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2 - Structural Steel Selection and Construction

Published online by Cambridge University Press:  27 January 2022

Jeom Kee Paik
Jeom Kee Paik
Affiliation:
University College London
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Summary

Classification society rules or recommended practices dictate the types of steel to be used in the assembly of the hull structures of ship-shaped offshore installations. The steel must exhibit high levels of buckling and fatigue performance and be amenable to corrosion management. It is recommended that the proportion of reduced thickness, high strength steel be minimised and the proportion of ordinary steel (e.g., grade A) be maximised in a hull structure. However, structural members that require an ordinary steel plate with a thickness greater than 30 mm may instead be made from high strength steel to avoid the need for heavy welding and to simplify the construction. The greater resistance of high strength steel to corrosion reduces the need for repairs in dry dock, which is critical for the long on site life required in a ship-shaped offshore installation. Three grades of steel are used in the assembly of hulls for installations that will be in service at sub-zero temperatures: grade D steel for use at −20°C, grade E steel for use at −40°C and grade F steel for use at −60°C. Steel may be exposed to colder temperatures than it has been designed to withstand or even to cryogenic conditions as a result of the accidental release of liquefied gas (e.g., liquefied natural gas or hydrogen). This can cause a brittle fracture in structural steel and a subsequent catastrophic failure.

Type
Chapter
Information
Ship-Shaped Offshore Installations
Design, Construction, Operation, Healthcare and Decommissioning
 , pp. 49 - 80
Publisher: Cambridge University Press
Print publication year: 2022

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