Lift sling rigging company produce One-Way Webbing Sling,ワンウェイエンドレスウェビングスリング,Polyester Single Trip One Way endless webbing slings.
One Way Webbing Sling
あ 一方向ウェビングスリング 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 無限ループ form — the shape specified for pipe, tube and bundling work, because a loop wraps a cylinder instead of hooking it. 標準範囲: 1 へ 12 t, バンド幅 25 mmから 300 mm, 安全率 5:1, 6:1 または 7:1, ループの長さ 0.5 メートルから 100 メートル, marked to BS EN 1492-1.
On this page
What “one way” decides, そしてそれができないこと
The phrase describes the commercial life of the article, not its quality. A one way sling is manufactured, 校正済み, 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. それは ロードとともに発行される, so it becomes a line on the packing list rather than an item in a sling register. それは 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: 使用荷重制限, 長さ, 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; それはリフトから取り出された未評価マージンです. 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 単層エンドレスフラットスリング 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 包まれた 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.
| 負荷 | Why the loop suits it | What to state on the order |
|---|---|---|
| Steel pipe and tube, single joints or bundles | A round section is wrapped, not hooked; the choke grips and the band cannot slide along the pipe. | 外径, 壁, joint mass or bundle mass, spacing of the two pick positions. |
| PVCおよびPEパイプ | Thin walls dent under point pressure; a wide soft face spreads the load and leaves no witness mark. | 直径, 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 | 柔らかい, expensive and unforgiving of a burr; a polyester face is softer than the load. | 仕上げる (ミル, polished), チューブの直径, 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. | セクション, スタックの高さ, エッジの状態, band direction. |
| ログ, 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 | どちらの端でも負荷に金属が触れていない, 塗装面と研磨面のどちらが購入する理由ですか. | 質量, 重心, lifting points, surface finish. |
Specifications of the one way webbing sling
The figures below describe the standard build. 幅は自由に選べるわけではない: it follows from the working load limit and from the safety factor, so the same tonnage appears at three widths. ループの長さ, プライ, colour and print are made to the order.
| 製品 | One way webbing sling, 無限ループ (円形) 形状; also supplied with formed eyes as a disposable webbing sling one eye |
|---|---|
| 形状 | 閉ループ, 平織り, band joined to itself — no eye, no end, no metal fitting |
| 建てる | Single ply standard; double ply for a higher figure at the same width or a stiffer bearing face |
| ファイバ | High tenacity ポリエステルウェビング (PES); ナイロン (PA) for shock loads and polypropylene on request |
| ウェブの厚さ | 4 mm規格 (3–10 mm across the range) |
| 使用荷重制限 | 1 t – 12 t single ply; 2 t – 24 二層 |
| バンド幅 | 25 mm – 300 mm, set by the working load limit and the safety factor |
| 安全係数 | 5:1 / 6:1 / 7:1, 注文時に選択された |
| ループの長さ | 0.5 メートル – 100 1 つの連続ループ内の m; minimum length rises with width |
| 伸長 | ≤ 7 % 使用荷重限界で (ポリエステル) |
| 使用温度 | −40℃～ +100 ℃連続; polyester melts at about 258 ℃, so sparks and hot work need a sleeve |
| 色 | BSEN 1492-1 capacity colour — 1 バイオレット, 2 グリーン, 3 黄色, 4 グレー, 5 赤, 6 ブラウン, 8 青, 10 オレンジ; OEM注文による特別な色と印刷されたロゴ |
| ラベル | 使用荷重制限, ループの長さ, 安全率, バッチ番号, customer reference; blue or white label |
| 規格 | BSEN 1492-1; ASME B30.9 for the 5:1 建てる; other market standards to order |
| パッキング | Bundled, cartoned or palletised, labelled per pack and listed on the packing list against the printed reference |
| HSコード | 630790 |
Choosing the size: the figure from the pick, the width from the surface
Two decisions are made separately and in this order. の 使用荷重制限 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. の 幅 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 | 使用荷重制限 | 幅 (5:1 / 7:1) | 一般的な使用方法 |
|---|---|---|---|
| まで 0.8 t | 1 t | 25 / 30 mm | 小口径チューブ, 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, 木材パック |
| 2.4 – 3.2 t | 4 t | 100 / 120 mm | Coated pipe 12–16″, シートパック |
| 3.2 – 4.0 t | 5 t | 125 / 150 mm | Heavy wall pipe, 機械, 石 |
| 4.0 – 4.8 t | 6 t | 150 / 180 mm | Pipe bundles, 構造セクション |
| 4.8 – 6.4 t | 8 t | 200 / 240 mm | Large bundles, コイル, 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 |
長さ: the two conventions, and why the mistake is expensive here
ループには、間を測定するための終端がありません。, 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, 交換する 2 番目のバンドなし.
