Should stainless steel nuts or copper nuts be used for the liquid-phase connection of LNG tank trucks?
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Should stainless steel nuts or copper nuts be used for connecting the liquid phase port of LNG tank trucks? Currently, most of the flange nuts included with these tank trucks appear to be made of copper. Can copper nuts meet the requirements for use in low-temperature conditions? Are there any specific documents or standards that specify the use of copper nuts? LNG Process Discussion Group
Stainless steel nuts are more commonly used than copper nuts for connecting the liquid phase port of LNG tankers. Stainless steel exhibits excellent corrosion resistance and strength in low-temperature environments, making it more suitable for the low-temperature conditions of LNG. Although copper can be used under certain conditions, it may lose some of its mechanical properties at extremely low temperatures. When selecting materials, it is best to refer to specific industry standards and specifications, such as those set by the American Petroleum Institute (API) or the International Organization for Standardization (ISO). Generally, standards specify the type of material to be used under specific conditions. .
Stainless steel nuts and copper fastening tools