BRITISH STANDARD BS AU 161 1b 1983 BS AU 161 1 1983 renumbered incorporating Amendments No 1 and No 2 Vehicle lifts — Part 1b Specification for fixed lifts BS AU 161 1b 1983 This British Standard, hav[.]
BRITISH STANDARD BS AU 61 -1 b:1 983 BS AU 61 - :1 983 renumbered incorporating Amendments No and No Vehicle lifts — Part b: Specification for fixed lifts BS AU 61 -1 b:1 983 Committees responsible for this British Standard This Britis h S tandard was p ub lished under the direction of the Mechanical E ngineering S tandards C ommittee ME E /- Its p rep aration was entrusted to Technical C ommittee ME E /1 82 up on which the following b odies were rep resented: As s ociated O ffices Technical C ommittee As s ociation of Loading E quip ment Manufacturers Britis h Work Platform Ass ociation C ons truction Plant- hire Ass ociation D ep artment of Indus try, Mechanical E ngineering E lectricity S up p ly Indus try in E ngland and Wales Federation of Wire Rop e Manufacturers of Great Britain Garage E quip ment As s ociation H ealth and S afety E xecutive London Transp ort E xecutive Post O ffice This Britis h S tandard, having b een p rep ared under the direction of the Mechanical E ngineering S tandards C omm ittee, was p ub lis hed under the authority of the Board of BS I and comes Amendments issued since publication into effect on July 983 Amd No D ate of is s ue 45 05 Ap ril 984 92 46 January 99 C omments © BS I 02 - 99 Firs t p ub lis hed, as p art of BS AU , Ap ril 73 Firs t revis ion as BS AU - July 983 ISBN 80 328 Indicated b y a s ideline in the margin BS AU 61 -1 b:1 983 Contents Page C ommittees res p ons ib le Ins ide front cover Foreword ii S cop e D efinitions General requirements S p ecial requirements Ins tructions for installation, maintenance and examination Ap p endix A Recommendations for ins tallation Ap p endix B Recommendations for maintenance and examination Ap p endix C Recommendations for the safe us e of lifts in s ervice Figure — S urface- mounted lift Figure — Flus h- mounted lift Figure — Reces sed lift, drive- through ap p lication Figure — Reces sed lift, b ack- off ap p lication Figure — Axle and chass is s up p orting lift Figure — O verb alance typ e Figure — S trut- s up p orted typ e Figure — Layout for certificate for tes ting Figure — Link p late dep th 11 Tab le — Wire rop e dis card criteria 10 Tab le — C hain extens ion criteria 11 Pub lications referred to © BS I - 99 12 Ins ide b ack cover i BS AU 61 -1 b:1 983 Foreword This British Standard has been prepared under the direction of the Mechanical Engineering Standards Committee after consultation with the Automobile Standards Committee, as a result of requests from industry, and has been based on proposals from the Society of Motor Manufacturers and Traders BS AU 61 was originally published in 973 and dealt with both fixed lifts and mobile lifts It has been decided to publish the revised standard in two Parts: Part “Fixed lifts” and Part “Mobile lifts” (in course of preparation) It is intended to defer withdrawal of BS AU 61 : 973 until Part of this revision also is published This Part of this standard sets out various performance requirements that are intended to ensure that vehicle lifts have an adequate performance and are safe in operation In particular, it is hoped that inadvertent operation of the lifts will be prevented by the use of the “dead man” type of control, which requires a positive action by the operator to lower the lift Particular attention is drawn to the fact that heavy vehicles (above tonnes) should be manually chocked, because experience has shown that once such vehicles are set in motion, their motion cannot be successfully arrested by the automatic chocks provided In order to help users operate their lifts safely, recommendations on installation, maintenance and examination, and on the safe use of lifts in service have been included in Appendix A, Appendix B and Appendix C, respectively A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application Compliance with a British Standard does not of itself confer immunity from legal obligations Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages to 2, an inside back cover and a back cover This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover ii © BSI 02- 999 BS AU 61 -1 b:1 983 Scope This British Standard specifies requirements for the performance of fixed vehicle lifts General requirements 3.1 Factor of safety 3.1 All lifts shall be capable of statically supporting an applied load of 25 % above the design load without permanent deflection or failure of any part In the case of wheel-supporting lifts, the runways shall be capable of supporting a static load of 25 % above the design load specified for each Definitions wheelbase shown on the marking plate (see 3.1 ) A type test of the lift with the above-mentioned For the purposes of this Part of this British applied load shall be carried out by the Standard the following definitions apply manufacturer 2.1 3.1 Load-bearing mechanical vehicle lift parts not referred to elsewhere shall not be a fixed appliance that is designed to raise the whole stressed to more than one-thirdinof3.1 the tensile of a vehicle to a height of