Installation of flange connection structure in flare stack commonly adopt parts assembly or segmental hoisting. In this paper,due to the harsh conditions of construction,an innovation of flange connection type flare stack's one-time integral hoisting technology and method is proposed.This paper use CATIA finite element analysis simulate force of flare stack under two extreme conditions during the integral hoisting: horizontal and vertical conditions. The strength and stability of the hoisting stack are checked and calculated.Then we find out the dangerous point and propose the reinforcement solutions for weak structure,providing the basis for hoisting process design.
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