Wavepiercer adopts offshore support role

Following the evaluation of a series of criteria, an unusual platform for the application , i.e. a wave piercing catamaran hull form, was chosen. The bow is configured to interface cleanly with the rig structure, while being well clear in all other areas to avoid risk of collisions and injuries. To eliminate the risk of damage to the forepeaks or having the hull hang up on the rig structure, the bows have been configured so that they do not extend beyond the outline of the foredeck.

The vessel is designed for functionality and enhanced safety, while retaining the wave piercer’s offshore capabilities. It features a large aft-deck with container mounts and a Sormec M18FB/4S 23.5t/m deck crane. With a load capacity of 3t/m², the vessel has over 50m² of usable deck space, giving the capacity to carry a 20ft oil spill recovery container transversely on the aft deck. In addition to the bow transfer system, passenger access is provided via side gates at the forward end of the cargo deck. This transverse passenger thoroughfare is protected from the cargo space by large cargo barriers, allowing passengers and cargo to be loaded concurrently in a safe and efficient manner.

Topaz Zenith is powered by a pair of 1,193kW Caterpillar C32 Acert engines, driving Hamilton HM651 waterjets. Speed on sea trials confirmed the design predictions with the vessel achieving 32 knots sprint speed, and 28 knots service speed at 85% MCR. The propulsion system exploits the operating speed range of the engines, allowing full power from 2,000rpm. This allowed a cost and weight saving by minimising the rotation speed of the FiFi clutch equipment. The port main engine is mated to a hydraulic clutch turning an FFS 250x350HD FiFi pump that feeds a foredeck mounted fire monitor, with a rating of 600m³/hr.

A similar vessel is nearing completion at Topaz Shipbuilding that will incorporate a slightly larger cabin and additional fluid capacities, and will provide 24 hour support in the wind farm sector.