Container lifting lugs are the principal means used to handle freight transport units by coupling them with their corner fitting apertures hence their integrity is of prime concern. Not only are they used for lifting but also for draging and upending containers to discharge them, therefore an appreciation as to their ability to withstand forces other than those induced by lifting needs a mention.There are two mandatory strength tests in ISO 1496 Part 4 that apply specifically to bottom corner fittings that must be satisfactorily complied with for them to be issued with a CSC Plate. Together they guarantee integrity of containment of corner fittings, principally by welding, to secure them to the load bearing frames of containers.
The test are: lifting container from bottom 4 corner fittings, Test No 3
and an external constraint test Test No 4
where the unit is constrained by twislocks in the bottom horizontal apertures at one end whilst corner fittings at the opposite end are loaded by horizontal forces.
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