FORD SL4-1988 SAFETY CHAINS《安全链》.pdf
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1、 Manufacturing StandardsFord Motor Company198807 SAFETY CHAINS SL4Engineering Standards & Printed copies are uncontrolled.Systems Engineering (ESSE) Page 1 of 31. SCOPE: This standard states the requirements for safety chain design,specifications, uses and inspection.2. APPLICATION: Safety chains as
2、 covered by this standard include alloccasions where secondary support is considered essential in case theprime means of attachment fail. Items such as trolley hung weldingtransformers are further attached by safety chains.3. TYPES OF SAFETY CHAINS: This standard in no way restricts design orapplica
3、tion of safety chains, provided material and attachments are inaccord with material specifications and are approved by the Safety Unitof using locations.4. SPECIFICATIONS: The standard material for safety chains shall be grade70 chain, that will develop a tensile strength of 101,500 lbs/in2(71,364,6
4、50 kgs/m2), with a minimum elongation during the break test of15%.This standard does not apply to the use of special purpose safety chainfrom stainless steel, monel metal, bronze or other material for specialapplication where low carbon steel would be adversely affected bycorrosive fumes or substanc
5、es. This would constitute a specialapplication and approval must be obtained from using plants Safety Unit.5. PRECAUTION: Safety chains, when in either safe or prime supportposition, shall be so placed that they will never be able to complete anelectric circuit.6. LENGTH: The length of safety chains
6、 should be kept to a minimum to suitcase of installation and to limit “fall distance“ of unit being supportedto minimize impact loads.7. FITTINGS AND FASTENERS: All members attached to safety chain ends, toserve as fittings or closure fasteners, must be capable of carrying theequivalent of the rated
7、 chain capacity. All fittings and fasteners mustbe purchased under the same material specifications so that they will beconsistent with the same tensile strength as the chain.8. CHAIN STRENGTH: The following tabulation shows the safe load limit to beapplied to a chain supporting a static weight and
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- FORDSL41988SAFETYCHAINS 安全 PDF
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