【AS澳大利亞標(biāo)準(zhǔn)】AS 1666.2-2009 Wire-Rope Slings - Part 2 Care and Use.doc

as 1666.22009as 1666.22009australian standardwire-rope slingspart 2: care and usethis australian standard was prepared by committee me-025, lifting tackle. it was approved on behalf of the council of standards australia on 20 november 2008.this standard was published on 2 april 2009.the following are represented on committee me-025:australian businessaustralian chamber of commerce and industryaustralian forging groupaustralian industry groupaustralian maritime safety authoritycrane industry council of australiadepartment of defence (australia)engineers australiainstitute of quarrying australianational association of testing authorities australiavictorian workcover authorityworkcover new south walesthis standard was issued in draft form for comment as dr 08124.standards australia wishes to acknowledge the participation of the expert individuals that contributed to the development of this standard through their representation on the committee and through the public comment period.keeping standards up-to-dateaustralian standards are living documents that reflect progress in science, technology and systems. to maintain their currency, all standards are periodically reviewed, and new editions are published. between editions, amendments may be issued.standards may also be withdrawn. it is important that readers assure themselves they are using a current standard, which should include any amendments that may have been published since the standard was published.detailed information about australian standards, drafts, amendments and new projects can be found by visiting .authe standard is downloaded from standard sharingstandards australia welcomes suggestions for improvements, and encourages readers to notify us immediately of any apparent inaccuracies or ambiguities. contact us via email at .au, or write to standards australia, gpo box 476, sydney, nsw 2001.as 1666.22009australian standardwire-rope slingspart 2: care and useoriginated as part of as b2861970. revised and redesignated as 16661976.revised and redesignated in part as as 1666.21995. second edition 2009.copyright standards australiaall rights are reserved. no part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher.published by standards australia gpo box 476, sydney, nsw 2001, australiaisbn 0 7337 9062 33as 1666.22009prefacethis standard was prepared by the standards australia committee me-025, lifting tackle, to supersede as 1666.21995.the other standard in this series covering wire-rope slings is as 1666.1, wire rope slings, part 1: product specification.the objective of this standard is to provide guidance for the safe use of wire-rope slings for reference by users and regulators.this revision includes the following changes:(a) revision of the definition of wll and deletion of safe working loads from any part of the standard.(b) cognizance of en 13414.2, steel wire rope slingssafety, part 2: specification for information for use and maintenance to be provided by the manufacturer, and the adoption of some of its requirements.(c) modification of the deration previously required for interfacing of eyes with pins of less than two diameters.the terms normative and informative have been used in this standard to define the application of the appendix to which they apply. a normative appendix is an integral part of a standard, whereas an informative appendix is only for information and guidance.the standard is downloaded from standard sharingstatements expressed in mandatory terms in notes to tables are deemed to be requirements of this standard.contentspage1scope .4 2normative references . 43definitions. 44guide for use of ropes . 45receipt of slings. 46storage . 47care during use . 58limitations for use . 59working load limit (wll). 1010inspection of slings. 1311types of damage . 1412discarding slings . 14appendicesastandards for components used in lifting systems . 16bguidance for the design of engineered lifts . 17cworking load limits for slings with ferrule-secured eyes . 1817as 1666.22009the standard is downloaded from standard sharingstandards australiaaustralian standardwire-rope slingspart 2: care and use1 scopethis standard sets out practices for the care and use of wire-rope slings under general conditions of use.note: standards for components used in lifting systems are listed in appendix a.2 normative referencesthe following documents are indispensable to the application of this standard: as1418cranes (including hoists and winches)1418.1part 1: general requirements1666wire-rope slings1666.1part 1: product specification2759steel wire ropeuse, operation and maintenance3569steel wire ropes3 definitionsfor the purpose of this standard, the definitions given in as 1666.1 apply.4 guide for use of ropesselecting, handling, storing, lubricating, inspecting and discarding steel-wire ropes shall be in accordance with as 2759.5 receipt of