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 бясконцы цыкл form — the shape specified for pipe, tube and bundling work, because a loop wraps a cylinder instead of hooking it. Стандартны дыяпазон: 1 т да 12 t, шырыня паласы 25 мм да 300 мм, каэфіцыент бяспекі 5:1, 6:1 або 7:1, даўжыня завесы 0.5 м да 100 м, marked to BS EN 1492-1.
On this page
What “one way” decides, і чаго не робіць
The phrase describes the commercial life of the article, not its quality. A one way sling is manufactured, доказ загружаны, 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. Гэта так выдаецца з грузам, so it becomes a line on the packing list rather than an item in a sling register. Гэта так 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: мяжа працоўнай нагрузкі, даўжыня, 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; гэта ненамінальная маржа, узятая з ліфта. 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 аднаслаёвы бясконцы плоскі строп 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.
| Нагрузка | Why the loop suits it | What to state on the order |
|---|---|---|
| Сталёвыя трубы і трубкі, single joints or bundles | A round section is wrapped, not hooked; the choke grips and the band cannot slide along the pipe. | Вонкавы дыяметр, сцяна, joint mass or bundle mass, spacing of the two pick positions. |
| ПВХ і ПЭ трубы | Thin walls dent under point pressure; a wide soft face spreads the load and leaves no witness mark. | Дыяметр, 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 | Мяккі, expensive and unforgiving of a burr; a polyester face is softer than the load. | Скончыць (млын, polished), дыяметр трубкі, 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. | Раздзел, stack height, edge condition, band direction. |
| Logs, 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 | Нішто металічнае не дакранаецца грузу з абодвух канцоў, які на афарбаванай або адшліфаванай паверхні з'яўляецца прычынай яго пакупкі. | Імша, цэнтр цяжару, lifting points, surface finish. |
Specifications of the one way webbing sling
The figures below describe the standard build. Шырыня не з'яўляецца свабодным выбарам: it follows from the working load limit and from the safety factor, so the same tonnage appears at three widths. Даўжыня завесы, курсіраваць, colour and print are made to the order.
| Прадукт | One way webbing sling, бясконцы цыкл (кругавая) форма; also supplied with formed eyes as a disposable webbing sling one eye |
|---|---|
| Форма | Замкнёнае кола, плоскатканыя, band joined to itself — no eye, no end, no metal fitting |
| Будаваць | Single ply standard; double ply for a higher figure at the same width or a stiffer bearing face |
| Абалоніна | High tenacity polyester webbing (PES); нейлон (ПА) for shock loads and polypropylene on request |
| Таўшчыня павуціння | 4 стандарт мм (3–10 mm across the range) |
| Ліміт працоўнай нагрузкі | 1 т - 12 t single ply; 2 т - 24 т двайны пласт |
| Шырыня паласы | 25 мм – 300 мм, set by the working load limit and the safety factor |
| Каэфіцыент бяспекі | 5:1 / 6:1 / 7:1, выбраны на заказ |
| Даўжыня завесы | 0.5 м – 100 м у адну суцэльную пятлю; minimum length rises with width |
| Падаўжэнне | ≤ 7 % на мяжы працоўнай нагрузкі (поліэстэр) |
| Працоўная тэмпература | ад −40 °C да +100 °C бесперапынна; polyester melts at about 258 °C, so sparks and hot work need a sleeve |
| Колер | BS EN 1492-1 capacity colour — 1 т фіялетавы, 2 т зялёны, 3 т жоўты, 4 т шэры, 5 т чырвоны, 6 т карычневы, 8 т блакітны, 10 т аранжавы; спецыяльныя колеры і друкаваныя лагатыпы па заказах OEM |
| Этыкетка | Ліміт працоўнай нагрузкі, даўжыня завесы, каэфіцыент бяспекі, нумар партыі, customer reference; blue or white label |
| Standards | BS EN 1492-1; ASME B30.9 for the 5:1 будаваць; other market standards to order |
| Ўпакоўка | Bundled, cartoned or palletised, labelled per pack and listed on the packing list against the printed reference |
| Код HS | 630790 |
Choosing the size: the figure from the pick, the width from the surface
Two decisions are made separately and in this order. The мяжа працоўнай нагрузкі 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 шырыня 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 | Ліміт працоўнай нагрузкі | Шырыня (5:1 / 7:1) | Звычайнае выкарыстанне |
|---|---|---|---|
| Да 0.8 t | 1 t | 25 / 30 мм | Труба малога ствала, single light sections, tooling |
| 0.8 – 1.6 t | 2 t | 50 / 60 мм | Pipe to 6″ in single joints, small bundles |
| 1.6 – 2.4 t | 3 t | 75 / 90 мм | Pipe to 10″, rebar bundles, пакеты драўніны |
| 2.4 – 3.2 t | 4 t | 100 / 120 мм | Coated pipe 12–16″, ліставыя ўпакоўкі |
| 3.2 – 4.0 t | 5 t | 125 / 150 мм | Heavy wall pipe, тэхніка, камень |
| 4.0 – 4.8 t | 6 t | 150 / 180 мм | Pipe bundles, structural sections |
| 4.8 – 6.4 t | 8 t | 200 / 240 мм | Large bundles, шпулькі, log packs |
| 6.4 – 8.0 t | 10 t | 250 / 300 мм | Export pipe bundles, heavy fabricated items |
| 8.0 – 9.6 t | 12 t | 300 / 300 мм | Maximum single ply; go to double ply above this |
Даўжыня: the two conventions, and why the mistake is expensive here
У пятлі няма канцоў, паміж якімі можна было б вымераць, 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, без другога дыяпазону для замены.
