Mammoet assists L&T with revamp of Oman’s refinery

Mammoet has been contracted by Larsen & Toubro (L&T) to support heavy lifting activities during the turnaround of Oman Oil Refineries and Petroleum Industries Company’s (Orpic) Sohar Refinery in Oman. The scope included removal of the existing RFCC Reactor in one piece and installation of a new reactor, external riser, and associated components during Turnaround 2019.

Mammoet was chosen because of its expertise in turnarounds and shutdowns, focus on safety, and ability to minimize downtime. Also, Mammoet’s knowledge of the site played an important role in the decision: in 2005 Mammoet assisted in the construction of the Sohar refinery and installed the original reactor using its ultraheavy lift ring crane – PTC 35.

The PTC crane is the ideal crane for construction and revamp projects in refineries with complex, congested spaces because of its vast lifting capacity, long reach, and relatively small footprint, hence Mammoet proposed to re-use this crane for the exchange of the reactors. Project-specific challenges were overcome in the positioning of the PTC crane at the site which included limited working space to assemble the crane and minimum clearance for lifting maneuvers. Mammoet, in close collaboration with L&T, developed detailed erection and lifting plans, and procedures, where in some cases clearances of only 500mm were possible, requiring close coordination and cooperation on site. As a result, the 1600-ton crane safely removed the old reactor and successfully positioned the new 37-meter-long reactor, weighing 740 tons onto its foundation. The lifts were carried out effectively within the lifting height of 99 m.