On-site in-place method for ultra-large pressure vessel

The invention belongs to the technical field of ultra-large pressure vessel equipment transportation, and particularly relates to an on-site in-place method for an ultra-large pressure vessel. According to the method, on-site in-place of the ultra-large pressure vessel is completed through eight steps of collecting in-place current situation information of the ultra-large pressure vessel, drawing up a saddle distribution scheme, drawing up an SPMT vehicle group distribution scheme, checking stability, selecting a crawler crane, assembling and hoisting preparation of an SPMT vehicle group, adjusting a saddle, adjusting the saddle and conveying the ultra-large pressure vessel in place. By the adoption of the technical scheme, the ultra-large pressure container can be safely and efficiently conveyed to the position over the container foundation, it can be guaranteed that the main lifting lug of the equipment container is located under the portal crane, so that equipment can be smoothly hoisted, and cost is saved