| Вы пішаце | Гэта значыць | Калі яго выкарыстоўваць |
|---|---|---|
| Акружнасць завесы 4.0 м | Адзін поўны абарот грузу, вымяраецца вакол замкнёнага контуру | Паласу загадваюць накруціць на вядомы абхапілі |
| Даўжыня стужкі 2.0 м, пакладзены роўна | The webbing cut length before joining — half the circumference | Стужка вызначаецца па цане і выразаецца на метры |
| Абхапілі на выбары 1.6 м, два выбары | Памер самой нагрузкі, plus the number of bands | Safest form on a first order: гэта ўвогуле не патрабуе ўмоўнасці |
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.
| Аранжыроўка | Фактар | А 5 т пятля дае | Дзе выкарыстоўваецца |
|---|---|---|---|
| Vertical — loop hangs, нагрузка з аднаго боку | 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 | Труба, трубка, poles, барабаны, пучкі |
| Кошык, ногі 0-45° | 2.0 | 10.0 t | Under a bundle with both legs carrying |
| Кошык, ногі 45-60° | 1.4 | 7.0 t | Wide bundles, short sling legs |
Дросель - гэта прыстасаванне, для якога купляецца пятля, і гэта таксама той, які каштуе 20 % of the printed figure. А 4.5 t пучок труб захлынуўся на a 5 цыкл t - гэта перагрузка, not a margin — the answer is the next width up, not a longer band.
Coating and surface compatibility
| Паверхня | Risk in the lift | Sling measure |
|---|---|---|
| Hot dip galvanised pipe | Zinc layer rubbed through by sliding hardware; white rust at a scored line | Бясконцы цыкл, няма арматуры, 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 |
| ПВХ і ПЭ трубы | Denting and ovality under a narrow band, especially in warm weather | 150–200 mm band, два выбары, basket rather than a single choke on long joints |
| Stainless tube | Iron contamination and scratching from contact with steel fittings | Dedicated synthetic sling, no metal contact, ачысціць сховішча перад выпускам |
| 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 |
Разметка, 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: мяжа працоўнай нагрузкі, the loop length with its convention, каэфіцыент бяспекі, and the reference the despatch actually uses — a batch, нумар пачкі, an order number or your own part number. That reference is what ties the band on a quay to the line on a packing list in an office.
- Разборлівы пасля падарожжа, не пасля вытворчасці. Small, low contrast print on a face that enters the choke will not be read at the far end.
- Colour as a second channel. Адзін колер на тып упакоўкі, 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, and the bands can be packed inside a crate, прывязаныя да калодкі або скотчам у пучок, 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, у такім парадку: пляценне там, дзе яно сустракае нагрузку (парэзы, пацёртасць, зашклёнае або заціснутае твар), злучэнне, дзе замыкаецца цыкл, the label — an unreadable figure cannot be matched to the pack it was cut for — and what the band has been lying in. Грыт, стружка, алей і стаячая вада рухаюцца ў кантакт, 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, зварка або нагрэў
- 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, гарачых паверхняў і зварачных пырскаў з дапамогай рукава або мяккага пратэктара. Вышэй 100 °C, or where sparks are present, polyester is the wrong fibre and an бясконцы круглы слінг 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. Адлік ад зграі, не ад танажу: два выбары ў пакунку - гэта дзве паласы, a four point lift is four, ninety packs at two picks is 180 гурты. Add two to five per cent for the band cut while the pack is made up, таму дэфіцыт становіцца радком у замове замест затрымкі на лаве падсудных.
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 грузапад'ёмная сетка is the article to price against it. The form with eyes at both ends, for loads that are hooked rather than wrapped, знаходзіцца на аднаразовы аднабаковы слінг старонка; the wider family is on the single use slings і single use lifting slings endless loop старонкі.
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, душылі або кошык, 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
Адправіць груз, the pick positions, the girth and the factor. Вяртаемся да шырыні, даўжыня завесы, the finished weight and the marking — on a drawing, перш чым паласа будзе разрэзана.
Send your sling specification · Telephone / WeChat +86 180 6600 2268 · 702461526@qq.com
Індустрыяльны парк Ліфутэ, Горад Тайчжоу, Правінцыя Цзянсу, China · HS code 630790
Часта задаюць пытанні
What is a one way webbing sling?
A rated polyester webbing sling supplied for a single journey. Едзе з грузам, 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?
няма. Абалоніна, ткаць, шырыня, каэфіцыент бяспекі, working load limit and marking are specified exactly as for a returnable sling. Слова апісвае падарожжа, 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. Шырыня - мера абароны: the wider the 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: акружнасць замкнёнага контуру, і даўжыня стужкі, пакладзенай роўна перад злучэннем. Назавіце ўмоўнае пагадненне з малюнкам, or give the girth of the pipe or bundle the loop must go round.
Can the same loop be used in a choker hitch?
так, and a closed loop is the natural form for a choke on pipe, tube and bundles. Задушаная фігура ёсць 0.8 of the vertical working load limit, так а 5 цокальныя дроселі 4 t. Select the width for the arrangement actually used.
Які каэфіцыент бяспекі я павінен заказаць, 5:1, 6:1 або 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, і 6:1 сядзіць паміж імі. Той жа танаж пры розным каэфіцыенце - гэта іншы артыкул з рознай шырынёй, so the factor belongs on the enquiry.
Ці можа гурт быць надрукаваны з нашай спасылкай?
так. Ліміт працоўнай нагрузкі, даўжыня завесы, каэфіцыент бяспекі, 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.