Code of practice long link chain used for entertainment rigging 2

Transcript

1 Code of practice for the safe use of long link chain as a means of adjusting rigging in the entertainment industry. This document was produced by: The Health and Safety Executive was consulted in th e production of this publication. It endorses the sensible, proport ionate, reasonable and balanced advice to riggers and managers of loca tions and events, concerning the use of long link chain set out in th is guidance.

2 Introduction The requirement in the European Machinery Directive that lifting chain shall be short link caused entertainment rigging. This code of practice confusion about the use of long link chain used in aims to clarify the legal position and provide guid ance on selection and safe use. Scope s guidance on selection, marking, storage, This code states the legal requirements and provide suitable for use in entertainment rigging. inspection and safe use of grade 8 long link chain Definitions For the purposes of this document, the terms and de finitions in given in BS EN 818-1 and the following apply. Long link chain Long link chain is chain having a pitch dimension c onsiderably in excess of 3 x nominal ) of the chain. For the purposes of the code it is in the range 6d – 7.6d diameter (d n n n Deck chain A deck chain is a short length of long link chain. The length is variable but is typically 5ft /1.5m. Another term for deck chain is boat chain. Legal requirements The accepted use for long link chain in the enterta inment industry is as a structural element loaded only in straight pull. It is not used as a l ifting accessory in the way defined by the Machinery Directive. The UK Health and Safety Execu tive have agreed that provided it is of an ng link chain can continue to be used as the acceptable quality and used only in this manner, lo most appropriate engineering solution for this appl ication. Selection of long link chain should have appropriate dimensions and be of Long link chain suitable for entertainment rigging a suitable quality. There is no national or interna tional standard specific to this type of chain. However the European standard for grade 8 short lin k chain can be adapted for this purpose. The following specification has been agreed between the major manufacturers and should be specified when purchasing new chain. It may also be used to assess chain already in service. Chain specification The chain to be in conformity with EN 818-2 except there will be a single size as follows: Table 2a – Dimensions Dimensions in millimetres 1 2 3 5 6 7 8 4 Internal Pitch External Nominal Weld Material width width over size diameter diameter p p p n away the weld tolerance d d n s max min from weld w max 2 w max 1 min 13 ± 0,52 15 98,8 78 22,1 52

3 Table 5a – Working load limits and test requirement s 2 3 5 1 4 Working load Manufacturing Breaking force Nominal size, d Bend deflection n limit proof force mm BF f WLL MPF kN mm t kN min min 5,41 13 212 1,5 133 The total ultimate elongation shall be not less tha n 15% : Note columns 3 to 8 are as follows: The bases for calculation of dimensions in table 2a = 1,15 d Maximum diameter at weld d s max n Nominal pitch Not specified = 6 d Minimum pitch of chain p min n Maximum pitch of chain p = 7.6 d n max Minimum internal width, away from the weld w = 1,7 d n 1 w = 4 d Maximum external width, over the weld 2 n Dimensions given in table 2a are full calculated va lues rounded to 0,1 mm. Chain rating duced by 50% to provide a minimum When used in overhead rigging, the WLL should be re factor of safety of 8:1. Marking r the manufacturer’s mark. Each deck chain length must be identifiable and bea Storage When not in use, deck chains should be returned to proper storage. The storage should be dry, free from injurious pollution and extremes of tempe rature. They should not be left in an area where other activities might cause them to be damag ed. Inspection and marking of long link chain Periodic Inspection Long link chain is not a lifting accessory but it i s work equipment and therefore subject to the ailure are similar to those of lifting inspection requirements of PUWER. As the risks of f accessories, it is recommended that the examination and inspection regime for deck chains is the same as that used for lifting accessories, ie t hat required by Regulation 9 of LOLER. The user should have a means of verifying that the deck chain has been inspection within the required period and found fit for service, eg colou r code, access to inspection report. This inspection should be carried out by a competen t person. The deck chain should be in a reasonably clean condition and the inspection carri ed out in adequate lighting. If any of the following faults are present, the deck chain should be withdrawn from service: (1) Illegible markings; (2) Stretched chain; if there is any visible narrowing of the link or any lack of free articulation between the links. See figure 1 below.

4 (3) Bent or twisted links; Cuts, nicks, gouges, cracks, excessive corrosion or heat discolouration. (4) (5) Wear at the interlink seats; Correct shape of link. Narrowing of link indicates s tretch due to overload. Withdraw from service. Figure 1 Pre-use Inspection Each deck chain should be inspected prior to use to check that it is not damaged. Exceptional circumstances ading should be taken out of service and Long link chain that has been subjected to shock lo gain. inspected by a competent person before being used a Safe use of long link chain Use of long link chain should be planned and superv ised by a competent person, in accordance of practice. with the manufacturer’s instructions and this code Long link chain may be used in the following entert ainment rigging situations in accordance with the manufacturer’s instructions: • Providing adjustment in bridle legs used ‘above the hook’ (supporting the hoist). • As a means of making secondary suspensions taut. Providing adjustment in other rigging assemblies. • Long link chains must be used: • ‘In-line’ only and not passed around any object. • Without twisting any links. • Without side loading or stretching any link. • Without trapping ‘dead’ links under shackles or hoo ks. Long link chain should never be used as a sling in either ‘basket’ hitch or choked configuration. Neither should it be used in any situation where a link may be subject to bending or twisting forces or where the chain may suffer shock loading. Unused links should not be trapped under shackles that connect the chain to other equipment. Long link chain should only be used below the lifti ng machine in exceptional circumstance and only when this use has been agreed by a competent p erson.

5 SAFE USE OF LONG LINK CHAIN IN ENTERTAINMENT RIGGIN G

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