not less than 0.5 m and not strength of the material Where any mechanical more than 2.0 m, and that is designed to be used part is subjected to shock loading the static factor of solely for the purpose of examining and working on safety shall be not less than : the vehicle while in a raised position Each wire rope shall be capable of NOTE Lifts or hoists for the use or transference of vehicles, 3.1 supporting its design load with a factor of safety of goods, materials or persons from one level to another are not covered by this definition not less than : 1, based on the minimum breaking NOTE The vehicle lifts are of the wheel-, axle- or load of the rope Sheaves and drums shall be frame-supporting type and: provided with adequate rope retainers Each rope a) of the single- or multi-ram type; shall be issued with a test certificate such as b) of the single- or multi-post type 1) NOTE The vehicle lifts are powered by the following means: Form 87 a) hydraulic, including both fully- and semi-hydraulic 3.1 Each chain shall be capable of systems; supporting its design load with a factor of safety of b) pneumatic; not less than : 1, based on the calculated breaking c) mechanical; load of the chain d) electrical; NOTE Recommendations for the installation, maintenance and safe use of lifts in service are included in Appendix A, Appendix B and Appendix C NOTE The titles of the publications referred to in this standard are listed on the inside back cover General Mechanical p arts Wire rop e Chains e) manual; f) or any combination of a) to e) NOTE Breaking loads for leaf chains are given in BS 5594 Each chain shall be issued with a test certificate such as Form 972) design load 3.1 The strength of each the load that a lift complying with the requirements termination shall be at least 80 % of that of the rope or chain of this standard has been designed to carry (see 3.1 ) 3.1 All rams, cylinders and associated pipework and fittings shall 2.3 be capable of withstanding a pressure of twice the safe working load design pressure without permanent the load for which a lift has been certified (see A.5 ) maximum distortion or failure 2.4 All pressure hoses and their associated fittings shall maximum design pressure be capable of withstanding a pressure of four times the hydraulic or pneumatic pressure corresponding the maximum design pressure without permanent to the design load (2.2 ) distortion or failure 3.2 Holding the load Every lift shall be capable of holding its design load as soon as lifting ceases If the internal friction of the drive is insufficient for this purpose, a suitable automatic brake shall be provided 2.2 Term inations Hydraulics and p neum atics 1) H and SE Form 87 is obtainable from HMSO 2) H and SE Form 97 is obtainable from HMSO © BSI 02-1999 BS AU 61 -1 b:1 983 3.3 Electrical equipment All electrical Where a wheel- supporting lift is installed to allow equipment and wiring supplied with the lift shall approach and from end only, the opposite end shall comply with the requirements of the relevant be provided with automatic chocks as already British Standards specified or permanent chocks NO TE The width of automatic or permanent chocks shall Account has to b e taken of the current IEE “Regulations for the E lectrical Equipment of Buildings” 3) and the requirements of the local authority in whose area the lift is installed 3.4 Control means The control device for raising and lowering the lift shall be of the type that automatically returns to the “off” or “neutral” position when released by the operator and shall be extend from a point not more than 70 mm from the inner flange of the runway to a point not more than 70 mm from the outer flange, measured on the flat The part of the chocks that first comes into contact with the tyre shall b e not less than 00 mm high so designed that the “dead man” feature cannot be Automatic and permanent chocks shall be capable of readily overridden The control device shall be of arresting any unpowered movement of vehicles with such a type, or be so positioned, that it cannot be a mass equivalent to the design load of the lift inadvertently operated NO TE The direction of movement of the lift shall b e indicated by arrows on the control device Where this device is a lever operating in the vertical plane, it shall be constructed in such a way that the up movement raises the lift and the down movement 3.6.2 Lifts with a design load above tonnes Portable chocks shall be provided that are capab le of preventing any unpowered movement of the vehicle, once it is positioned on the lift, when the chocks are placed in front of and b ehind at least one of the lowers the lift Adequate operating instructions shall be given clearly on a plate attached to the lift NO TE Manual chocks may b e used in addition to or in comb ination with automatic chocks In common with other “dead man” controllers, the return of the handle to the “off” position will initiate action to bring the lift to a halt, but this does not imply that the lift will b e ab le to stop instantaneously In the case of semi- hydraulic lifts, the control handle should always b e held in the down position when the lift is returned to the ground until all pressure