Page 46: of Marine News Magazine (February 2014)

TECH FILEWaterjet manufacturer HamiltonJet recently got great news when four HT900 waterjets were selected for Incat Crowther?s latest project ? a  rst-of-type 70 meter Cata- maran Fast Crew Boat for operations in the Caspian Sea oil industry in Azerbaijan. When completed, this vessel will be the world?s largest high speed crew boat operating in the global oil industry. It will also be the largest vessel HamiltonJet has been involved in to date, and will further showcase waterjet?s performance and maneuvering bene ts over other forms of propulsion in this demanding marine sector. HT Series waterjets feature a mixed  ow pump with a greater nozzle to inlet ratio than comparable size axial  ow waterjets. This provides high ef ciency over the entire vessel speed range. DP & W ATERJETS ? A NATURAL CONNECTIONThe DP2 class vessel will have four control stations, each utilizing HamiltonJet?s MECS control system integrating with a DNV DYNPOS-AUTR dynamic positioning sys- tem. This system provides improved safety during crew transfers in conditions up to sea state 4. In designing this new 70m vessel class, Incat Crowther drew on its previ- ous experience with the SEACOR CrewZer class of fast catamaran crewboats, with the fourth of these recently launched in the US. These vessels also utilize Hamilton- Jet waterjet propulsion (quad HM811s) and the combi- nation of catamaran hull form and waterjets has proven very successful. HamiltonJet waterjets work particularly well in DP capable vessels, where the powerful 360 degree thrust forces generated by the jet?s split duct reverse de ec-tor at any boat speed effectively act as an azimuth thruster. The effect of the waterjet maneuvering thrust is further enhanced with the wide spacing of the jet units in a cata-maran con guration ? two jets per hull ? which provides even better control of the vessel?s stern and can even assist with sideways movement of the bow. HamiltonJet HT900s for World?s Biggest High Speed Crew Boat 46 MNFebruary 2014 MN FEB14 Layout 32-49.indd 46MN FEB14 Layout 32-49.indd 461/20/2014 10:21:16 AM1/20/2014 10:21:16 AM