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PSVs dominate LNG-fuelled service and supply ships

Wed 26 Apr 2017 by Mike Corkhill

PSVs dominate LNG-fuelled service and supply ships
LNG-fuelled harbour vessel Econuri is deployed at Incheon in South Korea

In this second of our four sector-specific guides to the world's LNG-fuelled tonnage, Mike Corkhill reports on growth in bookings for PSVs

There has been little change in the number of service and supply vessels in the world LNG-fuelled fleet over the past year. According to LNG World Shipping’s new review of gas-powered ships that are not LNG carriers, both the operational and on-order fleets of service and supply vessels rose by three units.

Platform supply vessels (PSVs) figure prominently in the at-sea LNG-powered service and supply fleet, accounting for 20 of the 33-ship complement. The orderbook, in contrast, shows much more variety, with a portfolio encompassing dredgers, a jack-up rig, a semi-submersible crane vessel, a cable-layer and a wind farm installation ship.

DEME of Belgium has been a leading advocate of LNG-fuelled dredgers and has investigated the challenges of using gas to power them. Factors to be weighed up include bunker tank size and location, LNG bunker availability, shipboard bunkering connections, crew training and the step load capability of the various gas-burning engine options.

Combined with its cold box encasement a cylindrical Type C LNG bunker tank occupies about three times as much space as a prism-shaped tank of marine gas oil (MGO) containing the same energy.

While Type C pressure vessel tanks offer many advantages, accommodating them has a significant impact on vessel layout. Also, the tank location restrictions imposed by the new International Code of Safety for Ships using Gases or other Low-Flashpoint Fuels (IGF Code) add another level of complexity to the design challenge.

Naval architects working on the DEME dredgers found that dual-fuel diesel engines worked best for the vessels as they have a better step load capability than gas engines. The mix of LNG and MGO bunker tank capacities associated with such propulsion units also offers a measure of redundancy.

The aim is to optimise the use of LNG, assuming that the cost of this fuel is lower than MGO, but to provide sufficient MGO as a backup. The crew can switch to MGO if the dredger has to operate longer than planned before the next LNG bunkering stop.

Harbour tugs are the second most popular type of LNG-fuelled service and supply vessel, after PSVs. There are now six gas-powered tugs in service and eight on order. Wärtsilä, with its medium-speed dual-fuel engines, and Rolls-Royce, with its gas-only units, have both enjoyed success in providing tug propulsion systems.

LNG-fuelled tugs are in operation in Norway, China and Japan, while Dubai and Singapore are poised to join the club as a result of vessels on order. The next new member could well be the US where a number of designs for gas-fuelled tugs and towboats have been tabled.

Three of the tugs on order are under construction at the Gondan yard in Spain for Østensjø Rederi AS. The owner has opted for Wärtsilä engines and the series is slated to provide ship assist and escort services for the LNG carriers loading cargoes at the Statoil export terminal near Hammerfest in northern Norway.

 

LNG-fuelled service and supply ships, March 2017

 

