Larsen and Toubro Ltd was engaged in installing two new platforms in the Bombay High field, but due to issues with the specified pressure grouting technique, the jacket pile connection could not be completed on the last remaining leg on the RS 16 platform.A Danish company was contacted in April 2009 and immediately mobilised all their grouting equipment and personnel together with around 80 tons of special UHPC grouting materials to Mumbai.
UHPC grouting material was specified due to its high compressive strength and modulus of elasticity in the region of four times higher than conventional grouts. In addition, the highly viscous and cohesive nature of UHPC prevents the risk of cement particles washout or being mixed withwater, making UHPC grouting material ideal for use in underwater conditions.
Working from Sapura 3000, a DP Heavy Lift and Pipe laying Vessel, grout hoses were connectedby divers to the pile grout inlet underwater at a depth of 46 meters. Grouting works were carried out 24 hours to expedite completion and all grouting works were
completed within 16 hours. The topside was installed 36 hours after completion of the grouting.
The use of UHPC materials have been proven to provide fast and efficient solutions to structural installations and repairs in the offshore environment.
