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 walang katapusang loop form — the shape specified for pipe, tube and bundling work, because a loop wraps a cylinder instead of hooking it. Karaniwang saklaw: 1 t sa 12 t, lapad ng banda 25 mm sa 300 mm, kadahilanan ng kaligtasan 5:1, 6:1 o 7:1, haba ng loop 0.5 m sa 100 m, marked to BS EN 1492-1.
On this page
What “one way” decides, at kung ano ang hindi
The phrase describes the commercial life of the article, not its quality. A one way sling is manufactured, proof load, 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. Ito ay inisyu kasama ang load, so it becomes a line on the packing list rather than an item in a sling register. Ito ay inspected once, sa punto ng isyu, while a fault can still be replaced from the same consignment. And its print is its whole record: limitasyon ng pagkarga ng trabaho, haba, 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.
Ang hindi nito binabago ay ang engineering. A narrow band or a lower factor chosen because “it is only going one way” is not a saving; ito ay isang unrated margin na kinuha sa elevator. 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 single 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 nakabalot 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.
| Magkarga | Why the loop suits it | What to state on the order |
|---|---|---|
| Bakal na tubo at tubo, single joints or bundles | A round section is wrapped, not hooked; the choke grips and the band cannot slide along the pipe. | Panlabas na diameter, pader, joint mass or bundle mass, spacing of the two pick positions. |
| PVC at PE pipe | Thin walls dent under point pressure; a wide soft face spreads the load and leaves no witness mark. | diameter, 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 | Malambot, mahal at hindi mapagpatawad ng isang burr; a polyester face is softer than the load. | Tapusin (gilingan, polished), diameter ng 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. | Seksyon, taas ng stack, kondisyon ng gilid, band direction. |
| Mga 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 | Walang anumang metal na nakakahipo sa kargada sa magkabilang dulo, na sa ibabaw ng pininturahan o lupa ang dahilan para bilhin ito. | Ang misa, sentro ng grabidad, lifting points, surface finish. |
Specifications of the one way webbing sling
The figures below describe the standard build. Ang lapad ay hindi isang libreng pagpili: it follows from the working load limit and from the safety factor, so the same tonnage appears at three widths. Haba ng loop, sapin, colour and print are made to the order.
| produkto | One way webbing sling, walang katapusang loop (pabilog) anyo; also supplied with formed eyes as a disposable webbing sling one eye |
|---|---|
| Form | Saradong loop, patag na habi, band joined to itself — no eye, no end, no metal fitting |
| Bumuo | Single ply standard; double ply for a higher figure at the same width or a stiffer bearing face |
| Hibla | High tenacity polyester webbing (PES); naylon (PA) for shock loads and polypropylene on request |
| kapal ng web | 4 mm pamantayan (3–10 mm across the range) |
| Limitasyon ng pagkarga sa pagtatrabaho | 1 t – 12 t single ply; 2 t – 24 t dobleng sapin |
| Lapad ng banda | 25 mm – 300 mm, set by the working load limit and the safety factor |
| Salik ng kaligtasan | 5:1 / 6:1 / 7:1, pinili sa pagkakasunud-sunod |
| Haba ng loop | 0.5 m – 100 m sa isang tuloy-tuloy na loop; minimum length rises with width |
| Pagpahaba | ≤ 7 % sa working load limit (polyester) |
| Temperatura ng pagtatrabaho | −40 °C hanggang +100 °C tuloy-tuloy; polyester melts at about 258 °C, so sparks and hot work need a sleeve |
| Kulay | BS EN 1492-1 capacity colour — 1 t violet, 2 t berde, 3 t dilaw, 4 t kulay abo, 5 t pula, 6 t kayumanggi, 8 t asul, 10 t orange; mga espesyal na kulay at naka-print na logo sa mga order ng OEM |
| Label | Limitasyon ng pagkarga sa pagtatrabaho, haba ng loop, kadahilanan ng kaligtasan, batch number, customer reference; blue or white label |
| Mga pamantayan | BS EN 1492-1; ASME B30.9 for the 5:1 magtayo; other market standards to order |
| Pag-iimpake | 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. Ang limitasyon ng pagkarga ng trabaho 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. Ang lapad 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 | Limitasyon ng pagkarga sa pagtatrabaho | Lapad (5:1 / 7:1) | Karaniwang gamit |
|---|---|---|---|
| Hanggang sa 0.8 t | 1 t | 25 / 30 mm | Maliit na 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, mga pakete ng troso |
| 2.4 – 3.2 t | 4 t | 100 / 120 mm | Coated pipe 12–16″, mga sheet pack |
| 3.2 – 4.0 t | 5 t | 125 / 150 mm | Heavy wall pipe, makinarya, bato |
| 4.0 – 4.8 t | 6 t | 150 / 180 mm | Mga bundle ng tubo, mga seksyon ng istruktura |
| 4.8 – 6.4 t | 8 t | 200 / 240 mm | Large bundles, mga 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 |
Ang haba: the two conventions, and why the mistake is expensive here
Ang isang loop ay walang mga dulo upang masukat sa pagitan, 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, na walang pangalawang banda na palitan.
| Sumulat ka | Ibig sabihin | Kailan ito gagamitin |
|---|---|---|
| Ang circumference ng loop 4.0 m | Isang buong pagliko ang pagkarga, sinusukat sa paligid ng closed loop | Inutusan ang banda na balutin ang isang kilalang kabilogan |
| Haba ng banda 2.0 m, inilatag na patag | The webbing cut length before joining — half the circumference | Ang banda ay may presyo at pinutol ng metro |
| Girth sa pick 1.6 m, dalawang pick | Ang sukat ng load mismo, plus the number of bands | Safest form on a first order: ito ay hindi nangangailangan ng kombensyon sa lahat |
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.
