Transportation Vessels

Market Booms….

What it led to Increase in Size of VESSELS?

What can be other reason behind increase in size of vessels?

What forces countries to transport via carriers?

Offshore pipelines

medium distances

< Viable Onshore pipelines

Evolution of Variations(Size)…

SHIP DESIGN DEVELOPMENT

Vessel Type Typical Size(Cubic metre) Typical Length(Metre)

Small scale LNG 0-36000 137

Medium scale LNG 36000-90000 260

Lower Conventional LNG 90000-145000 277

Upper Conventional LNG 145000-209000 290

Q-flex LNG 209000-220000 315

Q-max LNG 220000+ 345

Types of Carriers

• Self-supporting LNG carrier - Moss tanks (Spherical IMO type B LNG tanks) - IHI (Prismatic IMO type B LNG tanks)• Membrane tank LNG carrier - TGZ Mark III - GTT 96

Moss Tanks(Moss Maritime)

Moss Tanks(Moss Maritime)

• Moss type vessels have 4 or 5 tanks.• Checked at 3 month intervals for any cold spots

that would indicate breakdown in the insulation.• Tanks normally have a working pressure of up to

22 kPa (3.2 psi)-(raised for an emergency discharge)

• If both main pump fails, then the tank's safety valves are adjusted to lift cargo at 1bar.

IHI (Prismatic IMO type B LNG tanks)• Designed by Ishikawajima-Harima Heavy

Industries.• limit sloshing problems, an improvement over

Membrane LNG carrier tanks which may break due to sloshing impact, therefore

destroying the ship's hull. This is also of prime relevance for FPSO LNG (or FLNG).

TGZ Mark III

GT96