According to the derrick lifting design and schedule requirements, the derrick had to be lifted and completed in a single day. However, the mountainous area is highly humid, with thick fog in the morning and evening and visibility of less than 30 meters, so the entire construction could only be completed within a short two-hour window at noon. XCMG cranes fully withstood the test; their ease of assembly, lifting efficiency, lifting performance, stability and safety were all unanimously recognized by the customer and the construction contractor.