| Pag-aayos | Salik | A 5 t loop ay nagbibigay | Kung saan ito ginagamit |
|---|---|---|---|
| Vertical — loop hangs, load sa isang tabi | 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 | Pipe, tubo, mga poste, mga tambol, mga bundle |
| Basket, binti 0–45° | 2.0 | 10.0 t | Under a bundle with both legs carrying |
| Basket, binti 45–60° | 1.4 | 7.0 t | Wide bundles, short sling legs |
Ang choke ay ang kaayusan na binili ng loop, at ito rin ang nagkakahalaga 20 % of the printed figure. A 4.5 t pipe bundle nabulunan sa a 5 Ang t loop ay isang labis na karga, not a margin — the answer is the next width up, not a longer band.
Coating and surface compatibility
| Ibabaw | Risk in the lift | Sling measure |
|---|---|---|
| Hot dip galvanised pipe | Zinc layer rubbed through by sliding hardware; white rust at a scored line | Walang katapusang loop, walang kabit, 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 at PE pipe | Denting and ovality under a narrow band, especially in warm weather | 150–200 mm band, dalawang pick, basket rather than a single choke on long joints |
| Stainless tube | Iron contamination and scratching from contact with steel fittings | Dedicated synthetic sling, walang metal contact, malinis na imbakan bago ilabas |
| 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 | Malambot na loop, edge sleeves, protector where the band crosses an arris |
Pagmamarka, 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: ang working load limit, the loop length with its convention, ang kadahilanan ng kaligtasan, and the reference the despatch actually uses — a batch, isang numero ng pakete, isang numero ng order o iyong sariling numero ng bahagi. That reference is what ties the band on a quay to the line on a packing list in an office.
- Mababasa pagkatapos ng paglalakbay, hindi pagkatapos ng produksyon. Small, low contrast print on a face that enters the choke will not be read at the far end.
- Kulay bilang pangalawang channel. Isang kulay bawat uri ng pakete, 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, at ang mga banda ay maaaring ilagay sa loob ng isang crate, naka-strapped sa isang stillage o naka-tape sa isang bundle, may label bawat pack.
The single inspection, and what it looks at
A one trip band is checked once, pinag-uusapan, while a fault can still be replaced from the same consignment. Look at four things, sa ganitong pagkakasunud-sunod: ang habi kung saan ito nakakatugon sa karga (mga hiwa, hadhad, isang nanlilisik o naipit na mukha), ang pagdugtong kung saan nagsasara ang loop, 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, ang langis at tumatayong tubig ay naglalakbay sa 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, hinang o pag-init
- 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, mainit na ibabaw at welding spatter na may manggas o may padded protector. sa itaas 100 °C, or where sparks are present, polyester is the wrong fibre and an walang katapusang bilog na lambanog 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, walang rehistro ng inspeksyon, no repair and no loss write-off — but it has to be counted correctly, because nothing comes back to cover a shortfall. Bilangin mula sa pack, hindi mula sa tonelada: dalawang pick bawat pack ay dalawang banda, a four point lift is four, ninety packs at two picks is 180 mga banda. Add two to five per cent for the band cut while the pack is made up, kaya ang isang kakulangan ay nagiging linya sa order sa halip na isang pagkaantala sa pantalan.
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 cargo lifting net is the article to price against it. The form with eyes at both ends, for loads that are hooked rather than wrapped, ay nasa disposable one way sling pahina; the wider family is on the solong gamit na lambanog at single use lifting slings endless loop mga pahina.
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, sinakal o basket, 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
Ipadala ang load, ang mga posisyon ng pagpili, the girth and the factor. Bumalik kami na may lapad, ang haba ng loop, the finished weight and the marking — on a drawing, bago maputol ang banda.
Send your sling specification · Telephone / WeChat +86 180 6600 2268 · 702461526@qq.com
Lifute Industrial Park, Lungsod ng Taizhou, Lalawigan ng Jiangsu, China · HS code 630790
Mga madalas itanong
What is a one way webbing sling?
A rated polyester webbing sling supplied for a single journey. Naglalakbay ito kasama ang karga, 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?
Hindi. Ang hibla, paghabi, lapad, kadahilanan ng kaligtasan, working load limit and marking are specified exactly as for a returnable sling. Ang salita ay naglalarawan sa paglalakbay, hindi ang 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. Ang lapad ay ang panukalang proteksyon: mas malawak ang 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: ang circumference ng closed loop, at ang haba ng banda ay nakahiga bago sumali. Pangalanan ang kumbensyon gamit ang 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?
Oo, and a closed loop is the natural form for a choke on pipe, tube and bundles. Ang sinakal na pigura ay 0.8 of the vertical working load limit, kaya a 5 t loop nasasakal 4 t. Select the width for the arrangement actually used.
Aling safety factor ang dapat kong i-order, 5:1, 6:1 o 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, at 6:1 nakaupo sa pagitan nila. Ang parehong tonelada sa ibang salik ay ibang artikulo na may ibang lapad, kaya ang kadahilanan ay nabibilang sa pagtatanong.
Maaari bang i-print ang banda gamit ang aming sariling sanggunian?
Oo. Limitasyon ng pagkarga sa pagtatrabaho, haba ng loop, kadahilanan ng kaligtasan, 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.