Case Study

Rigging and Assembly of 15 Air Handling Units

Rigging and Assembly of 15 Air Handling Units

Client: Kirby Group Engineering on behalf of Janssen Sciences Ireland


Location: Cork


During a €300m expansion project for Janssen Sciences, Wm. O’Brien was responsible for the rigging and assembly of 15 air handling units (AHUs). Involving a complex lift and shift operation, the AHUs needed to be manoeuvred and assembled in a tight environment, whilst also working around other teams in the facility.


The AHUs came in a number of sections, each weighing up to 2 ton. The AHU sections were brought to the entrance and skated into the building. Where possible, we used an electric forklift to safely raise them on to a temporary second floor steel platform.  When it was too tight to work with the electric forklift chain blocks were utilised instead. The AHUs were then positioned, assembled, and bolted together.


Equipment included:

– 60 ton crane

– Electric forklift (with white wheels to protect the floor area)

– Skates

– Toe jacks

– Rigging gear


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