what’re the problems of gantry crane lifts large scale parts ?
In order to finish the erection smoothly, so when the gantry crane lifts the large scale parts, the steps are following: 
1、Making sure the center of gravity and conforming the weight of parts according to the drawings before work.
2、Choosing the slings such as the rope, shackle and hook.
3、There are lifting loops and ears for erection, there should add rigging on the lifting loops before work.
4、The parts doesn’t have loop, and we should look correct rigging’s position. And the head of hook should align the center of gravity.
5、The angle between the ropes should less than 90°.
