Storage facilities for liquefied natural gas (LNG) are being built with 9% nickel steel in order to obtain sufficient ductility and structural integrity at -163 deg C and below. Although research has been carried out with matching welding consumables for the welding of these applications, at present still only nickel base consumables have proved to meet the requirements such as mechanical properties. This paper describes in detail the metallurgy of 9% nickel steel, the nickel base welding consumables and the welded joints in relation to the chemical composition, heat treatments, mechanical properties, physical properties, international specifications and project requirements for LNG tanks. For the welding of 9% nickel steel with SMAW and SAW, some practical guidelines are presented with view on appropriate joint preparation, welding parameters and consumable developments (Nyloid 2 electrodes). These recommendations are exemplified with recent reference projects, like the Dabhol LNG Terminal Project-Phase II which includes an LNG storage and re-gasification facility for the new power station at Dabhol on the west coast of India
Welding 9% nickel steel for liquefied natural gas (LNG) applications
Welding and Cutting ; 6 , 2 ; 103-112
2007
10 Seiten, 8 Bilder, 4 Tabellen, 18 Quellen
Article (Journal)
English
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