Lift and installation of two LPG tank platforms, Australia
ALE has lifted and installed two LPG tank platforms on top of the LPG tanks. This was part of the Ichthys Project Onshore LNG Facilities in Darwin, Australia.
The tank platforms comprised of an LPG propane tank main platform, weighing 390t, and an LPG butane tank main platform, weighing 351t.
The total lifting load, including the rigging arrangement and hook, was approximately 456t for the butane tank and 516t for the propane tank.
The platforms were assembled overseas on top of transport frames and shipped to Australia on a barge. ALE offloaded and moved the modules to the lift area using 58 axle lines of SPMTs.
The platforms were weighted by ALE before the lift.
The lift operation was particularly complex and presented challenges, because of the rigging arrangement and the irregular and asymmetric dimensions. In order to overcome these challenges, ALE engineered preformed tri-dimensional simulations and prepared a detailed lift plan with indication of the required ground pressures, lifting parameters and step-by-step methodology, methodology for the erection and connection of the rigging arrangement.
Due to limited strength of the platforms against lifting loads, each lifting point was connected with a heavy duty turnbuckle and load cells were integrated in the rigging arrangement. ALE engineers defined a step-by-step procedure for the load transfer to the crane, reading the load cells and adjusting the turnbuckles when necessary. The procedure involved the client, the platform designer and the third party engineering consultants.
The lifting operation was designed with safety in mind and, as such, a tridimensional clash detection analysis was performed due to the restricted clearances between the module and existing structure, the module and the crane boom and the crane super-lift and other items.
An LR11350 crawler crane was used to perform the lifts.