slingsas soon as a sling is received, it should be unpacked and checked for any evidence of corrosion and physical damage.6 storageprior to storage, slings shall be examined to determine whether they are sufficiently lubricated.slings should not be stored on the ground, even for short periods. slings shall be stored on well-ventilated racks or supports where they are not subjected to deterioration or other types of damage. the racks or supports shall be of material that will not cause corrosion of the wire rope and located above the floor and away from damp areas, humid atmosphere, corrosive fumes, sprays, dust, excessive heat, and locations where they could be damaged by moving equipment or falling objects.during relatively long periods of storage, slings shall be periodically (a)examined for any sign of deterioration; standards a.au(b) repositioned in different orientations, to assist the lubricant to remain distributed through the wires in the rope; and(c) lubricated whenever the sling contains insufficient lubricant to protect the wires in the rope from corrosion (a loss of lubricant may occur during storage).7 care during useslings are prone to damage. they are weakened by broken wires, corrosion, chemical attack, overheating, wear, physical abuse, overloading, kinking and flattening of eyes.safety in the application and use of wire-rope slings can be achieved by taking the following precautions:(a) select materials and types of sling that are suitable for the application. (b)examine slings prior to use.(c) do not overload slings. (d)do not abuse slings.(e) when applying a choke hitch, allow the angle of choke to form naturally, without being hammered.(f) protect ropes against damage from sharp corners or projections around which they pass. bends having a radius of less than the diameter of the rope will cause permanent damage to the rope.(g)protect terminations against damage from sharp corners and projections. (h)avoid loading terminations in a non-axial manner (see item 9(j).8 limitations for usethe following limitations apply to the use of slings and sling assemblies, typical examples of which are illustrated in figures 1 to 13:(a) splices in ropes shall not be bent around corners or edges, whether sharp or curved and shall be in the free length of the sling.(b) the inside radius of any bend in a wire rope around a corner of a load (i.e. except at the point of reeving of choke hitches) shall be not less than(i) the rope diameter where the included angle of the bend in the rope is more than90 five times the rope diameter where the included angle of the bend in the rope is not more than 90 see figure 1(b).figure 1 minimum inside radii of wire ropesthe standard is downloaded from standard sharing(c) where an endless sling or a soft eye of a sling interfaces with a fitting(i) the supporting surface of the fitting shall have a diameter of not less than the rope diameter; and(ii) where the diameter of such a supporting surface is less than 1.5 rope diameters, the sling shall be derated by 25% in accordance with item (m) of clause 9.(d) reeved slings shall not support a load while they have an angle of choke (nip angle)exceeding 120 (see figure 2).(e) where a two-leg sling or two single-leg slings are secured by a single-wrap choke hitch, the angle between the legs shall not exceed 45 (see figure 7).(f) where a two-leg sling or two single-leg slings are each wrapped twice around the load and secured by a choke hitch, the angle between the legs shall not exceed 60 (see figure 8).(g)the angles between the legs of slings in a single-wrap basket hitch shall not exceed45 (see figure 9).(h) the angles between the legs of slings in a double-wrap basket hitch shall not exceed60 (see figure 10).(i) the angles from the vertical to each of the legs of multi-leg slings shall not exceed60 (see figures 11 to 13).(j) where multi-leg slings are connected to a crane hook, they should be connected by an intermediate component so that the load is supported axially through the crane hook (see figures 9 to 13).(k)a saddle of a hook should not support more than two sling legs.(l) the latch mechanism of a hook shall not support any force while the hook is supporting a load.