Umm Al Ashtan (IMO 9074652) — LNG carrier, 135k m³

Specification

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

Kvaerner MasaFinland · delivered 1997

Moss spherical (Type B)Moss spherical (Type B) · technology licensed from the system ownerAbout the firm that licenses this system

Identified from the containment system and engine recorded against the ship, and from firms named on it in our curated list.

Moss Maritimecargo containment

Owns the Moss spherical IMO Type B containment design, used on 145 LNG carriers built since 1973 in sizes from 19,000 to 182,000 cubic metres.

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
Al Hamra	9074640	Operating	135,000	Moss spherical (Type B)	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.
Containment II: Moss spheres and SPB tanks
A free-standing LNG tank is one that supports its own weight and cargo loads rather than transferring them to the ship's hull, the two commercial designs being the Moss spherical tank and IHI's prismatic SPB tank.
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.