is exhausted from the system C ontrols should b e so situated that the operator has a clear view of the space b eneath the lift b efore descent commences wheels of the vehicle 3.7 Ramps The angle or slope of the approach and departure ramps shall not exceed 0° from the horizontal Hinged ramps shall, when the lift is fully lowered, b e capable of lifting so as to provide at least the minimum toe clearance specified in 3.8 3.8 Toe clearance 3.8.1 General Toe clearance as describ ed in 3.8.2 3.5 Rate of descent Every lift shall b e equipped and 3.8.3 shall b e provided along the outer edge of with a device that in the event of failure of the lifting exposed moving structures not normally covered by mechanism will prevent the lift from descending at the vehicle a rate greater than m/s when carrying its design load The ram assembly of a hydraulic lift shall include an orifice or other restriction to control the transfer of hydraulic fluid so that, in the event of a failure of the 3.8.2 Wheel-supporting lifts 3.8.2.1 Surface-mounted lifts Toe clearance shall b e provided by a minimum clearance space, as shown in Figure , of mm × mm hydraulic piping which feeds the ram or cylinder, 3.8.2.2 Flush- mounted lifts Toe clearance shall b e the lift will not descend at a rate greater provided b y hinged flaps, as shown in Figure , of at than m/s when carrying its design load least mm width The flaps shall not b e capable of b eing rotated below the horizontal or by more 3.6 Chocks than 75° in the upward direction After rotation, the 3.6.1 Lifts with a design load of up to and flaps shall return to the horizontal position including tonnes Where a wheel- supporting lift is automatically These flaps shall b e capable of installed to allow approach and departure from withstanding the loads that are encountered in either end, automatic chocks, at least two at each normal practice end of the lift, shall b e provided at the approach and departure ends of wheel- supporting runways and they shall automatically rise into position in the first 300 mm of ascent and shall not retract automatically before the last 3) 300 mm of descent Published by and obtainab le from the Institution of E lectrical E ngineers, Savoy Place, London WC R 0BL © BSI 02 - 999 BS AU 61 -1 b:1 983 3.8.2.3 3.8.2.3.2 Reces sed lifts 3.8.2.3.1 Alternative : drive- through ap p lication (see Figure 3) Toe clearance shall be provided by b ack- o ff (see Figure 4) Toe clearance shall be provided by having: a) a minimum space of 20 mm between the having: a) a minimum space of 20 mm between the exposed end of the moving structure and the recess end wall together with a clearance space, as specified in 3.8.2.1 , below the moving exposed end of the drive- on end of the moving structure and the recess end wall together with a clearance space, as specified in 3.8.2.1 below the moving structure; b) a minimum space of 300 mm between the structure; b) a minimum space of 300 mm between the exposed outer side of moving runways and the recess side wall together with a clearance space, as specified in 3.8.2.1 , below the moving runways Alternativ e 2: driv e- o n, ap p licatio n exposed end of the dead end of the moving structure and the recess end wall together with a clearance space, as specified in 3.8.2.1 below the moving structure; c) a minimum space of 300 mm between the exposed outer side of moving runways and the recess side wall together with a clearance space, as specified in 3.8.2.1 below the moving runway NOTE The dead end of the lift can be positioned in close proximity to a flush vertical wall providing the recommendations given in A.2 on positioning are followed Figure — Surface-mounted lift Figure — Flush-mounted lift © BSI 02- 999 BS AU 61 -1 b :1 983 NO TE Plan and sections have different scales All dimensions are minima and expressed in millimetres Figure — Re cesse d lift, drive -through app lication © BSI 02 - 999 BS AU 61 -1 b: 983 NO TE Plan and sections have different scales All dimensions are minima and expressed in millimetres Figure — Recessed lift, b ack-off app lication © BSI 02 - 999 BS AU 61 -1 b:1 983 3.8.3 Axle- and chassis-supporting lifts Toe clearance shall be provided by a minimum clearance space of 20 mm × 50 mm around the area of the lifting arm supporting carriage and that part of the arm not normally covered by the vehicle, excluding the area between the lifting arms as shown in Figure 3.9 Guard rails The periphery of the personnel area of balcony- type lifts (except for the designed personnel access area) shall be provided with permanent guard rails 3.1 Warning notices All balcony- type lifts shall show the words “RIDING ON THE PLATFORM IS FORBIDDEN” adj acent to the access ladder, in letters not less than 50 mm high 4.2 Mechanical lifts 4.2.1 Limits of travel Every mechanical lift shall have a device that automatically stops the driving mechanism when the superstructure reaches its designed limits of travel 4.2.2 Fail safe device Any mechanical lift employing a drive screw, where the wear of, or damage to, the carrying nut could cause the whole superstructure to tilt or descend, shall be equipped with a device which, in the event of failure of the carrying nut, takes