтөргүчтөн алынган бааланбаган маржа. 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 бир кабаттуу чексиз жалпак салмоор 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 оролгон 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.
| Жүктөө | Why the loop suits it | What to state on the order |
|---|---|---|
| Болот түтүк жана түтүк, single joints or bundles | A round section is wrapped, not hooked; the choke grips and the band cannot slide along the pipe. | Сырткы диаметри, дубал, joint mass or bundle mass, spacing of the two pick positions. |
| PVC and PE pipe | Thin walls dent under point pressure; a wide soft face spreads the load and leaves no witness mark. | Диаметри, 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 | Жумшак, expensive and unforgiving of a burr; a polyester face is softer than the load. | Бүтүрүү (тегирмен, polished), түтүк диаметри, 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. | Бөлүм, stack height, edge condition, band direction. |
| Журналдар, 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 | Эки учунда эч нерсе металл тийбейт, сырдалган же жер бетинде, аны сатып алуу үчүн негиз болуп саналат. | Масса, тартылуу борбору, lifting points, surface finish. |
Specifications of the one way webbing sling
The figures below describe the standard build. Туурасы эркин тандоо эмес: it follows from the working load limit and from the safety factor, so the same tonnage appears at three widths. Циклдин узундугу, кабат, colour and print are made to the order.
| Продукт | One way webbing sling, чексиз цикл (тегерек) форма; also supplied with formed eyes as a disposable webbing sling one eye |
|---|---|
| Форма | Жабык цикл, жалпак токулган, band joined to itself — no eye, no end, no metal fitting |
| куруу | Single ply standard; double ply for a higher figure at the same width or a stiffer bearing face |
| Fiber | High tenacity полиэстер боо (PES); нейлон (PA) for shock loads and polypropylene on request |
| Желе калыңдыгы | 4 мм стандарт (3–10 mm across the range) |
| Жумуш жүктөмүнүн чеги | 1 т - 12 t single ply; 2 т - 24 т кош кабаттуу |
| Band туурасы | 25 мм – 300 мм, set by the working load limit and the safety factor |
| Коопсуздук фактору | 5:1 / 6:1 / 7:1, тартиби боюнча тандалып алынган |
| Циклдин узундугу | 0.5 м – 100 m in one continuous loop; minimum length rises with width |
| Узартуу | ≤ 7 % жумушчу жүктүн чегинде (полиэстер) |
| Иштөө температурасы | -40 °C чейин +100 °C үзгүлтүксүз; polyester melts at about 258 °C, so sparks and hot work need a sleeve |
| Түс | BS EN 1492-1 capacity colour — 1 т кызгылт, 2 т жашыл, 3 т сары, 4 т боз, 5 т кызыл, 6 т күрөң, 8 т көк, 10 т апельсин; OEM заказдары боюнча атайын түстөр жана басылган логотиптер |
| Белги | Жумуш жүктөмүнүн чеги, цикл узундугу, коопсуздук фактору, партия номери, customer reference; blue or white label |
| Стандарттар | BS EN 1492-1; ASME B30.9 for the 5:1 куруу; other market standards to order |
| Таңгактоо | Bundled, cartoned or palletised, labelled per pack and listed on the packing list against the printed reference |
| HS коду | 630790 |
Choosing the size: the figure from the pick, the width from the surface
Two decisions are made separately and in this order. The иш жүктөө чеги 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 туурасы 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 | Жумуш жүктөмүнүн чеги | Туурасы (5:1 / 7:1) | Типтүү колдонуу |
|---|---|---|---|
| Чейин 0.8 т | 1 т | 25 / 30 мм | Чакан түтүк, single light sections, tooling |
| 0.8 – 1.6 т | 2 т | 50 / 60 мм | Pipe to 6″ in single joints, small bundles |
| 1.6 – 2.4 т | 3 т | 75 / 90 мм | Pipe to 10″, rebar bundles, жыгач пакеттер |
| 2.4 – 3.2 т | 4 т | 100 / 120 мм | Coated pipe 12–16″, sheet packs |
| 3.2 – 4.0 т | 5 т | 125 / 150 мм | Heavy wall pipe, техника, таш |
| 4.0 – 4.8 т | 6 т | 150 / 180 мм | Түтүк байламдары, структуралык бөлүмдөр |
| 4.8 – 6.4 т | 8 т | 200 / 240 мм | Large bundles, катушкалар, log packs |
| 6.4 – 8.0 т | 10 т | 250 / 300 мм | Export pipe bundles, heavy fabricated items |
| 8.0 – 9.6 т | 12 т | 300 / 300 мм | Maximum single ply; go to double ply above this |
Узундук: 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, алмаштыруу үчүн экинчи топ жок.
| Сен жаз | дегенди билдирет | Аны качан колдонуу керек |
|---|---|---|
| Циклдин айланасы 4.0 м | Жүктү бир толук айлануу, жабык циклдин айланасында өлчөнөт | Топко белгилуу обочту ороп коюуга буйрук берилет |
| Топтун узундугу 2.0 м, тегиз салынган | The webbing cut length before joining — half the circumference | Топтун баасы жана метр менен кесилген |
| Тандап алууда 1.6 м, эки тандоо | Жүктүн өзү өлчөм, plus the number of bands | Safest form on a first order: ага эч кандай конвенция керек эмес |
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.
