- Inspection of crane
- NDT of critical welds
- Ultrasonic measurement of wall thickness reduction
- Generation of boom CAD model with effective corroded wall thicknesses
- Finite Element Analysis of corroded boom according to Lloyd’s Register “Code for Lifting Appliances in a Marine Environment 2016.”
- Revised load chart approved by Lloyd’s Register
Steel repairs of the entire crane and crane boom were entrusted to Alatas and preparations were made to offload the jib at Singapore Anchorage and have it transported to our Specialised Accident Repair Workshop there.
Alatas Crane Design drafted the boom welding repair procedure, for which class approval was obtained ahead of commencing the structural steel repairs.
The repaired boom was sand-blasted, painted and outfitted with overhauled rope sheaves and grab accessories, such as grab cable, grab tugger winch and deflection pulleys and sent back on board.
The boom was then installed back to the crane column at anchorage. In addition to the boom installation, Alatas also carried out other accident repairs to crane column sheave assembly, hook block and boom rest structure.
Upon completion of the repairs, the crane then was function tested and successfully overload tested, with class certificates issued.