BW Boston (IMO 9230062) — LNG carrier, 138k m³

Specification

As GEM reports it: containment “membrane”, propulsion “steam”.

Hanwha OceanSouth Korea · delivered 2003

Membrane (system not specified)Membrane

Stakes exactly as GEM reports them for this vessel.

Vessels from the same yard, delivered the same year, with the same cargo capacity to the nearest 1,000 m³. A shared design is likely but not certain.

Vessel	IMO	Status	Capacity	Containment	Propulsion
Energos Princess	9253715	Operating	138,000	Membrane (system not specified)	Steam turbine
Metagas Everest	9243148	Operating	138,000	Membrane (system not specified)	Steam turbine
Portovyy	9246621	Operating	138,100	Membrane (system not specified)	Steam turbine

Background on the technology and the terms used on this page.

LNG carrier anatomy
An LNG carrier is a ship built around insulated cargo tanks that hold liquefied gas at minus 162 degrees, with an engine able to burn the cargo vapour that inevitably boils off during the voyage.
Membrane versus Moss tanks
Cargo containment is the system that holds LNG at minus 162 degrees inside a ship, and it comes in two families: membranes, which are thin barriers supported by the hull, and free-standing tanks, which carry their own load.
Propulsion I: steam turbines and why they endured
Steam turbine propulsion drives an LNG carrier by raising steam in boilers that can burn cargo boil-off gas, fuel oil, or any mixture of the two, and turning a turbine geared to a single propeller shaft.
Ship classes: conventional, Q-Flex, Q-Max and small-scale
LNG carriers fall into recognised size classes running from small-scale vessels under 30,000 cubic metres, through the 174,000 cubic metre conventional standard, to the 266,000 cubic metre Q-Max ships built for Qatar.