| あなたは書きます | つまり、 | いつ使用するか |
|---|---|---|
| ループ周長 4.0 メートル | 負荷を一周する, 閉ループの周囲で測定 | バンドは既知の胴回りを巻くように注文されています |
| バンドの長さ 2.0 メートル, 平らに置いた | The webbing cut length before joining — half the circumference | バンドの価格はメーター単位でカットされます |
| ピック時の胴回り 1.6 メートル, 2 つのピック | 負荷自体の寸法, plus the number of bands | Safest form on a first order: 慣例はまったく必要ありません |
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.
| 配置 | 要素 | あ 5 tループは与える | 使用される場所 |
|---|---|---|---|
| Vertical — loop hangs, 片側に荷重をかける | 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 | パイプ, チューブ, poles, ドラム, バンドル |
| バスケット, 脚 0 ～ 45° | 2.0 | 10.0 t | Under a bundle with both legs carrying |
| バスケット, 脚 45 ～ 60° | 1.4 | 7.0 t | Wide bundles, short sling legs |
チョークはループを購入するためのアレンジメントです, そしてそれは費用がかかるものでもあります 20 % of the printed figure. あ 4.5 t パイプ束が詰まっている 5 t ループはオーバーロードです, not a margin — the answer is the next width up, not a longer band.
Coating and surface compatibility
| 表面 | Risk in the lift | Sling measure |
|---|---|---|
| Hot dip galvanised pipe | Zinc layer rubbed through by sliding hardware; white rust at a scored line | 無限ループ, 付属品なし, 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およびPEパイプ | Denting and ovality under a narrow band, especially in warm weather | 150–200 mm band, 2 つのピック, basket rather than a single choke on long joints |
| Stainless tube | Iron contamination and scratching from contact with steel fittings | Dedicated synthetic sling, 金属接触なし, 発行前にストレージをクリーンアップする |
| 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 |
マーキング, 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: the working load limit, the loop length with its convention, 安全率, and the reference the despatch actually uses — a batch, パック番号, 注文番号または独自の部品番号. That reference is what ties the band on a quay to the line on a packing list in an office.
- 旅行後にも読みやすい, 製造後ではない. Small, low contrast print on a face that enters the choke will not be read at the far end.
- 2 番目のチャネルとしてのカラー. 1色1パックタイプ, 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, バンドは木枠の中に詰めることができます, 静止画に縛り付けられるか、テープで束ねられる, パックごとにラベルが貼られている.
The single inspection, and what it looks at
A one trip band is checked once, 問題になっている, while a fault can still be replaced from the same consignment. Look at four things, この順序で: 負荷がかかる部分の織り方 (カット, 摩耗, つやのある顔、またはつねられた顔), ループが閉じる結合, the label — an unreadable figure cannot be matched to the pack it was cut for — and what the band has been lying in. グリット, 切りくず, 油と滞留水が接触部に侵入する, 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, 溶接または加熱
- 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, スリーブまたはパッド入りプロテクターを使用して、高温の表面と溶接スパッタを防止. その上 100 ℃, or where sparks are present, polyester is the wrong fibre and an エンドレスラウンドスリング 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, 検査台帳がない, no repair and no loss write-off — but it has to be counted correctly, because nothing comes back to cover a shortfall. パックから数えます, トン数からではない: パックあたり 2 つのピックは 2 つのバンドになります, a four point lift is four, ninety packs at two picks is 180 バンド. Add two to five per cent for the band cut while the pack is made up, したがって、不足分はドックでの遅延ではなく、注文のラインになります。.
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, ある 荷揚げネット is the article to price against it. The form with eyes at both ends, for loads that are hooked rather than wrapped, にあります 使い捨て一方向スリング ページ; the wider family is on the 使い捨てスリング そして single use lifting slings endless loop ページ.
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, 窒息またはバスケット, 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
荷物を送る, the pick positions, the girth and the factor. 幅を持って戻ってきます, ループの長さ, the finished weight and the marking — on a drawing, バンドが切れる前に.
Send your sling specification · Telephone / 微信 +86 180 6600 2268 · 702461526@qq.com
リフテ工業団地, 台州市, 江蘇省, China · HS code 630790
よくある質問
What is a one way webbing sling?
A rated polyester webbing sling supplied for a single journey. 荷重とともに移動します, 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?
いいえ. 繊維, 織ります, 幅, 安全率, working load limit and marking are specified exactly as for a returnable sling. 旅を表す言葉, グレードではない, 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. 幅は保護手段です: 帯域が広いほど, 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: 閉ループの円周, 結合する前の平置きしたバンドの長さ. 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?
はい, and a closed loop is the natural form for a choke on pipe, tube and bundles. 窒息した姿は 0.8 of the vertical working load limit, それで 5 Tループチョーク 4 t. Select the width for the arrangement actually used.
どの安全係数を注文すればよいか, 5:1, 6:1 または 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, そして 6:1 彼らの間に座ります. 係数が異なると同じトン数でも、幅が異なる別の製品になります。, したがって、要因は問い合わせに属します.
独自のリファレンスを使用してバンドを印刷できますか?
はい. 使用荷重制限, ループの長さ, 安全率, 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.