L&T Hydrocarbon Engineering (LTHE) developed the in-house capability for roof-raising in Cryogenic Tank Projects. At the Reliance Dahej site,
the Company is executing a project involving cryogenic ethane/LNG tank construction. A steel roof along
with other structural attachments (total 850 MT)
has to be lifted to an elevation of 37 m for the
construction of the tank. This is done by using four air blowers, located at a temporary opening in the outer
tank wall, at the ground level. Cryogenic tank roof-raising forms a critical part of the Cryogenic Tank construction process and requires meticulous planning and strict quality checks to ensure that the roof is lifted in a well-balanced manner, flawlessly. It took a dedicated engineering team, months of planning and utilisation of their combined expertise to execute this task successfully. The roof-raising operation was completed in seven hours. It took another 5 hours to weld it in place along with a compression ring at the top. The businesses’ in-house capabilities resulted in savings of
11 million, along with enhanced control of the process, and improvements in quality, safety and execution speed. The learnings and expertise gained will hold LTHE in good stead for executing similar projects in future.