the load off the carrying nut and prevents further use of the lift after it has been lowered 4.3 Wire rope or chain operated lifts Every wire rope or chain operated single or multiple post lift shall be equipped with effective safety devices which In the case of wheel- supporting lifts having a design will support the moving structure with its design load of more than tonnes, a notice shall be load in the event of the slackening or a breakage of attached to the lift stating “MANUAL CHOCKS the ropes or chains or of any of their attachments SHALL BE USED” 3.1 Marking Each lift shall show the safe working load expressed in tonnes or kilograms in a conspicuous place, in letters not less than 50 mm high Each lift shall carry a plate showing the 4.4 Axle or chassis supports 4.4.1 Material All supports, except those subj ected to compression stresses only, shall be constructed of structural steel or suitable non- brittle material manufacturer’s name and lift identification and 4.4.2 Overbalance type Axle or chassis supports design load consisting of an overbalance- type adaptor or pad, In addition, each wheel- supporting lift shall carry a plate specifying the wheel spacings for given working loads Each hydraulic and each pneumatic lift shall carry a plate showing the maximum design pressure in bars 3.1 Ancillary equipment Ancillary equipment designed to be used with the lift shall comply with the requirements of the relevant clauses of this standard Special requirements 4.1 Hydraulic and pneumatic lifts which can be erected or rotated above the hinge or pivot, shall be positioned, when fully erected, at a minimum angle of 05° from the plane of the retracted position as shown in Figure 4.4.3 Other types Adaptors or pads not of the overbalanced type shall be positioned not more than 75° from the plane of the retracted position and shall be supported by a strut, or other suitable means, in any position (except the fully retracted position) as shown in Figure 4.4.4 Adjustable arms All pivoted j oints on adj ustable arms shall be secured automatically in all working positions 4.5 Multi-ram axle-supporting lifts This type of 4.1 Venting Means shall be provided for venting, lift shall have only one fixed ram The other rams from hydraulic circuits, entrapped air that can shall be adj ustable to allow for changes in interfere with the safe operation of the lift wheelbase, and be capable of moving longitudinally 4.1 Storage vessels All vessels for storing liquid or during lifting air under pressure shall be designed and 4.6 Multiple wheel-supporting lifts Where two manufactured in accordance with the requirements or more wheel- supporting vehicle lifts are designed of BS 5500 or BS 51 69, as appropriate to lift one vehicle, they shall be automatically 4.1 Testing Where a hydraulic or pneumatic synchronized so that at all times their height does circuit is assembled or reassembled on site, the lift not differ by more than 40 mm shall be subj ected to the maximum design pressure of the system and the assembly examined for leakage © BSI 02- 999 BS AU 61 -1 b: 983 Instructions for installation, Recommendations for ins tallation are given in maintenance and examination Ap p endix A With every lift, the manufacturer shall p rovide ins tallation ins tructions for the installer, and maintenance ins tructions The maintenance ins tructions shall include details of a p eriodical Recommendations for maintenance and examination are given in Ap p endix B Recommendations for the s afe use of lifts in s ervice are given in Ap p endix C s ervicing ins p ection and examination p rocedure Figure — Axle and chassis supp orting lift Figure — O ve rb alance typ e © BS I - 99 Figure — S trut-supp orted typ e BS AU 61 -1 b:1 983 Appendix A Recommendations for installation Lifts should only be installed according to the manufacturer’s instructions by a competent person A.2 Positioning Lifts should be positioned so that throughout their range of movement any moving part is at least 600 mm away from the nearest fixed structure If this is not possible the lift should be positioned so that any moving part is not more than 12 mm away from any adjacent vertical structure throughout the movement of the lift and not less than 600 mm away from any other adjacent fixed structure throughout the movement of the lift Where a lift is installed adjacent to any other equipment which moves vertically, the clearance between the equipment and the lift should be at least 600 mm Consideration should be given prior to installation to the position of adjacent doorways and other possible hazards A.3 Water separator Where compressed air is used to control hydraulic lifts, an automatic water separator should be incorporated in the air supply line A.4 Marking of floor The floor should be marked clearly for a distance of 300 mm from the edges of the recess (see Figure and Figure 4) Marking should be by 100 mm wide stripes on a 300 mm pitch angled at 45° and painted yellow to colour 08-E51 of BS 4800:1981, taking account of the Safety Signs Regulations 1980 (see also BS 5378-1) A.1 General A.5 Testing after installation Vehicle lifts should be tested by a competent person following completion of the installation