OPTIMUM METHODS OF OPERATION FOR LNG CARRIERS EXAMINING THE MAJOR CONTAINMENT SYSTEMS DESIGNS

A unique feature of ocean transportation of liquified natural gas is the ability of the LNG tanker to utilise its cargo as fuel. Almost all the present LNG containment systems are designed to carry the cargo at near atmospheric pressure and low temperature. The low temperature necessitates the provision of adequate insulation to protect the ship and to control cargo evaporation. The chosen relative efficiency of the insulation defines the rate of continuous evaporation (boil-off) of the cargo. This boil-off may be burned in the ship's boilers or reliquefied and returned to the cargo tanks. One of the problems facing operators of LNG carriers is to determine which of these alternatives is preferable from an economic point of view. The use of evaporated cargo as fuel for the ship in both the loaded and ballast conditions is considered with the object of indicating the most advantageous use of boil-off in the operation of similar size ships fitted with cargo tanks of the self-supporting, prismatic, spherical, and membrane designs and of assessing their relative merits over four representative trade routes.

• Supplemental Notes:
  • Proceedings held in Paris September 30-October 3, 1975.
• Corporate Authors:

  GASTECH 75 LNG & LPG Technology Congress

  Paris,   France 
• Authors:
  • Vrancken, P L
  • Gordon, D
• Publication Date: 1975

Media Info

• Pagination: 11 p.

Subject/Index Terms

• TRT Terms: Boil off; Containing equipment; Fuel systems; Liquefied gases; Liquefied natural gas; Ship operations; Tankers
• Old TRIS Terms: Boiloff utilization; Containment vessels; Lng containment systems; Tanker operations
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00157850
• Record Type: Publication
• Source Agency: British Ship Research Association
• Files: TRIS
• Created Date: Aug 15 1977 12:00AM