  STATUS SHIP NAME SHIP TYPE DELIVERY DATE OWNER SHIPBUILDER ENGINE PROPULSION  CLASS SOCIETY
1 In service Stil Pioneer PSV 2003 Møkster Kleven Ulsteinvik Wärtsilä DF DNV GL
2   Viking Energy PSV 2003 Eidesvik Kleven Ulsteinvik Wärtsilä DF DNV GL
3   Viking Queen PSV 2008 Eidesvik West Contractors Wärtsilä DF DNV GL
4   Viking Lady PSV 2009 Eidesvik West Contractors Wärtsilä DF DNV GL
5   Barentshav Patrol vessel 2009 Remøy Myklebust Mitsubishi Gas + oil DNV GL
6   Bergen Patrol vessel 2010 Remøy Myklebust Mitsubishi Gas + oil DNV GL
7   Sortland Patrol vessel 2010 Remøy Myklebust Mitsubishi Gas + oil DNV GL
8   Skandi Gamma PSV 2011 DOF STX OSV Soviknes Wärtsilä DF DNV GL
9   Normand Arctic PSV 2011 Solstad STX OSV Langen Wärtsilä DF DNV GL
10   Viking Prince PSV 2012 Eidesvik Kleven Ulsteinvik Wärtsilä DF DNV GL
11   Viking Princess PSV 2012 Eidesvik Kleven Ulsteinvik Wärtsilä DF DNV GL
12   Island Crusader PSV 2012 Solstad STX OSV Brevik Rolls-Royce Gas DNV GL
13   Island Contender PSV 2012 Solstad STX OSV Brevik Rolls-Royce Gas DNV GL
14   Olympic Energy PSV 2012 Solstad STX OSV Aukra Wärtsilä DF DNV GL
15   Rem Leader PSV 2013 Remøy Shipping Kleven Verft Wärtsilä DF DNV GL
16   Econuri Harbour vessel 2013 Incheon Port Authority Samsung Wärtsilä DF KR
17   Hai Yang Shi You 521 Tug 2013 CNOOC Guangzhou Huangpu Wärtsilä DF CCS
18   Hai Yang Shi You 522 Tug 2013 CNOOC Guangzhou Huangpu Wärtsilä DF CCS
19   Børgoy Tug 2014 Buksér og Berging Sanmar Rolls-Royce Gas DNV GL
20   Bokn Tug 2014 Buksér og Berging Sanmar Rolls-Royce Gas DNV GL
21   Turva Patrol vessel 2014 Finnish Border Guard STX Turku Wärtsilä DF DNV GL
22   Stril Barents PSV 2015 Møkster Hellesøy Wärtsilä DF DNV GL
23   Harvey Energy PSV 2015 Harvey Gulf Trinity Offshore Wärtsilä DF ABS
24   Harvey Power PSV 2015 Harvey Gulf Trinity Offshore Wärtsilä DF ABS
25   Harvey Liberty PSV 2016 Harvey Gulf Trinity Offshore Wärtsilä DF ABS
26   Harvey Freedom PSV 2017 Harvey Gulf Trinity Offshore Wärtsilä DF ABS
27   Rem Eir PSV 2015 Remøy Shipping Kleven Verft Wärtsilä DF DNV GL
28   Hai Yang Shi You 525 Tug 2015 CNOOC Zhenjiang Rolls-Royce Gas CCS
29   Siem Symphony PSV 2015 Siem Offshore Hellesøy Wärtsilä DF DNV GL
30   Siem Pride PSV 2015 Siem Offshore Remontowa Wärtsilä DF DNV GL
31   Sakigaki Tug 2015 NYK Line Keihin Dock Niigata DF ClassNK
32   Polaris Icebreaker 2016 Arctia Arctech Helsinki Wärtsilä DF LR
33   Siem Thiima PSV 2017 Siem Offshore Remontowa Wärtsilä DF DNV GL
                   
1 On order Elemarateyah Tug 2017 Dubai Maritime City DDW Dubai Wärtsilä DF Tasneef
2   unnamed Tug 2017 CNOOC Zhenjiang Rolls-Royce Gas CCS
3   Siem Melody PSV 2017 Siem Offshore Remontowa Wärtsilä DF DNV GL
4   Siem Rhapsody PSV 2017 Siem Offshore Remontowa Wärtsilä DF DNV GL
5   Harvey America PSV 2017 Harvey Gulf Trinity Offshore Wärtsilä DF ABS
6   Harvey Patriot PSV 2017 Harvey Gulf Trinity Offshore Wärtsilä DF ABS
7   Hammerfest Tug 2017 Østensjø Rederi Astilleros Gondan Wärtsilä DF BV
8   unnamed Tug 2017 Østensjø Rederi Astilleros Gondan Wärtsilä DF BV
9   unnamed Tug 2017 Østensjø Rederi Astilleros Gondan Wärtsilä DF BV
10   Scheldt River Dredger 2017 DEME Royal IHC Wärtsilä DF BV
11   Minerva Dredger 2017 DEME Royal IHC Anglo Belgian DF BV
12   Bonny River Dredger 2017 DEME Cosco Guangdong Wärtsilä DF unnamed
13   Apollo Jack-up rig 2017 DEME LaNaval unnamed DF unnamed
14   Living Stone Cable-layer 2017 DEME Uljanik Wärtsilä DF unnamed
15   Spartacus Dredger 2019 DEME Royal OHC Wärtsilä DF unnamed
16   Sleipnir Semisub crane vessel 2018 Heerema Sembawang unnamed DF unnamed
17   Werkendam Dredger 2018 Van Oord Neptune Shipyards unnamed DF unnamed
18   Ecodelta Dredger 2018 Van der Kamp Barkmeijer Anglo Belgian DF unnamed
19   Atair Survey ship 2018 German Maritime Authority Fassmer unnamed unnamed unnamed
20   unnamed Tug 2018 Ningbo Port Co unnamed Niigata DF CCS
21   unnamed Tug 2018 Keppel Smit Towage Keppel unnamed unnamed unnamed
22   unnamed Tug 2018 Maju Maritime Keppel unnamed unnamed unnamed
23   Orion Wind farm installation vessel 2019 GeoSea Cosco unnamed unnamed unnamed

Source: LNG World Shipping, March 2017

Notes:

* conversion project

DF: medium-speed dual-fuel

HPLSDF: high-pressure, low-speed dua-fuel

LPLSDF: low-pressure, low-speed dual fuel

 

 

 

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