and before being taken into service The tests should be carried out throughout the full travel of the lift and at the design load or at a lesser load as agreed with the user A.5 The user should arrange for the provision of a suitable test load and in selecting this test load due attention should be given to the load/wheel spacing data stated on the plate attached to the lift (see 3.1 ) A.5 The competent person should provide the user with a test certificate for the lift A layout for a test certificate is shown at A.5 A.5 All safety devices should be checked for safe operating in accordance with the manufacturer’s instructions A.5 A.5.5 After the test has been carried out and the test certificate presented, the lift should be marked (see 3.1 ) with the “safe working load” The safe working load may be equal to the certified test load, but whenever practicable the certified test load should be 110 % of the safe working load A.5.6 In the event of replacement or major repair to the load-carrying components of the lift or the re-installation of a lift or change of the rating of the lift, the lift should be tested before re-commissioning and a new test certificate provided A.5.7 The layout for the certificate for testing after the installation of a vehicle lift is shown in Figure Appendix B Recommendations for maintenance and examination B.1 General Every vehicle lift should be maintained in accordance with the manufacturer’s instructions Every vehicle lift should be examined thoroughly every six months by a competent person, and a register kept recording the details of each examination All pressure vessels used solely for the operation of a lift should be thoroughly examined by a competent person once in every period of twenty-six months or in accordance with relevant legislation Every hydraulic ram and cylinder buried in the ground should be hydraulically pressure tested to 1.5 times the maximum design pressure once in every four years Failure to hold this pressure for a period of 15 to within % of the initial pressure will require the removal of the ram and cylinder for further examination B.2 Wire ropes All wire ropes, terminations and attachments are required to be thoroughly examined by a competent person at least once in every period of six months or in accordance with relevant legislation The purpose of this examination is to determine the physical condition of the rope and to assess the condition in relation to future use The competent person may require the rope to be renewed if it is thought to be unsafe for further use NOTE A British Standard code of practice on this subject is in course of preparation and will be based substantially on ISO 4309 “Wire ropes for lifting appliances — Code of practice for examination and discard” Before carrying out the examination of the wire ropes they should be cleaned thoroughly If it is not possible to examine the whole of the ropes while in situ, then it will be necessary for them to be removed for examination © BSI 02-1999 BS AU 61 -1 b:1 983 Figure — Layout for certificate for testing © BSI 02 - 999 BS AU 61 -1 b:1 983 In deciding the condition of a wire rope, the B.3 C hains following factors should be used as a guide: NOTE a) the nature and number of visible wire breaks (see Table ); Only leaf- type chains complying with BS 5594 are recommended for use as a load- carrying chain in vehicle lift applications and, therefore, this guide covers only this type of chain construction b) wire breaks at or close to the termination; All load suspension chains, terminations and c) the localized deterioration including grouping attachments should be thoroughly examined by a of wire breaks; competent person at least once in every period of six d) the rate of increase of wire breaks; e) the complete breakage of a strand; months or in accordance with relevant legislation The purpose of this examination is to determine the physical condition of the chain and to assess the f) reduction of rope diameter resulting from condition in relation to future use The competent deterioration of the core; person may require the chain to be renewed if it is g) significant lengthening of the rope lay; h) external and internal wear; j ) external and internal corrosion; thought to be unsafe for further use Before carrying out examination of the load- carrying chains, they should be thoroughly cleaned If it is not possible to examine the whole of k) deformation; the chains while in situ, then it will be necessary for l) damage due to heat or electric arcing them to be removed Table — Wire rope discard criteria Examination should take account of these individual factors However, deterioration will C onstruction frequently result from a combination of factors giving a cumulative effect which should be recognized by the competent person, and which will reflect on the decision to discard the rope or to allow it to remain in service In all cases, the competent person should investigate whether the deterioration has been caused by a defect in the appliance; if so, he should recommend action to overcome the defect before new ropes are fitted Wire ropes should be removed from service and discarded in accordance with Table which covers