Lifting massive vessels weighing hundreds of tons is no easy job.
Oil refineries and chemical plants use large, high pressure vessels in their refining process. To upright these vessels requires two lifting devices: a lead, hoist, or head crane and crane or tailing crane.
Both the lead and tailing cranes should have enough capacity to be able to lift the entire vessel on its own. To do the job, both cranes can be mobile cranes, or the lead crane can be a gantry while the tailing crane can be a mobile crane or hydraulic gantry. The process of lifting such a large, awkward load, requires both cranes to lift the horizontal vessel off the ground. The tailing crane moves the load so the lead crane can lift it vertical.
Also see Creative Solution to a Difficult Job