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Review of four international LNG standards (ISO 12991-2012, NFPA 52-2013, SAE J2343-2008 and AS 2739-2009) for requirements related to LNG tank shut-off devices. The report discusses specific aspects and challenges of mounting two valves in series on same LNG line. The emphasis is on using two components, a manual valve and an automatic valve mounted in series on
the LNG supply line to shutoff the flow.
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