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Shell named NanoVapor as best technology to make a tank safe 

Shell Retail Engineering Network , Standard 08.18, nominates NanoVapor suppression as best practice to gas-free Underground Storage Tanks.
Nanovapor replaces other more contaminant, expensive, unsafe and time consuming process (water filling, nitrogen purging, dry-ice)
This standard establishes specific requirements and preferred methods of making safe underground petroleum storage components by mainly making components inert or making Gas Free to remove the risk of explosion before any work is done.
250+ UST degassed with NanoVapor
Used in 17 countries
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