(m)use of slings is limited by the temperature and provisions of table 1 shall apply. account should be taken of the maximum temperature that can be reached by the wire ropesling in service. this is difficult in practice but underestimation of the temperature shouldbe avoided.table 1 summarizes the necessary de-rated working load limits of a sling due to temperature, taking into account the type of rope termination, the ferrule material and the core of the rope.the use of wire rope slings within the permissible temperature ranges given in table 1 does not require any permanent reduction in working load limit when the rope is returned to ambient temperature.wire rope slings will not be adversely affected by temperatures down to 40c; therefore, reduction from the working load limit is necessary on this account. where wire rope slings are to be used at temperatures below 40c the manufacturer should be consulted.table 1de-rated working load limit (wll) of slings due to temperaturetermination typeferrule materialrope corede-rated working load limit expressed as % of wll of the slingtemperature, t, c40t100100t150150t200200t300300t400400tturn-back eyealuminiumfibre100do not usedo not usedo not usedo not usedo not useturn-back eyealuminiumsteel100100do not usedo not usedo not usedo not useflemish eyesteelfibre100do not usedo not usedo not usedo not usedo not useflemish eyesteelsteel100100907565do not usehand splicefibre100do not usedo not usedo not usedo not usedo not usehand splicesteel100100907565do not usefigure 2 use of protective packingfigure 3 simple choke hitch around a round loadfigure 4 simple choke hitch around a rectangular loadfigure 5 double-wrap choke hitchthe standard is downloaded from standard sharingfigure 6 doubled-choke hitch figure 7 two single-leg slings used in a choke hitchfigure 8 two single-leg slingsused in a double-wrap choke hitchfigure 9 two single-leg slings used in a basket hitchfigure 10 two single-leg slingsused in a double-wrap basket hitchfigure 11 two-leg slingfigure 12 three-leg sling figure 13 four-leg sling9 working load limit (wll)slings shall not be used to lift a load that exceeds the wll of the sling for the particular conditions of use. the wll of the sling shall be consistent with the method of lift and reeving, and allow for any excessive dynamic load effects and any abnormal or severe working condition.the wll of a sling assembly shall be calculated from the following equation: wll = rc rt ro p/(5 9.81)whererc= factor for the particular configuration (see table 2)rt= factor for the particular termination (see table 3)ro= factor for the other derations that apply for the particular lift (see items (b), (c), (j), (k) and (l) below).p = minimum breaking force as specified for the particular rope in as 3569, in kilonewtonsthe standard is downloaded from standard sharingwhere the configuration is not covered by the label, users shall always consult a sling load chart. appendix c gives sling load charts for slings fitted with ferrule-secured eyes.the wll for each application of a wire-rope sling shall comply with the following:(a) general use general conditions of use are equivalent to a group classification of crane mechanisms of m3 as specified in as 1418.1. under general conditions of use, the wll of a sling is normally equal to the wll.(b) non-general use under other than general conditions of use (e.g. severe conditions, hazardous conditions, directly supporting personnel), the wll shall be determined by the group classification of crane mechanisms as specified in as 1418.1 for the conditions of use that apply. under specified or unusual conditions of use (e.g. a high-temperature environment, handling dangerous substances), the use of a derating that is greater than the relevant derating specified in as 1418.1 may be required.(c) engineered lifts where an engineered lifting situation exists that uses slings that are designed for a special purpose, such as large slings that are individually designed and incorporated into an engineered lift, it may be acceptable to use lower factors of safety than those specified for general use under item (a) above.note: a guide for the design of engineered lifts is given in appendix b.where an engineered lift is employed, an appraisal shall be undertaken by a competent person, who shall consider both the lifting apparatus and the lifting procedure that is proposed.(d) grommet and double-part sling legs the wll of each grommet (that is not a cable- laid grommet) and each double-part sling leg shall be in accordance with table 2 and table 3.(e) non-vertically orientated leg of a sling the wll of a non-vertically oriented leg of a sling shall allow for its inclination to the vertical.(f) multi-leg slings the wll of a general purpose multi-leg sling (i.e. a sling assembly comprising two or more legs) shall be not more than that calculated for only two of its legs to support a load having a symmetrical configuration with an included angle between the two legs of 60.the wll for a multi-leg sling having an included angle of 60 between the legs shall not be exceeded, even when the included angle between the legs is less than 60.the included angle between the legs of a multi-leg sling shall not exceed 120.the wll of lifting components of a multi-leg sling shall be considered when determining the wll of the sling assembly.(g)reeved slings the wll of reeved wire-rope slings shall be not more than x times the wll of the wire rope, where(i) for round loads, x = 0.75; and(ii) for other than round loads, x = 0.5.(h) sling assemblies where components are attached to wire rope to make up sling assemblies, the wll of each component shall be compatible