text
cryogenic engineering
dwt offshore support vessel (OSV) newbuildings under construction at the TY Offshore yard in Gulfport, Mississippi, for Harvey Gulf International Marine and operation in the Gulf of Mexico. The first three will go on charter to Shell and the entry into service of the lead ship, Harvey Energy, was imminent as this issue went to press. The vessel will be the first LNG-fuelled vessel that is not an LNG carrier to be delivered by a US shipbuilder and the first such vessel to go into operation in the USA.
Harvey Gulf states that the US$55 million newbuild cost for each of the STX Marine-designed LNG-powered OSVs is about US$10 million more than that of a similar-sized OSV running on diesel fuel. However, the shipowner expects to recoup the additional capital expenditure within a relatively short period due to the savings in fuel costs it will be able to achieve.
Each OSV is powered by a three 34DF Wärtsilä engines and provided with a Wärtsilä LNGPac fuelling system, the centrepiece of which is a 290m3 LNG bunker tank. While Chart supplied the tanks for the first three ships in the Harvey Gulf series from its Minnesota factory, Lockheed Martin – the manufacturer of the external liquid hydrogen and oxygen fuel tanks for the Space Shuttle – has built the LNG fuel tanks for the final three OSVs at its Michoud assembly plant
in Louisiana. The logistics involved in delivering tanks from this facility to TY Offshore are much less challenging than floating the units down the length of the Mississippi River. Lockheed Martin is also building the six
350m3 pressure vessel LNG storage tanks for the bunkering facility that Harvey Gulf is building at its Port Fourchon OSV vessel base in Louisiana. This facility, which is due for completion later this year, will be the first LNG bunkering station in the USA. LNG-powered container ships are also set to become part of the US shipping scene, thanks to initiatives by Totem Ocean Trailer Express (TOTE), Crowley Maritime, Matson Navigation and Horizon Lines. In addition to a pair of LNG-powered, 3,100 teu container ships ordered at the National Steel and Shipbuilding Co (NASSCO) yard in California, TOTE has also decided to convert two of its existing ships, the Orca class roro cargo ships Midnight Sun and North Star, to run on gas.
Due for delivery in 2015 and 2016, the TOTE newbuildings will be world’s first purpose-built, LNG-propelled container ships. The vessels will be provided with MAN Diesel & Turbo’s new low-speed, electronically controlled, gas-injection (ME-GI) dual-fuel engines, another box ship first. The engines will be fed by means of a fuel gas supply system (FGSS) developed by Daewoo Shipbuilding & Marine Engineering (DSME)
and its Shinhan Machinery affiliate. The Daewoo FGSSs will feature ACD’s model MSP-SL high- pressure pumps with gearbox assemblies and electric 150kW inverter duty motors. The ABS-classed container ships will run
between Jacksonville, Florida and San Juan, Puerto Rico. TOTE has chosen Pivotal LNG, a joint venture company launched by AGL Resources and WesPac Midstream, to provide the LNG bunker fuel that will be used to power the vessels. The container ships will bunker at their home port of Jacksonville, Florida and Pivotal LNG will provide the LNG from a new, small-scale liquefaction plant it plans to build in the port. TOTE has contracted Wärtsilä to supply main engines, generators and its LNGPac integrated LNG storage and fuel gas handling systems for Midnight Sun and North Star in what will be the largest project yet mounted involving the conversion of existing ships to run on LNG. The two 255m-long vessels run between Tacoma in Washington and Anchorage, Alaska. TOTE plans to have the converted ships in service by 2015, although the yard that will carry out the retrofit work had yet to be chosen at the time of writing in early April. Each of the vessels will be equipped with four 12-cylinder Wärtsilä 50DF dual-fuel engines and generator sets. These engines are able to run on either natural gas, low-sulphur diesel oil or
25,000 valves installed on vessels 50 years in Cryogenics Low cost of ownership Outstanding Quality and Safety record Approved by all major class societies
WORLD-CLASS VALVES FOR LNG Marine +44 (0)114 224 0000 54 I Marine Propulsion I April/May 2014 Globe and check valves for LNG fuel systems
sales@bestobellvalves.com www.bestobellvalves.com www.mpropulsion.com
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108