the constructions of wire rope currently used for vehicle lifts Where any wire rope is j udged to require renewal or has failed, all wire ropes serving a similar application on the lift should be replaced Where a wire rope has been damaged during the installation of the lift or rope, renewal of the single damaged rope is acceptable Wire ropes up to mm diameter should be renewed after a period of six years maximum visible broken wires in any length of rope diameters × (1 2/6 + 6F/1 ) Right- hand ordinary lay Independent wire rope core 10 × (9/9/1 ) Right- hand ordinary lay Wire strand core 6 × 36 (1 4/7 and 7/7/1 ) Right- hand ordinary lay Fibre core 14 × 36 (1 4/7 and 7/7/1 ) Right- hand ordinary lay Independent wire rope core 14 37 × (5/1 ) Right- hand ordinary lay Wire strand core 10 37 × (6/1 ) Right- hand ordinary lay Wire strand core or fibre core irrespective of their apparent condition This All other multi- strand ropes requirement for wire rope replacement does not (in any length of rope replace but complements the normal six- monthly diameters) inspection NOTE Each rope has to be issued with a test certificate Number of maximum 11 The suggested values given in the table remain constant for the different diameters and tensile grades of rope used Form 87 (see 3.1 ) All ropes should be marked with a date identification on installation of the lift and subsequent rope renewals The Factories Act 961 requires the user to keep a register for the recording of wire rope examinations It is recommended that the register also records wire rope installation and replacements 10 © BSI 02- 999 BS AU 61 -1 b:1 983 Figure — Link plate depth In deciding the condition of a chain, the following criteria should be used as a guide a) Check the chains for wear on the link plate edges, i.e the wear caused by running over sheaves The maximum reduction in plate depth should be not more than % of the total plate depth h3 as shown in Figure The correct h3 dimension may be ascertained from BS 5594 and by measuring a portion of the chain that does not run over the sheave, e.g a portion near the chain anchor point b) Examine the chains for cracked or missing link plates c) Examine the chains for elongated holes in the outer link plates (head of pin in danger of pulling through) d) Examine the chains for loose or worn pins with damaged heads e) Examine the chains for evidence of rust or corrosion, particularly on inner faces of link plates f) Check for extension of the chains The extension should be measured over portions of the chain at a minimum of three separate locations and particularly where the chain passes over a sheave The maximum extension of the chain should not exceed % Whilst carrying out this check the length of the chain being measured should be held taut It is permissible, in the case of a lift where the chains remain in situ, to apply a suitable load to the lifting members in accordance with checking procedures given by the manufacturer As an alternative, where specific instructions are not issued by the manufacturer, recommended checking loads as given in Table may be used Chains that fail any of the criteria a) to f) will require to be replaced © BSI 02-1999 Table — Chain extension criteria Nominal pitch in p Number of Recommended Maximum pitches checking load measurement lb kg in mm ½ 39 80 35 19.8 503 æ 31 130 60 19.7 500 ¾ 25 180 80 19.1 486 19 315 145 19.3 490 1¼ 15 460 210 19.1 486 1ẵ 13 740 335 19.8 503 1ắ 11 915 415 19.6 497 605 770 18.3 465 700 132 21.4 543 Examination should take account of the individual factors However, deterioration will frequently result from a combination of factors giving an additive effect which should be recognized by the competent person and which will reflect on the decision either to discard the chains or to allow them to remain in service In all cases the competent person should investigate whether the deterioration has been caused by a defect in the appliance If so, he should recommend action to overcome the defect before new chains are fitted Where any chain is judged to require replacement or to have failed, all chains serving a similar application on the item of equipment should be replaced Where a chain has been damaged during the installation of the lift or chain, renewal of the single damaged chain is acceptable Each chain has to be issued with a test certificate Form 97 (see 3.1 4) All chains should be marked with a date identification on installation of the vehicle lift and subsequent chain renewals 11 BS AU 61 -1 b:1 983 Where chains have been removed and cleaned for examination purposes, they should be lubricated in accordance with the manufacturer’s instructions before replacement B.4 Mechanical lifts Any mechanical lift employing a drive screw and equipped with a device to take the load off the carrying nut in the event of its failure, should have such a device inspected every six months to ensure the device is set and operates in accordance with the manufacturer’s instructions The carrying nut mechanism and screw should be thoroughly examined by a competent person at least once in every period of six months to determine the amount of wear that has taken place This should also include examination