| Аранжировка | Фактор | А 5 t цикл берет | Кайда колдонулат |
|---|---|---|---|
| Vertical — loop hangs, бир жагына жүктөө | 1.0 | 5.0 т | Single point pick, hook through the loop |
| Choked — round the load and back through itself | 0.8 | 4.0 т | түтүк, түтүк, устундар, барабандар, таңгактар |
| Себет, буттары 0–45° | 2.0 | 10.0 т | Under a bundle with both legs carrying |
| Себет, буттары 45–60° | 1.4 | 7.0 т | Wide bundles, short sling legs |
Муунткуч - бул цикл сатып алынган аранжировка, жана ал дагы кымбат турат 20 % of the printed figure. А 4.5 т түтүк таңгагы а 5 t цикли ашыкча жүктөө болуп саналат, not a margin — the answer is the next width up, not a longer band.
Coating and surface compatibility
| Surface | Risk in the lift | Sling measure |
|---|---|---|
| Hot dip galvanised pipe | Zinc layer rubbed through by sliding hardware; white rust at a scored line | Чексиз цикл, арматуралар жок, 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 and PE pipe | Denting and ovality under a narrow band, especially in warm weather | 150–200 mm band, эки тандоо, basket rather than a single choke on long joints |
| Stainless tube | Iron contamination and scratching from contact with steel fittings | Dedicated synthetic sling, металл контакт жок, 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 | Жумшак цикл, edge sleeves, protector where the band crosses an arris |
Белгилөө, 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: жумушчу жүктүн чеги, the loop length with its convention, коопсуздук фактору, and the reference the despatch actually uses — a batch, пакеттин номери, заказ номери же өзүңүздүн бөлүктүн номери. That reference is what ties the band on a quay to the line on a packing list in an office.
- Сапардан кийин окууга болот, өндүрүштөн кийин эмес. Small, low contrast print on a face that enters the choke will not be read at the far end.
- Экинчи канал катары түс. Пакеттин түрүнө бир түс, 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, жана ленталарды үкөктүн ичине жыйноо мүмкүн, скотчка байланган же боого чапталган, labelled per pack.
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, бул тартипте: жүккө туура келген жерде токуу (кесип, абразия, айнектелген же чымчылган бет), цикл жабылган жерде бириктирүү, the label — an unreadable figure cannot be matched to the pack it was cut for — and what the band has been lying in. Grit, талкан, май жана турган суу контактка өтөт, 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, ширетүү же жылытуу
- 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, ысык беттер жана жең же төшөлгөн коргоочу менен ширетүүчү чачыратуулар. Жогоруда 100 °C, or where sparks are present, polyester is the wrong fibre and an чексиз тегерек салмоор 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. Пакеттен сана, тоннадан эмес: бир пакетте эки тандоо эки тилке болуп саналат, a four point lift is four, ninety packs at two picks is 180 топтор. Add two to five per cent for the band cut while the pack is made up, ошондуктан жетишсиздик докто кечиктирүүнүн ордуна буйрук боюнча сызык болуп калат.
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, а жүк көтөрүүчү тор is the article to price against it. The form with eyes at both ends, for loads that are hooked rather than wrapped, үстүндө турат disposable one way sling бет; the wider family is on the бир жолу колдонулуучу шпалдар жана single use lifting slings endless loop барактар.
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, муунган же себет, 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
Жүктү жөнөт, позицияларды тандоо, the girth and the factor. Биз туурасы менен кайтып келебиз, цикл узундугу, the finished weight and the marking — on a drawing, топ кесилгенге чейин.
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Көп берилүүчү суроолор
What is a one way webbing sling?
A rated polyester webbing sling supplied for a single journey. Ал жүк менен барат, 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?
Жок. була, токуу, туурасы, коопсуздук фактору, working load limit and marking are specified exactly as for a returnable sling. Бул сөз сапарды сүрөттөйт, 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. Кеңдиги коргоо чарасы болуп саналат: топтун кеңдиги, 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: жабык циклдин айланасы, жана кошулганга чейин жалпак төшөлгөн топтун узундугу. 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?
Ооба, and a closed loop is the natural form for a choke on pipe, tube and bundles. Мункунган фигура 0.8 of the vertical working load limit, ошондуктан а 5 t луп муунтуп 4 т. Select the width for the arrangement actually used.
Кайсы коопсуздук факторун заказ кылышым керек, 5:1, 6:1 же 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, жана 6:1 алардын ортосунда отурат. Башка фактордогу бир эле тоннаж - бул башка кеңдиктеги башка макала, ошондуктан фактор суроого тиешелүү.
Топту өзүбүздүн маалымдама менен басып чыгарууга болобу?
Ооба. Жумуш жүктөмүнүн чеги, цикл узундугу, коопсуздук фактору, 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.