A Comparison of the Collision Resistance of Membrane Tank-Type and Spherical Tank-Type LNG Tankers (eBook)

Published Date

January 1981

A Comparison of the Collision Resistance of Membrane Tank-Type and Spherical Tank-Type LNG Tankers (eBook)

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This paper describes a study to compare the collision resistance of two types of LNG carrier(19pp)

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This report describes the results of a study to compare the collision resistance of two different types of LNG carriers—a membrane type tanker with essentially rectangular shaped tanks and a Moss-type tanker with spherical cargo tanks. Both ships are of approximately the same size, 125,000 cubic meter capacity, and are subjected to the same collision scenario. The striking vessel is taken to be a 250,000 long ton (LT) tanker with a plumb cylindrical bow of 10 meter radius. The specifics of the scenario have been assumed to maintain the comparison on the same basis and are:
a) that the bow of the striking ship is rigid and does not absorb any of the kinetic energy of the collision. The effect of this assumption will be discussed in the body of the report.
b) that the depth of the striking ship is great enough so that both the deck and bottom of the struck ship are engaged. Other than bow geometry and displacement, no other configuration assumptions are involved, with regard to the striking ship.
c) that the strike occurs at right angles midway between bulkheads near the longitudinal center of gravity of the ship. It is assumed that there will be no energy dissipation due to rigid body motion. Structural information on the membrane-type ship has been furnished by the sponsors of the study, the Institut de Recherches de la Construction Navale. Structural information on the Moss-type ship has been taken from published reports.

The method of analysis used in the study is the Rosenblatt method originally developed by McDermott and others in a study conducted by M. Rosenblatt and Son, Inc., for the U.S. Coast Guard.

Paper delivered by:
PR van Mater Jr (Band, Lavis & Associates)
DL Edinberg (Giannotti & Associates)
P Orsero (Institut de Recherches de la Construction Navale)
D Finifter (Institut de Recherches de la Construction Navale)

Prepared for:
Gastech Hamburg 1981

For over 45 years, the Gastech Exhibition & Conference has been at the forefront of the international gas and LNG market. This world-renowned event is regarded as the most significant meeting place for gas and LNG professionals, where the global industry gathers to do business.

Gastech hosts major IOCs, NOC’s, global utility companies, EPC contractors, shipbuilders, pipeline companies, manufacturers, distributors, technology and service providers, all who play an active role in the global energy value chain.

Title: A Comparison of the Collision Resistance of Membrane Tank-Type and Spherical Tank-Type LNG Tankers (eBook)
Product Code: 4433g169
Published Date: January 1981

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