of the screw for distortion and wear All load-bearing mechanisms should be replaced when the factor of safety has reached 50 % of that laid down in 3.1 Each manufacturer should declare in his instructions the examination criteria to determine this condition Equipment should be arranged so that it can be examined to determine the amount of wear B.5 Safety devices Safety devices (such as specified in 3.5 , 4.2.2 and 4.3 ) should be checked at six monthly intervals by a competent person to ensure that they operate correctly and that they are intact and undamaged This check should be carried out in accordance with the manufacturer’s instructions Safety devices should be tested at least every five years by a competent person to ensure that they operate correctly This test should be carried out in accordance with the manufacturer’s instructions B.6 Withdrawal from service If a fault (or faults) which could lead to danger has developed in a lift or its foundation, the lift should be withdrawn from service and not used again until the fault (or faults) has been rectified B.7 Statutory requirements These recommendations are not in any way intended to take the place of requirements laid down in legislation Before a lift is lowered, the floor below should be clear of personnel, tools, parts, cables and air lines Any ancillary equipment fitted to the lift should be used in accordance with the manufacturer’s instructions C.2 Wheel-supporting lifts To minimize unequal loading on the lifting mechanisms of the lifts and to enable them to rise evenly, vehicle weights should be distributed as evenly as possible (see 4.6) To prevent vehicles running off or slipping off the sides of runways, wheels should be centred on the runways On some types of lift this may be achieved by first adjusting the runways to the correct track width All vehicles on lifts having a safe working load of over tonnes should be secured in position on the lift, with portable chocks placed in front of and behind at least one wheel The engine of a vehicle should not be started or be allowed to continue running once the lift has been raised from the ground unless it is essential for a vehicle testing operation This applies particularly to vehicles with automatic transmissions as these may have a fault that could cause the vehicles to move, and special precautions should be taken Care should be taken to ensure that vehicles not become unstable when one or more of their wheels are raised from the platform Some single-ram lifts are capable of being turned when partially or fully raised and therefore, before they are fully lowered, care should be taken to check that they are in their correct position relative to any floor recesses Floor-mounted axle stands should not be used in order to achieve a partial wheel-free state of a vehicle on a single-ram lift capable of being turned when raised C.3 Body-supporting lifts It is essential that vehicles or the lifting arms are precisely positioned so as to ensure even weight distribution and correct contact with load bearing points so that the vehicle is in a stable state If vehicles have to be driven over the supporting Appendix C Recommendations for the arms, these should be fully lowered Telescopic arms should be adjusted clear of wheel tracks Channels safe use of lifts in service in the floor that accommodate any part of the lifting C.1 All lifts All pawls or locking devices, if fitted, arms and platforms should be cleaned out at regular should be seen to be engaged at the operating height intervals before any work is carried out from or under a lift Where pawls or locking devices are provided at only Care should be taken that the removal of a major component from a vehicle (e.g the engine) does not one height, lifts should not be used or left give rise to an unstable condition unattended at intermediate heights Working from an elevated lift that is not fitted with proper working platforms complete with guard rails is not recommended 12 © BSI 02-1999 BS AU 61 -1 :1 983 Publications referred to BS 4800 , Sp ecification for p aint co lours for b uilding p urp oses BS 69 , Fusion- w elded steel air receivers BS 78, Safety signs and colo urs BS 78- , Sp ecificatio n fo r co lour and design BS 5 00 , Unfired fusio n w elded p ressure v essels BS 5 94, Sp ecification for leaf chains, clev ises and sheaves IE E Regulations for the E lectrical E quip ment of Buildings , Ins titution of E lectrical E ngineers , S avoy Place, London WC R BL © BS I - 99 | | | | | | | | | BSI Ð British Standards Institution | | | | | | | BSI is the independent national body responsible for preparing British Standards It | | | | | | | presents the UK view on standards in E urope and at the international level It is incorporated by Royal Charter Revisions | | | | British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions | | | It is the constant aim of BSI to improve the quality of our products and services We | | | | | | | | would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover Tel: 02 8996 9000 Fax: 02 8996 7400 | | BSI offers members an individual updating service called PLUS which ensures that | | | | | | | | 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