How to choose lifting rings for skid-mounted equipment?
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For a 10t equipment unit, four GB/T825 suspension ring screws should be placed at the rectangular corner points of the bottom skid, which are 4000x2000 in size. How large should it be chosen? Why? If you want to choose an universal sling, no calculation is needed. But it’s too expensive; it’s usually imported.
Actually, you’ve already mentioned the standard; it can be found in GB/T825. A M30 bolt is just right, and if you want to be extra cautious, use a M36 bolt
Reply to 2# lionking: I have a different opinion. The rated load of the eyebolt for the M30 is 2.5 tons, but you haven’t taken into account the angle between the two steel cables during lifting. The larger the angle between these cables during lifting (although it generally should not exceed 60°), the less weight can be lifted. At least an M36 should be used.
Reply to 1# nbazxb: For the 10t equipment, four lifting lugs are installed at the rectangular corners of the bottom skid, which measures 4000x2000. When lifting, the truck crane is equipped with shackles, making the process simple and convenient
Reply to 3# hcwang12345: I checked the manual. When lifting with a single screw, the maximum lifting weight for M36 is 4 tons; when lifting with two screws (with the lifting rope at a 45° angle in the vertical direction), the maximum lifting weight for M36 is 2 tons. Can 10t be achieved if 4 are used? Is it choosing a larger one? How about the M48?
Hehe, the more you talk about it, the bigger it seems. But I agree with what those guys say – it’s better to have extra safety measures. To be honest, ten tons is no small amount; something like that falling down could cause serious problems
Safety first; if there is enough space, the larger, the better.